feat(scene): add scene editor, executor and fakes (phase 1)

Introduce the scene module skeleton that satisfies phase 1 exit conditions for
tzh's responsibility in project_plan.md section 6.5: scene list, editor and Fake-driven
execution that can be tested independently.

Domain layer (domain/):
- Scene, SceneAction (SocketPower / InfraredKey), SceneIcon, SceneColor
- SceneExecutionResult with per-action outcome aggregation
- SceneRepository port (observe/get/create/update/delete, provider-isolated)
- SceneExecutor port (sequential execution, per-action failure continues)

Fakes (testing/fakes/):
- FakeSceneRepository: in-memory, provider-isolated, seeds local-experience catalog
- FakeSceneExecutor: drives existing SocketGateway/InfraredGateway fakes,
  rejects concurrent execution of the same scene

Android app (android/app/):
- SceneListScreen / SceneListViewModel: list, empty state, delete confirm
- SceneEditorScreen / SceneEditorViewModel: name/icon/color, action add/remove/reorder
- SceneExecutionScreen / SceneExecutionViewModel: run, progress, per-action summary
- SceneRoutes + NavGraphBuilder extensions wired into ABoxManagerApp
- SceneModule (debug) binds FakeSceneRepository, FakeSceneExecutor and a
  LocalProfileId qualifier that feat/provider-login will retire later

Build (settings.gradle.kts):
- Apply foojay-resolver-convention so the JVM 17 toolchain is auto-provisioned

Resources: zh-rCN / en strings for all scene surfaces
Tests: 20 unit tests covering repository isolation, CRUD, executor ordering,
failure continuation and concurrent-execution rejection

android/app/src/debug/kotlin/com/flagship/abox/manager/di/SceneModule.kt

@@ -0,0 +1,41 @@
+package com.flagship.abox.manager.di
+
+import com.flagship.abox.manager.domain.InfraredGateway
+import com.flagship.abox.manager.domain.ProviderProfileId
+import com.flagship.abox.manager.domain.SceneExecutor
+import com.flagship.abox.manager.domain.SceneRepository
+import com.flagship.abox.manager.domain.SocketGateway
+import com.flagship.abox.manager.testing.fakes.FakeSceneExecutor
+import com.flagship.abox.manager.testing.fakes.FakeSceneRepository
+import com.flagship.abox.manager.ui.scene.LocalProfileId
+import dagger.Module
+import dagger.Provides
+import dagger.hilt.InstallIn
+import dagger.hilt.components.SingletonComponent
+import javax.inject.Singleton
+
+/**
+ * Phase 1 Hilt bindings for the scene module. Binds the in-memory [FakeSceneRepository] and the
+ * [FakeSceneExecutor] that drives the existing socket/infrared fakes. The bindings live in the
+ * debug source set so the release build does not ship the Fake implementation; the real provider
+ * bindings will land in `feat/scene-persistence` and `feat/provider-login` respectively.
+ */
+@Module
+@InstallIn(SingletonComponent::class)
+object SceneModule {
+    @Provides
+    @Singleton
+    fun provideSceneRepository(): SceneRepository = FakeSceneRepository()
+
+    @Provides
+    @Singleton
+    fun provideSceneExecutor(
+        socketGateway: SocketGateway,
+        infraredGateway: InfraredGateway,
+    ): SceneExecutor = FakeSceneExecutor(socketGateway, infraredGateway)
+
+    @Provides
+    @Singleton
+    @LocalProfileId
+    fun provideLocalProfileId(): ProviderProfileId = FakeSceneRepository.localProfile
+}

android/app/src/main/kotlin/com/flagship/abox/manager/ui/scene/LocalProfileId.kt

@@ -0,0 +1,14 @@
+package com.flagship.abox.manager.ui.scene
+
+import javax.inject.Qualifier
+
+/**
+ * Qualifies the [com.flagship.abox.manager.domain.ProviderProfileId] used by the scene module
+ * while the real provider selector is still being built (see project_plan.md §7 dependency graph).
+ *
+ * Phase 2 will replace this binding with the active session's profile id observed from
+ * SessionGateway; the qualifier will be retired at that point.
+ */
+@Qualifier
+@Retention(AnnotationRetention.BINARY)
+annotation class LocalProfileId

android/app/src/main/kotlin/com/flagship/abox/manager/ui/scene/SceneEditorScreen.kt

@@ -0,0 +1,283 @@
+package com.flagship.abox.manager.ui.scene
+
+import androidx.compose.foundation.layout.Arrangement
+import androidx.compose.foundation.layout.Column
+import androidx.compose.foundation.layout.PaddingValues
+import androidx.compose.foundation.layout.Row
+import androidx.compose.foundation.layout.Spacer
+import androidx.compose.foundation.layout.fillMaxSize
+import androidx.compose.foundation.layout.fillMaxWidth
+import androidx.compose.foundation.layout.padding
+import androidx.compose.foundation.layout.size
+import androidx.compose.foundation.lazy.LazyColumn
+import androidx.compose.foundation.lazy.items
+import androidx.compose.foundation.text.KeyboardOptions
+import androidx.compose.material.icons.Icons
+import androidx.compose.material.icons.filled.ArrowBack
+import androidx.compose.material.icons.filled.ArrowDownward
+import androidx.compose.material.icons.filled.ArrowUpward
+import androidx.compose.material.icons.filled.Delete
+import androidx.compose.material3.AssistChip
+import androidx.compose.material3.Button
+import androidx.compose.material3.Card
+import androidx.compose.material3.ExperimentalMaterial3Api
+import androidx.compose.material3.FilterChip
+import androidx.compose.material3.Icon
+import androidx.compose.material3.IconButton
+import androidx.compose.material3.MaterialTheme
+import androidx.compose.material3.OutlinedTextField
+import androidx.compose.material3.Scaffold
+import androidx.compose.material3.Text
+import androidx.compose.material3.TopAppBar
+import androidx.compose.runtime.Composable
+import androidx.compose.runtime.getValue
+import androidx.compose.runtime.mutableStateOf
+import androidx.compose.runtime.remember
+import androidx.compose.runtime.setValue
+import androidx.compose.ui.Alignment
+import androidx.compose.ui.Modifier
+import androidx.compose.ui.res.stringResource
+import androidx.compose.ui.text.input.KeyboardType
+import androidx.compose.ui.unit.dp
+import androidx.hilt.navigation.compose.hiltViewModel
+import androidx.lifecycle.compose.collectAsStateWithLifecycle
+import com.flagship.abox.manager.R
+import com.flagship.abox.manager.domain.SceneAction
+import com.flagship.abox.manager.domain.SceneIcon
+import com.flagship.abox.manager.domain.SocketPowerState
+
+@OptIn(ExperimentalMaterial3Api::class)
+@Composable
+fun SceneEditorScreen(
+    sceneId: com.flagship.abox.manager.domain.SceneId?,
+    onBack: () -> Unit,
+    onSaved: () -> Unit,
+    viewModel: SceneEditorViewModel = hiltViewModel(),
+) {
+    val state by viewModel.state.collectAsStateWithLifecycle()
+
+    androidx.compose.runtime.LaunchedEffect(state.isSaved) {
+        if (state.isSaved) onSaved()
+    }
+    androidx.compose.runtime.LaunchedEffect(sceneId) {
+        viewModel.initialize(sceneId)
+    }
+
+    Scaffold(
+        topBar = {
+            TopAppBar(
+                title = {
+                    Text(
+                        stringResource(
+                            if (state.isEditing) R.string.scene_editor_edit_title
+                            else R.string.scene_editor_new_title,
+                        ),
+                    )
+                },
+                navigationIcon = {
+                    IconButton(onClick = onBack) {
+                        Icon(Icons.Filled.ArrowBack, contentDescription = stringResource(R.string.scene_back))
+                    }
+                },
+            )
+        },
+    ) { innerPadding ->
+        LazyColumn(
+            modifier = Modifier
+                .fillMaxSize()
+                .padding(innerPadding),
+            contentPadding = PaddingValues(16.dp),
+            verticalArrangement = Arrangement.spacedBy(16.dp),
+        ) {
+            item {
+                OutlinedTextField(
+                    value = state.name,
+                    onValueChange = viewModel::updateName,
+                    label = { Text(stringResource(R.string.scene_name_label)) },
+                    singleLine = true,
+                    modifier = Modifier.fillMaxWidth(),
+                )
+            }
+            item {
+                Text(stringResource(R.string.scene_icon_label), style = MaterialTheme.typography.titleSmall)
+                Spacer(Modifier.size(8.dp))
+                Row(horizontalArrangement = Arrangement.spacedBy(8.dp)) {
+                    SceneIcon.entries.forEach { icon ->
+                        FilterChip(
+                            selected = state.icon == icon,
+                            onClick = { viewModel.updateIcon(icon) },
+                            label = { Text(icon.displayLabel()) },
+                        )
+                    }
+                }
+            }
+            item {
+                OutlinedTextField(
+                    value = state.colorHex,
+                    onValueChange = viewModel::updateColor,
+                    label = { Text(stringResource(R.string.scene_color_label)) },
+                    singleLine = true,
+                    keyboardOptions = KeyboardOptions(keyboardType = KeyboardType.Ascii),
+                    modifier = Modifier.fillMaxWidth(),
+                )
+            }
+            item {
+                Text(
+                    stringResource(R.string.scene_actions_label, state.actions.size),
+                    style = MaterialTheme.typography.titleSmall,
+                )
+            }
+            items(state.actions, key = { it.id.value }) { action ->
+                ActionRow(
+                    action = action,
+                    index = state.actions.indexOf(action),
+                    total = state.actions.size,
+                    onMoveUp = { i -> viewModel.moveAction(i, i - 1) },
+                    onMoveDown = { i -> viewModel.moveAction(i, i + 1) },
+                    onRemove = { viewModel.removeAction(action.id) },
+                )
+            }
+            item { AddSocketActionSection(viewModel) }
+            item { AddInfraredActionSection(viewModel) }
+            item {
+                state.errorMessage?.let { Text(it, color = MaterialTheme.colorScheme.error) }
+                Button(
+                    onClick = viewModel::save,
+                    enabled = state.isValid && !state.isSaving,
+                    modifier = Modifier.fillMaxWidth(),
+                ) {
+                    Text(stringResource(R.string.scene_save_action))
+                }
+            }
+        }
+    }
+}
+
+@Composable
+private fun ActionRow(
+    action: SceneAction,
+    index: Int,
+    total: Int,
+    onMoveUp: (Int) -> Unit,
+    onMoveDown: (Int) -> Unit,
+    onRemove: () -> Unit,
+) {
+    Card(modifier = Modifier.fillMaxWidth()) {
+        Row(
+            modifier = Modifier
+                .fillMaxWidth()
+                .padding(12.dp),
+            verticalAlignment = Alignment.CenterVertically,
+        ) {
+            Column(modifier = Modifier.weight(1f)) {
+                Text(
+                    text = when (action) {
+                        is SceneAction.SocketPower -> stringResource(
+                            R.string.scene_action_socket,
+                            action.deviceName.value,
+                            action.powerState.name,
+                        )
+                        is SceneAction.InfraredKey -> stringResource(
+                            R.string.scene_action_infrared,
+                            action.deviceName.value,
+                            action.key,
+                        )
+                    },
+                    style = MaterialTheme.typography.bodyMedium,
+                )
+            }
+            IconButton(onClick = { onMoveUp(index) }, enabled = index > 0) {
+                Icon(Icons.Filled.ArrowUpward, contentDescription = null)
+            }
+            IconButton(onClick = { onMoveDown(index) }, enabled = index < total - 1) {
+                Icon(Icons.Filled.ArrowDownward, contentDescription = null)
+            }
+            IconButton(onClick = onRemove) {
+                Icon(Icons.Filled.Delete, contentDescription = null)
+            }
+        }
+    }
+}
+
+@Composable
+private fun AddSocketActionSection(viewModel: SceneEditorViewModel) {
+    var deviceName by remember { mutableStateOf("") }
+    var powerOn by remember { mutableStateOf(true) }
+
+    Column(verticalArrangement = Arrangement.spacedBy(8.dp)) {
+        Text(
+            stringResource(R.string.scene_add_socket_action),
+            style = MaterialTheme.typography.titleSmall,
+        )
+        OutlinedTextField(
+            value = deviceName,
+            onValueChange = { deviceName = it },
+            label = { Text(stringResource(R.string.scene_device_name_label)) },
+            singleLine = true,
+            modifier = Modifier.fillMaxWidth(),
+        )
+        Row(horizontalArrangement = Arrangement.spacedBy(8.dp)) {
+            SocketPowerState.entries.forEach { state ->
+                FilterChip(
+                    selected = powerOn == (state == SocketPowerState.ON),
+                    onClick = { powerOn = state == SocketPowerState.ON },
+                    label = { Text(state.name) },
+                )
+            }
+        }
+        AssistChip(
+            onClick = {
+                viewModel.addSocketAction(
+                    deviceName,
+                    if (powerOn) SocketPowerState.ON else SocketPowerState.OFF,
+                )
+                deviceName = ""
+            },
+            label = { Text(stringResource(R.string.scene_add_action)) },
+        )
+    }
+}
+
+@Composable
+private fun AddInfraredActionSection(viewModel: SceneEditorViewModel) {
+    var deviceName by remember { mutableStateOf("") }
+    var key by remember { mutableStateOf("") }
+
+    Column(verticalArrangement = Arrangement.spacedBy(8.dp)) {
+        Text(
+            stringResource(R.string.scene_add_infrared_action),
+            style = MaterialTheme.typography.titleSmall,
+        )
+        OutlinedTextField(
+            value = deviceName,
+            onValueChange = { deviceName = it },
+            label = { Text(stringResource(R.string.scene_device_name_label)) },
+            singleLine = true,
+            modifier = Modifier.fillMaxWidth(),
+        )
+        OutlinedTextField(
+            value = key,
+            onValueChange = { key = it },
+            label = { Text(stringResource(R.string.scene_infrared_key_label)) },
+            singleLine = true,
+            modifier = Modifier.fillMaxWidth(),
+        )
+        AssistChip(
+            onClick = {
+                viewModel.addInfraredAction(deviceName, key)
+                deviceName = ""
+                key = ""
+            },
+            label = { Text(stringResource(R.string.scene_add_action)) },
+        )
+    }
+}
+
+private fun SceneIcon.displayLabel(): String = when (this) {
+    SceneIcon.HOME -> "Home"
+    SceneIcon.OFFICE -> "Office"
+    SceneIcon.NIGHT -> "Night"
+    SceneIcon.MOVIE -> "Movie"
+    SceneIcon.AWAY -> "Away"
+    SceneIcon.CUSTOM -> "Custom"
+}

android/app/src/main/kotlin/com/flagship/abox/manager/ui/scene/SceneEditorViewModel.kt

@@ -0,0 +1,136 @@
+package com.flagship.abox.manager.ui.scene
+
+import androidx.lifecycle.ViewModel
+import androidx.lifecycle.viewModelScope
+import com.flagship.abox.manager.domain.DeviceName
+import com.flagship.abox.manager.domain.DomainResult
+import com.flagship.abox.manager.domain.ProviderProfileId
+import com.flagship.abox.manager.domain.Scene
+import com.flagship.abox.manager.domain.SceneAction
+import com.flagship.abox.manager.domain.SceneActionId
+import com.flagship.abox.manager.domain.SceneColor
+import com.flagship.abox.manager.domain.SceneIcon
+import com.flagship.abox.manager.domain.SceneId
+import com.flagship.abox.manager.domain.SceneRepository
+import com.flagship.abox.manager.domain.SocketPowerState
+import dagger.hilt.android.lifecycle.HiltViewModel
+import java.util.UUID
+import javax.inject.Inject
+import kotlinx.coroutines.flow.MutableStateFlow
+import kotlinx.coroutines.flow.StateFlow
+import kotlinx.coroutines.flow.asStateFlow
+import kotlinx.coroutines.flow.update
+import kotlinx.coroutines.launch
+
+data class SceneEditorState(
+    val sceneId: SceneId? = null,
+    val name: String = "",
+    val icon: SceneIcon = SceneIcon.HOME,
+    val colorHex: String = "#FF8A65",
+    val actions: List<SceneAction> = emptyList(),
+    val isSaving: Boolean = false,
+    val isSaved: Boolean = false,
+    val errorMessage: String? = null,
+) {
+    val isValid: Boolean get() = name.isNotBlank() && actions.isNotEmpty()
+    val isEditing: Boolean get() = sceneId != null
+}
+
+@HiltViewModel
+class SceneEditorViewModel @Inject constructor(
+    private val sceneRepository: SceneRepository,
+    @LocalProfileId private val localProfileId: ProviderProfileId,
+) : ViewModel() {
+
+    private val _state = MutableStateFlow(SceneEditorState())
+    val state: StateFlow<SceneEditorState> = _state.asStateFlow()
+
+    fun initialize(sceneId: SceneId?) {
+        if (sceneId == null) {
+            _state.value = SceneEditorState()
+            return
+        }
+        viewModelScope.launch {
+            val scene = (sceneRepository.getScene(localProfileId, sceneId) as? DomainResult.Success)?.value
+            if (scene != null) {
+                _state.value = SceneEditorState(
+                    sceneId = scene.id,
+                    name = scene.name,
+                    icon = scene.icon,
+                    colorHex = scene.color.hex,
+                    actions = scene.actions,
+                )
+            } else {
+                _state.update { it.copy(errorMessage = "Scene not found") }
+            }
+        }
+    }
+
+    fun updateName(name: String) = _state.update { it.copy(name = name, errorMessage = null) }
+
+    fun updateIcon(icon: SceneIcon) = _state.update { it.copy(icon = icon) }
+
+    fun updateColor(hex: String) = _state.update { it.copy(colorHex = hex) }
+
+    fun addSocketAction(deviceName: String, powerState: SocketPowerState) {
+        if (deviceName.isBlank()) return
+        val action = SceneAction.SocketPower(
+            id = SceneActionId(UUID.randomUUID().toString()),
+            profileId = localProfileId,
+            deviceName = DeviceName(deviceName),
+            powerState = powerState,
+        )
+        _state.update { it.copy(actions = it.actions + action, errorMessage = null) }
+    }
+
+    fun addInfraredAction(deviceName: String, key: String) {
+        if (deviceName.isBlank() || key.isBlank()) return
+        val action = SceneAction.InfraredKey(
+            id = SceneActionId(UUID.randomUUID().toString()),
+            profileId = localProfileId,
+            deviceName = DeviceName(deviceName),
+            key = key,
+        )
+        _state.update { it.copy(actions = it.actions + action, errorMessage = null) }
+    }
+
+    fun removeAction(actionId: SceneActionId) =
+        _state.update { it.copy(actions = it.actions.filterNot { a -> a.id == actionId }) }
+
+    fun moveAction(from: Int, to: Int) {
+        val current = _state.value.actions
+        if (from !in current.indices || to !in current.indices || from == to) return
+        val updated = current.toMutableList().apply { add(to, removeAt(from)) }
+        _state.update { it.copy(actions = updated) }
+    }
+
+    fun save() {
+        val state = _state.value
+        if (!state.isValid || state.isSaving) return
+        _state.update { it.copy(isSaving = true, errorMessage = null) }
+        viewModelScope.launch {
+            val scene = Scene(
+                id = state.sceneId ?: SceneId("${localProfileId.value}:scene-${UUID.randomUUID()}"),
+                profileId = localProfileId,
+                name = state.name.trim(),
+                icon = state.icon,
+                color = SceneColor(state.colorHex),
+                actions = state.actions,
+            )
+            val result = if (state.isEditing) {
+                sceneRepository.updateScene(localProfileId, scene)
+            } else {
+                sceneRepository.createScene(localProfileId, scene)
+            }
+            _state.update { current ->
+                when (result) {
+                    is DomainResult.Success -> current.copy(isSaving = false, isSaved = true)
+                    is DomainResult.Failure -> current.copy(
+                        isSaving = false,
+                        errorMessage = result.error.detail ?: "Save failed",
+                    )
+                }
+            }
+        }
+    }
+}

android/app/src/main/kotlin/com/flagship/abox/manager/ui/scene/SceneExecutionScreen.kt

@@ -0,0 +1,221 @@
+package com.flagship.abox.manager.ui.scene
+
+import androidx.compose.foundation.layout.Arrangement
+import androidx.compose.foundation.layout.Column
+import androidx.compose.foundation.layout.PaddingValues
+import androidx.compose.foundation.layout.Row
+import androidx.compose.foundation.layout.Spacer
+import androidx.compose.foundation.layout.fillMaxSize
+import androidx.compose.foundation.layout.fillMaxWidth
+import androidx.compose.foundation.layout.padding
+import androidx.compose.foundation.layout.size
+import androidx.compose.foundation.lazy.LazyColumn
+import androidx.compose.foundation.lazy.items
+import androidx.compose.material.icons.Icons
+import androidx.compose.material.icons.filled.ArrowBack
+import androidx.compose.material.icons.filled.CheckCircle
+import androidx.compose.material.icons.filled.Error
+import androidx.compose.material3.Button
+import androidx.compose.material3.Card
+import androidx.compose.material3.CircularProgressIndicator
+import androidx.compose.material3.ExperimentalMaterial3Api
+import androidx.compose.material3.Icon
+import androidx.compose.material3.IconButton
+import androidx.compose.material3.MaterialTheme
+import androidx.compose.material3.Scaffold
+import androidx.compose.material3.Text
+import androidx.compose.material3.TopAppBar
+import androidx.compose.runtime.Composable
+import androidx.compose.runtime.LaunchedEffect
+import androidx.compose.runtime.getValue
+import androidx.compose.ui.Alignment
+import androidx.compose.ui.Modifier
+import androidx.compose.ui.graphics.Color
+import androidx.compose.ui.res.stringResource
+import androidx.compose.ui.unit.dp
+import androidx.hilt.navigation.compose.hiltViewModel
+import androidx.lifecycle.compose.collectAsStateWithLifecycle
+import com.flagship.abox.manager.R
+import com.flagship.abox.manager.domain.SceneAction
+import com.flagship.abox.manager.domain.SceneActionExecutionResult
+import com.flagship.abox.manager.domain.SceneActionOutcome
+
+@OptIn(ExperimentalMaterial3Api::class)
+@Composable
+fun SceneExecutionScreen(
+    sceneId: com.flagship.abox.manager.domain.SceneId,
+    onBack: () -> Unit,
+    viewModel: SceneExecutionViewModel = hiltViewModel(),
+) {
+    val uiState by viewModel.uiState.collectAsStateWithLifecycle()
+    LaunchedEffect(sceneId) { viewModel.initialize(sceneId) }
+
+    Scaffold(
+        topBar = {
+            TopAppBar(
+                title = { Text(stringResource(R.string.scene_execution_title)) },
+                navigationIcon = {
+                    IconButton(onClick = onBack) {
+                        Icon(Icons.Filled.ArrowBack, contentDescription = stringResource(R.string.scene_back))
+                    }
+                },
+            )
+        },
+    ) { innerPadding ->
+        when (val state = uiState) {
+            SceneExecutionUiState.Loading -> CenteredLoading(innerPadding)
+            is SceneExecutionUiState.Failed -> CenteredMessage(innerPadding, state.message)
+            is SceneExecutionUiState.Ready -> ReadyContent(innerPadding, state.scene.name, viewModel::execute)
+            is SceneExecutionUiState.Running -> RunningContent(innerPadding, state.scene.name)
+            is SceneExecutionUiState.Completed -> CompletedContent(innerPadding, state.result, onBack)
+        }
+    }
+}
+
+@Composable
+private fun CenteredLoading(paddingValues: PaddingValues) {
+    Row(
+        modifier = Modifier
+            .fillMaxSize()
+            .padding(paddingValues),
+        horizontalArrangement = Arrangement.Center,
+        verticalAlignment = Alignment.CenterVertically,
+    ) {
+        CircularProgressIndicator()
+    }
+}
+
+@Composable
+private fun CenteredMessage(paddingValues: PaddingValues, message: String) {
+    Column(
+        modifier = Modifier
+            .fillMaxSize()
+            .padding(paddingValues)
+            .padding(32.dp),
+        horizontalAlignment = Alignment.CenterHorizontally,
+        verticalArrangement = Arrangement.Center,
+    ) {
+        Text(message, style = MaterialTheme.typography.bodyLarge, color = MaterialTheme.colorScheme.error)
+    }
+}
+
+@Composable
+private fun ReadyContent(
+    paddingValues: PaddingValues,
+    sceneName: String,
+    onExecute: () -> Unit,
+) {
+    Column(
+        modifier = Modifier
+            .fillMaxSize()
+            .padding(paddingValues)
+            .padding(24.dp),
+        horizontalAlignment = Alignment.CenterHorizontally,
+        verticalArrangement = Arrangement.Center,
+    ) {
+        Text(sceneName, style = MaterialTheme.typography.headlineSmall)
+        Spacer(Modifier.size(24.dp))
+        Button(onClick = onExecute) {
+            Text(stringResource(R.string.scene_execution_run))
+        }
+    }
+}
+
+@Composable
+private fun RunningContent(paddingValues: PaddingValues, sceneName: String) {
+    Column(
+        modifier = Modifier
+            .fillMaxSize()
+            .padding(paddingValues)
+            .padding(24.dp),
+        horizontalAlignment = Alignment.CenterHorizontally,
+        verticalArrangement = Arrangement.Center,
+    ) {
+        CircularProgressIndicator()
+        Spacer(Modifier.size(16.dp))
+        Text(
+            stringResource(R.string.scene_execution_running, sceneName),
+            style = MaterialTheme.typography.bodyLarge,
+        )
+    }
+}
+
+@Composable
+private fun CompletedContent(
+    paddingValues: PaddingValues,
+    result: com.flagship.abox.manager.domain.SceneExecutionResult,
+    onBack: () -> Unit,
+) {
+    LazyColumn(
+        modifier = Modifier
+            .fillMaxSize()
+            .padding(paddingValues),
+        contentPadding = PaddingValues(16.dp),
+        verticalArrangement = Arrangement.spacedBy(12.dp),
+    ) {
+        item {
+            Text(
+                text = stringResource(
+                    R.string.scene_execution_summary,
+                    result.succeededCount,
+                    result.failedCount,
+                    result.totalActions,
+                ),
+                style = MaterialTheme.typography.titleMedium,
+            )
+        }
+        items(result.results, key = { it.action.id.value }) { entry ->
+            ActionResultRow(entry)
+        }
+        item {
+            Button(onClick = onBack, modifier = Modifier.fillMaxWidth()) {
+                Text(stringResource(R.string.scene_execution_done))
+            }
+        }
+    }
+}
+
+@Composable
+private fun ActionResultRow(entry: SceneActionExecutionResult) {
+    Card(modifier = Modifier.fillMaxWidth()) {
+        Row(
+            modifier = Modifier
+                .fillMaxWidth()
+                .padding(12.dp),
+            verticalAlignment = Alignment.CenterVertically,
+        ) {
+            Icon(
+                imageVector = if (entry.outcome == SceneActionOutcome.SUCCESS) {
+                    Icons.Filled.CheckCircle
+                } else {
+                    Icons.Filled.Error
+                },
+                contentDescription = null,
+                tint = if (entry.outcome == SceneActionOutcome.SUCCESS) {
+                    MaterialTheme.colorScheme.primary
+                } else {
+                    MaterialTheme.colorScheme.error
+                },
+            )
+            Spacer(Modifier.size(12.dp))
+            Column(modifier = Modifier.weight(1f)) {
+                Text(
+                    text = entry.action.describe(),
+                    style = MaterialTheme.typography.bodyMedium,
+                )
+                entry.error?.detail?.let { detail ->
+                    Text(
+                        text = detail,
+                        style = MaterialTheme.typography.bodySmall,
+                        color = MaterialTheme.colorScheme.error,
+                    )
+                }
+            }
+        }
+    }
+}
+
+private fun SceneAction.describe(): String = when (this) {
+    is SceneAction.SocketPower -> "Socket ${deviceName.value} -> ${powerState.name}"
+    is SceneAction.InfraredKey -> "Infrared ${deviceName.value} -> $key"
+}

android/app/src/main/kotlin/com/flagship/abox/manager/ui/scene/SceneExecutionViewModel.kt

@@ -0,0 +1,64 @@
+package com.flagship.abox.manager.ui.scene
+
+import androidx.lifecycle.ViewModel
+import androidx.lifecycle.viewModelScope
+import com.flagship.abox.manager.domain.DomainResult
+import com.flagship.abox.manager.domain.ProviderProfileId
+import com.flagship.abox.manager.domain.Scene
+import com.flagship.abox.manager.domain.SceneExecutionResult
+import com.flagship.abox.manager.domain.SceneExecutor
+import com.flagship.abox.manager.domain.SceneId
+import com.flagship.abox.manager.domain.SceneRepository
+import dagger.hilt.android.lifecycle.HiltViewModel
+import javax.inject.Inject
+import kotlinx.coroutines.flow.MutableStateFlow
+import kotlinx.coroutines.flow.StateFlow
+import kotlinx.coroutines.flow.asStateFlow
+import kotlinx.coroutines.launch
+
+sealed interface SceneExecutionUiState {
+    data object Loading : SceneExecutionUiState
+    data class Ready(val scene: Scene) : SceneExecutionUiState
+    data class Running(val scene: Scene) : SceneExecutionUiState
+    data class Completed(val result: SceneExecutionResult) : SceneExecutionUiState
+    data class Failed(val message: String) : SceneExecutionUiState
+}
+
+@HiltViewModel
+class SceneExecutionViewModel @Inject constructor(
+    private val sceneRepository: SceneRepository,
+    private val sceneExecutor: SceneExecutor,
+    @LocalProfileId private val localProfileId: ProviderProfileId,
+) : ViewModel() {
+
+    private val _uiState = MutableStateFlow<SceneExecutionUiState>(SceneExecutionUiState.Loading)
+    val uiState: StateFlow<SceneExecutionUiState> = _uiState.asStateFlow()
+
+    fun initialize(sceneId: SceneId) {
+        _uiState.value = SceneExecutionUiState.Loading
+        viewModelScope.launch {
+            val scene = (sceneRepository.getScene(localProfileId, sceneId) as? DomainResult.Success)?.value
+            _uiState.value = if (scene != null) {
+                SceneExecutionUiState.Ready(scene)
+            } else {
+                SceneExecutionUiState.Failed("Scene not found")
+            }
+        }
+    }
+
+    fun execute() {
+        val current = _uiState.value
+        val scene = (current as? SceneExecutionUiState.Ready)?.scene
+            ?: (current as? SceneExecutionUiState.Running)?.scene
+            ?: return
+        _uiState.value = SceneExecutionUiState.Running(scene)
+        viewModelScope.launch {
+            when (val result = sceneExecutor.execute(scene)) {
+                is DomainResult.Success -> _uiState.value = SceneExecutionUiState.Completed(result.value)
+                is DomainResult.Failure -> _uiState.value = SceneExecutionUiState.Failed(
+                    result.error.detail ?: "Execution failed",
+                )
+            }
+        }
+    }
+}

android/app/src/main/kotlin/com/flagship/abox/manager/ui/scene/SceneListScreen.kt

@@ -0,0 +1,195 @@
+package com.flagship.abox.manager.ui.scene
+
+import androidx.compose.foundation.background
+import androidx.compose.foundation.clickable
+import androidx.compose.foundation.layout.Arrangement
+import androidx.compose.foundation.layout.Box
+import androidx.compose.foundation.layout.Column
+import androidx.compose.foundation.layout.PaddingValues
+import androidx.compose.foundation.layout.Row
+import androidx.compose.foundation.layout.Spacer
+import androidx.compose.foundation.layout.fillMaxSize
+import androidx.compose.foundation.layout.fillMaxWidth
+import androidx.compose.foundation.layout.padding
+import androidx.compose.foundation.layout.size
+import androidx.compose.foundation.layout.width
+import androidx.compose.foundation.lazy.LazyColumn
+import androidx.compose.foundation.lazy.items
+import androidx.compose.foundation.shape.CircleShape
+import androidx.compose.material.icons.Icons
+import androidx.compose.material.icons.filled.Add
+import androidx.compose.material.icons.filled.Delete
+import androidx.compose.material.icons.filled.PlayArrow
+import androidx.compose.material3.AlertDialog
+import androidx.compose.material3.Card
+import androidx.compose.material3.ExtendedFloatingActionButton
+import androidx.compose.material3.Icon
+import androidx.compose.material3.IconButton
+import androidx.compose.material3.MaterialTheme
+import androidx.compose.material3.Scaffold
+import androidx.compose.material3.Text
+import androidx.compose.material3.TextButton
+import androidx.compose.material3.TopAppBar
+import androidx.compose.runtime.Composable
+import androidx.compose.runtime.getValue
+import androidx.compose.ui.Alignment
+import androidx.compose.ui.Modifier
+import androidx.compose.ui.graphics.Color
+import androidx.compose.ui.res.stringResource
+import androidx.compose.ui.text.style.TextAlign
+import androidx.compose.ui.unit.dp
+import androidx.hilt.navigation.compose.hiltViewModel
+import androidx.lifecycle.compose.collectAsStateWithLifecycle
+import com.flagship.abox.manager.R
+import com.flagship.abox.manager.domain.Scene
+import com.flagship.abox.manager.domain.SceneId
+
+@Composable
+fun SceneListScreen(
+    onAddScene: () -> Unit,
+    onEditScene: (SceneId) -> Unit,
+    onExecuteScene: (SceneId) -> Unit,
+    viewModel: SceneListViewModel = hiltViewModel(),
+) {
+    val scenes by viewModel.scenes.collectAsStateWithLifecycle()
+    val pendingDelete by viewModel.pendingDelete.collectAsStateWithLifecycle()
+
+    Scaffold(
+        topBar = {
+            TopAppBar(
+                title = { Text(stringResource(R.string.scene_list_title)) },
+            )
+        },
+        floatingActionButton = {
+            ExtendedFloatingActionButton(
+                onClick = onAddScene,
+                icon = { Icon(Icons.Filled.Add, contentDescription = null) },
+                text = { Text(stringResource(R.string.scene_create_action)) },
+            )
+        },
+    ) { innerPadding ->
+        if (scenes.isEmpty()) {
+            EmptySceneList(modifier = Modifier.padding(innerPadding))
+        } else {
+            LazyColumn(
+                modifier = Modifier.fillMaxSize(),
+                contentPadding = PaddingValues(
+                    start = 16.dp,
+                    end = 16.dp,
+                    top = innerPadding.calculateTopPadding(),
+                    bottom = innerPadding.calculateBottomPadding() + 80.dp,
+                ),
+                verticalArrangement = Arrangement.spacedBy(12.dp),
+            ) {
+                items(scenes, key = { it.id.value }) { scene ->
+                    SceneRow(
+                        scene = scene,
+                        onClick = { onExecuteScene(scene.id) },
+                        onEdit = { onEditScene(scene.id) },
+                        onDelete = { viewModel.markPendingDelete(scene.id) },
+                    )
+                }
+            }
+        }
+    }
+
+    pendingDelete?.let { sceneId ->
+        AlertDialog(
+            onDismissRequest = viewModel::cancelDelete,
+            title = { Text(stringResource(R.string.scene_delete_dialog_title)) },
+            text = { Text(stringResource(R.string.scene_delete_dialog_message)) },
+            confirmButton = {
+                TextButton(onClick = { viewModel.deleteScene(sceneId) }) {
+                    Text(stringResource(R.string.scene_delete_confirm))
+                }
+            },
+            dismissButton = {
+                TextButton(onClick = viewModel::cancelDelete) {
+                    Text(stringResource(R.string.scene_delete_cancel))
+                }
+            },
+        )
+    }
+}
+
+@Composable
+private fun SceneRow(
+    scene: Scene,
+    onClick: () -> Unit,
+    onEdit: () -> Unit,
+    onDelete: () -> Unit,
+) {
+    Card(modifier = Modifier.fillMaxWidth()) {
+        Row(
+            modifier = Modifier
+                .clickable(onClick = onClick)
+                .padding(16.dp),
+            verticalAlignment = Alignment.CenterVertically,
+        ) {
+            Box(
+                modifier = Modifier
+                    .size(40.dp)
+                    .background(
+                        color = scene.color.toColorOrNull() ?: MaterialTheme.colorScheme.primary,
+                        shape = CircleShape,
+                    ),
+            )
+            Spacer(Modifier.width(16.dp))
+            Column(modifier = Modifier.weight(1f)) {
+                Text(
+                    text = scene.name,
+                    style = MaterialTheme.typography.titleMedium,
+                )
+                Text(
+                    text = stringResource(
+                        R.string.scene_action_count,
+                        scene.actions.size,
+                    ),
+                    style = MaterialTheme.typography.bodySmall,
+                    color = MaterialTheme.colorScheme.onSurfaceVariant,
+                )
+            }
+            IconButton(onClick = onEdit) {
+                Icon(
+                    Icons.Filled.PlayArrow,
+                    contentDescription = stringResource(R.string.scene_edit),
+                )
+            }
+            IconButton(onClick = onDelete) {
+                Icon(
+                    Icons.Filled.Delete,
+                    contentDescription = stringResource(R.string.scene_delete),
+                )
+            }
+        }
+    }
+}
+
+@Composable
+private fun EmptySceneList(modifier: Modifier = Modifier) {
+    Column(
+        modifier = modifier
+            .fillMaxSize()
+            .padding(32.dp),
+        horizontalAlignment = Alignment.CenterHorizontally,
+        verticalArrangement = Arrangement.Center,
+    ) {
+        Text(
+            text = stringResource(R.string.scene_empty_title),
+            style = MaterialTheme.typography.titleLarge,
+            textAlign = TextAlign.Center,
+        )
+        Spacer(Modifier.size(12.dp))
+        Text(
+            text = stringResource(R.string.scene_empty_message),
+            style = MaterialTheme.typography.bodyMedium,
+            textAlign = TextAlign.Center,
+            color = MaterialTheme.colorScheme.onSurfaceVariant,
+        )
+    }
+}
+
+internal fun com.flagship.abox.manager.domain.SceneColor.toColorOrNull(): Color? {
+    val hex = value.removePrefix("#")
+    return runCatching { Color(hex.toLong(16) or 0xFF000000.toInt().toLong()) }.getOrNull()
+}

android/app/src/main/kotlin/com/flagship/abox/manager/ui/scene/SceneListViewModel.kt

@@ -0,0 +1,59 @@
+package com.flagship.abox.manager.ui.scene
+
+import androidx.lifecycle.ViewModel
+import androidx.lifecycle.viewModelScope
+import com.flagship.abox.manager.domain.DomainResult
+import com.flagship.abox.manager.domain.ProviderProfileId
+import com.flagship.abox.manager.domain.Scene
+import com.flagship.abox.manager.domain.SceneId
+import com.flagship.abox.manager.domain.SceneRepository
+import dagger.hilt.android.lifecycle.HiltViewModel
+import javax.inject.Inject
+import kotlinx.coroutines.flow.MutableStateFlow
+import kotlinx.coroutines.flow.SharingStarted
+import kotlinx.coroutines.flow.StateFlow
+import kotlinx.coroutines.flow.asStateFlow
+import kotlinx.coroutines.flow.map
+import kotlinx.coroutines.flow.stateIn
+import kotlinx.coroutines.launch
+
+/**
+ * Phase 1 scene list state. The repository is observed for the local-experience profile so the
+ * UI updates when scenes are added, edited or deleted from any screen.
+ *
+ * Phase 2 will replace the hard-coded [LocalProfileId] injection with the active session observed
+ * from SessionGateway (see project_plan.md §6.5 and §7).
+ */
+@HiltViewModel
+class SceneListViewModel @Inject constructor(
+    private val sceneRepository: SceneRepository,
+    @LocalProfileId private val localProfileId: ProviderProfileId,
+) : ViewModel() {
+
+    val scenes: StateFlow<List<Scene>> = sceneRepository
+        .observeScenes(localProfileId)
+        .map { result -> (result as? DomainResult.Success)?.value.orEmpty() }
+        .stateIn(
+            scope = viewModelScope,
+            started = SharingStarted.WhileSubscribed(5_000),
+            initialValue = emptyList(),
+        )
+
+    private val _pendingDelete = MutableStateFlow<SceneId?>(null)
+    val pendingDelete: StateFlow<SceneId?> = _pendingDelete.asStateFlow()
+
+    fun deleteScene(sceneId: SceneId) {
+        viewModelScope.launch {
+            sceneRepository.deleteScene(localProfileId, sceneId)
+            _pendingDelete.value = null
+        }
+    }
+
+    fun cancelDelete() {
+        _pendingDelete.value = null
+    }
+
+    fun markPendingDelete(sceneId: SceneId) {
+        _pendingDelete.value = sceneId
+    }
+}

android/app/src/main/kotlin/com/flagship/abox/manager/ui/scene/SceneNavigation.kt

@@ -0,0 +1,72 @@
+package com.flagship.abox.manager.ui.scene
+
+import androidx.navigation.NavGraphBuilder
+import androidx.navigation.NavType
+import androidx.navigation.compose.composable
+import androidx.navigation.navArgument
+import com.flagship.abox.manager.domain.SceneId
+
+/**
+ * Scene navigation routes. [SceneListRoute] is the entry point; the editor and execution routes
+ * carry the scene id as a path segment so deep linking works without manual argument parsing.
+ */
+object SceneRoutes {
+    const val LIST = "scene/list"
+    const val EDITOR = "scene/editor"
+    const val EDITOR_WITH_ID = "scene/editor/{sceneId}"
+    const val EXECUTION = "scene/execution/{sceneId}"
+
+    fun editorFor(sceneId: SceneId): String = "scene/editor/${sceneId.value}"
+    fun executionFor(sceneId: SceneId): String = "scene/execution/${sceneId.value}"
+}
+
+fun NavGraphBuilder.sceneListDestination(
+    onAddScene: () -> Unit,
+    onEditScene: (SceneId) -> Unit,
+    onExecuteScene: (SceneId) -> Unit,
+) {
+    composable(SceneRoutes.LIST) {
+        SceneListScreen(
+            onAddScene = onAddScene,
+            onEditScene = onEditScene,
+            onExecuteScene = onExecuteScene,
+        )
+    }
+}
+
+fun NavGraphBuilder.sceneEditorDestination(
+    onBack: () -> Unit,
+    onSaved: () -> Unit,
+) {
+    composable(
+        route = SceneRoutes.EDITOR,
+    ) {
+        SceneEditorScreen(sceneId = null, onBack = onBack, onSaved = onSaved)
+    }
+    composable(
+        route = SceneRoutes.EDITOR_WITH_ID,
+        arguments = listOf(navArgument("sceneId") { type = NavType.StringType }),
+    ) { backStackEntry ->
+        val id = backStackEntry.arguments?.getString("sceneId")
+        SceneEditorScreen(
+            sceneId = id?.let { SceneId(it) },
+            onBack = onBack,
+            onSaved = onSaved,
+        )
+    }
+}
+
+fun NavGraphBuilder.sceneExecutionDestination(
+    onBack: () -> Unit,
+) {
+    composable(
+        route = SceneRoutes.EXECUTION,
+        arguments = listOf(navArgument("sceneId") { type = NavType.StringType }),
+    ) { backStackEntry ->
+        val id = backStackEntry.arguments?.getString("sceneId")
+        SceneExecutionScreen(
+            sceneId = SceneId(requireNotNull(id) { "sceneId argument is required" }),
+            onBack = onBack,
+        )
+    }
+}

android/app/src/main/res/values-zh-rCN/strings.xml

@@ -42,4 +42,43 @@
     <string name="scenes_placeholder_description">情景动作与执行插槽（由 tzh 模块实现）。</string>
     <string name="activity_placeholder_title">活动记录</string>
     <string name="activity_placeholder_description">未记录任何事件。</string>
+
+    <!-- Scene: list -->
+    <string name="scene_list_title">情景模式</string>
+    <string name="scene_create_action">新建情景</string>
+    <string name="scene_action_count">%1$d 个动作</string>
+    <string name="scene_edit">编辑情景</string>
+    <string name="scene_delete">删除情景</string>
+    <string name="scene_empty_title">还没有情景</string>
+    <string name="scene_empty_message">新建第一个情景，组合插座和红外动作。</string>
+
+    <!-- Scene: delete dialog -->
+    <string name="scene_delete_dialog_title">删除情景</string>
+    <string name="scene_delete_dialog_message">此操作无法撤销。</string>
+    <string name="scene_delete_confirm">删除</string>
+    <string name="scene_delete_cancel">取消</string>
+
+    <!-- Scene: editor -->
+    <string name="scene_editor_new_title">新建情景</string>
+    <string name="scene_editor_edit_title">编辑情景</string>
+    <string name="scene_back">返回</string>
+    <string name="scene_name_label">名称</string>
+    <string name="scene_icon_label">图标</string>
+    <string name="scene_color_label">主题色（十六进制）</string>
+    <string name="scene_actions_label">动作（%1$d）</string>
+    <string name="scene_add_socket_action">添加插座动作</string>
+    <string name="scene_add_infrared_action">添加红外动作</string>
+    <string name="scene_device_name_label">设备名称</string>
+    <string name="scene_infrared_key_label">红外按键</string>
+    <string name="scene_add_action">添加</string>
+    <string name="scene_save_action">保存情景</string>
+    <string name="scene_action_socket">插座 %1$s -&gt; %2$s</string>
+    <string name="scene_action_infrared">红外 %1$s -&gt; %2$s</string>
+
+    <!-- Scene: execution -->
+    <string name="scene_execution_title">执行情景</string>
+    <string name="scene_execution_run">执行</string>
+    <string name="scene_execution_running">正在执行 %1$s…</string>
+    <string name="scene_execution_summary">%3$d 个动作中成功 %1$d 个，失败 %2$d 个</string>
+    <string name="scene_execution_done">完成</string>
 </resources>

android/app/src/main/res/values/strings.xml

@@ -42,4 +42,43 @@
     <string name="scenes_placeholder_description">Scene actions and execution slot for tzh.</string>
     <string name="activity_placeholder_title">Activity Log</string>
     <string name="activity_placeholder_description">No recorded events yet.</string>
+
+    <!-- Scene: list -->
+    <string name="scene_list_title">Scenes</string>
+    <string name="scene_create_action">New scene</string>
+    <string name="scene_action_count">%1$d actions</string>
+    <string name="scene_edit">Edit scene</string>
+    <string name="scene_delete">Delete scene</string>
+    <string name="scene_empty_title">No scenes yet</string>
+    <string name="scene_empty_message">Create your first scene to combine socket and infrared actions.</string>
+
+    <!-- Scene: delete dialog -->
+    <string name="scene_delete_dialog_title">Delete scene</string>
+    <string name="scene_delete_dialog_message">This action cannot be undone.</string>
+    <string name="scene_delete_confirm">Delete</string>
+    <string name="scene_delete_cancel">Cancel</string>
+
+    <!-- Scene: editor -->
+    <string name="scene_editor_new_title">New scene</string>
+    <string name="scene_editor_edit_title">Edit scene</string>
+    <string name="scene_back">Back</string>
+    <string name="scene_name_label">Name</string>
+    <string name="scene_icon_label">Icon</string>
+    <string name="scene_color_label">Accent color (hex)</string>
+    <string name="scene_actions_label">Actions (%1$d)</string>
+    <string name="scene_add_socket_action">Add socket action</string>
+    <string name="scene_add_infrared_action">Add infrared action</string>
+    <string name="scene_device_name_label">Device name</string>
+    <string name="scene_infrared_key_label">Infrared key</string>
+    <string name="scene_add_action">Add</string>
+    <string name="scene_save_action">Save scene</string>
+    <string name="scene_action_socket">Socket %1$s -> %2$s</string>
+    <string name="scene_action_infrared">Infrared %1$s -> %2$s</string>
+
+    <!-- Scene: execution -->
+    <string name="scene_execution_title">Run scene</string>
+    <string name="scene_execution_run">Run</string>
+    <string name="scene_execution_running">Running %1$s…</string>
+    <string name="scene_execution_summary">%1$d succeeded, %2$d failed of %3$d actions</string>
+    <string name="scene_execution_done">Done</string>
 </resources>

domain/src/main/kotlin/com/flagship/abox/manager/domain/Scene.kt

@@ -0,0 +1,78 @@
+package com.flagship.abox.manager.domain
+
+@JvmInline
+value class SceneId(val value: String)
+
+@JvmInline
+value class SceneActionId(val value: String)
+
+enum class SceneActionType {
+    SOCKET_POWER,
+    INFRARED_KEY,
+}
+
+/**
+ * A single executable step inside a [Scene].
+ *
+ * Socket actions reference the [DeviceName] accepted by ABSDK 0630 and a target [SocketPowerState].
+ * Infrared actions reference a [DeviceName] and the stable key string provided by the infrared
+ * module; the executor delegates the actual send to [InfraredGateway.sendKey].
+ *
+ * `DeviceName` is used (rather than `DeviceId`) because ABSDK addresses devices by name, matching
+ * the existing [SocketGateway] and [InfraredGateway] contracts. The infrared module is responsible
+ * for keeping the key string stable across edits, so scenes can reference it without coupling to
+ * the infrared storage primary key.
+ */
+sealed interface SceneAction {
+    val id: SceneActionId
+    val profileId: ProviderProfileId
+    val deviceName: DeviceName
+    val type: SceneActionType
+
+    data class SocketPower(
+        override val id: SceneActionId,
+        override val profileId: ProviderProfileId,
+        override val deviceName: DeviceName,
+        val powerState: SocketPowerState,
+    ) : SceneAction {
+        override val type: SceneActionType get() = SceneActionType.SOCKET_POWER
+    }
+
+    data class InfraredKey(
+        override val id: SceneActionId,
+        override val profileId: ProviderProfileId,
+        override val deviceName: DeviceName,
+        val key: String,
+    ) : SceneAction {
+        override val type: SceneActionType get() = SceneActionType.INFRARED_KEY
+    }
+}
+
+/**
+ * Visual identity for a scene. Kept as a small enum so the UI can resolve the icon without
+ * external resources and so the persistence layer stays stable across icon set changes.
+ */
+enum class SceneIcon {
+    HOME,
+    OFFICE,
+    NIGHT,
+    MOVIE,
+    AWAY,
+    CUSTOM,
+}
+
+/**
+ * Scene accent color stored as an uppercase hex string (e.g. `#FF8A65`). The UI maps it to the
+ * Compose color space; persistence stores it verbatim.
+ */
+@JvmInline
+value class SceneColor(val hex: String)
+
+data class Scene(
+    val id: SceneId,
+    val profileId: ProviderProfileId,
+    val name: String,
+    val icon: SceneIcon,
+    val color: SceneColor,
+    val actions: List<SceneAction>,
+)

domain/src/main/kotlin/com/flagship/abox/manager/domain/SceneExecution.kt

@@ -0,0 +1,32 @@
+package com.flagship.abox.manager.domain
+
+enum class SceneActionOutcome {
+    SUCCESS,
+    FAILURE,
+}
+
+/**
+ * Result of executing a single [SceneAction]. [error] is non-null when [outcome] is [FAILURE].
+ */
+data class SceneActionExecutionResult(
+    val action: SceneAction,
+    val outcome: SceneActionOutcome,
+    val error: DomainError?,
+)
+
+/**
+ * Aggregated result of executing a [Scene]. Actions are executed sequentially in the order they
+ * appear in [scene.actions]; a per-action failure does not abort subsequent actions.
+ */
+data class SceneExecutionResult(
+    val scene: Scene,
+    val results: List<SceneActionExecutionResult>,
+) {
+    val totalActions: Int get() = results.size
+    val succeededCount: Int
+        get() = results.count { it.outcome == SceneActionOutcome.SUCCESS }
+    val failedCount: Int
+        get() = results.count { it.outcome == SceneActionOutcome.FAILURE }
+    val allSucceeded: Boolean
+        get() = results.isNotEmpty() && failedCount == 0
+}

domain/src/main/kotlin/com/flagship/abox/manager/domain/SceneExecutor.kt

@@ -0,0 +1,12 @@
+package com.flagship.abox.manager.domain
+
+/**
+ * Executes a [Scene] sequentially. Per-action failures are recorded but do not abort subsequent
+ * actions; callers receive a [SceneExecutionResult] that summarizes every step.
+ *
+ * Implementations must be idempotent from the caller's perspective: triggering a scene that is
+ * already running returns [DomainError.OperationFailed] rather than starting a second pass.
+ */
+interface SceneExecutor {
+    suspend fun execute(scene: Scene): DomainResult<SceneExecutionResult>
+}

domain/src/main/kotlin/com/flagship/abox/manager/domain/SceneRepository.kt

@@ -0,0 +1,34 @@
+package com.flagship.abox.manager.domain
+
+import kotlinx.coroutines.flow.Flow
+
+/**
+ * Owns the scene catalog for every provider profile. Implementations must isolate data by
+ * [ProviderProfileId]: scenes, actions and identifiers must not leak across profiles.
+ *
+ * This port is intentionally persistence-agnostic. The first PR provides an in-memory Fake
+ * implementation; Room persistence will land in a follow-up `feat/scene-persistence` branch.
+ */
+interface SceneRepository {
+    fun observeScenes(profileId: ProviderProfileId): Flow<DomainResult<List<Scene>>>
+
+    suspend fun getScene(
+        profileId: ProviderProfileId,
+        sceneId: SceneId,
+    ): DomainResult<Scene?>
+
+    suspend fun createScene(
+        profileId: ProviderProfileId,
+        scene: Scene,
+    ): DomainResult<Scene>
+
+    suspend fun updateScene(
+        profileId: ProviderProfileId,
+        scene: Scene,
+    ): DomainResult<Scene>
+
+    suspend fun deleteScene(
+        profileId: ProviderProfileId,
+        sceneId: SceneId,
+    ): DomainResult<Unit>
+}

settings.gradle.kts

@@ -12,6 +12,10 @@ pluginManagement {
     }
 }
 
+plugins {
+    id("org.gradle.toolchains.foojay-resolver-convention") version "0.8.0"
+}
+
 dependencyResolutionManagement {
     repositoriesMode.set(RepositoriesMode.FAIL_ON_PROJECT_REPOS)
     repositories {

testing/fakes/src/main/kotlin/com/flagship/abox/manager/testing/fakes/FakeSceneRepository.kt

@@ -0,0 +1,245 @@
+package com.flagship.abox.manager.testing.fakes
+
+import com.flagship.abox.manager.domain.DeviceName
+import com.flagship.abox.manager.domain.DomainError
+import com.flagship.abox.manager.domain.DomainResult
+import com.flagship.abox.manager.domain.InfraredGateway
+import com.flagship.abox.manager.domain.ProviderProfileId
+import com.flagship.abox.manager.domain.Scene
+import com.flagship.abox.manager.domain.SceneAction
+import com.flagship.abox.manager.domain.SceneActionExecutionResult
+import com.flagship.abox.manager.domain.SceneActionId
+import com.flagship.abox.manager.domain.SceneActionOutcome
+import com.flagship.abox.manager.domain.SceneColor
+import com.flagship.abox.manager.domain.SceneExecutionResult
+import com.flagship.abox.manager.domain.SceneExecutor
+import com.flagship.abox.manager.domain.SceneIcon
+import com.flagship.abox.manager.domain.SceneId
+import com.flagship.abox.manager.domain.SceneRepository
+import com.flagship.abox.manager.domain.SocketGateway
+import com.flagship.abox.manager.domain.SocketPowerState
+import kotlinx.coroutines.flow.Flow
+import kotlinx.coroutines.flow.MutableStateFlow
+import java.util.concurrent.ConcurrentHashMap
+
+/**
+ * In-memory [SceneRepository] used by the scene UI and ViewModel tests. Scenes are isolated by
+ * [ProviderProfileId]; mutating scenes for one profile never touches another profile's flow.
+ *
+ * The repository is intentionally deterministic: [defaultScenes] seeds the same catalog every
+ * run so UI snapshots and tests stay stable. Mutations emit a new list through the profile's
+ * StateFlow.
+ */
+class FakeSceneRepository : SceneRepository {
+    private val flows = ConcurrentHashMap<
+        ProviderProfileId,
+        MutableStateFlow<DomainResult<List<Scene>>>,
+    >()
+
+    override fun observeScenes(
+        profileId: ProviderProfileId,
+    ): Flow<DomainResult<List<Scene>>> = flowFor(profileId)
+
+    override suspend fun getScene(
+        profileId: ProviderProfileId,
+        sceneId: SceneId,
+    ): DomainResult<Scene?> {
+        val scenes = currentScenes(profileId) ?: return notFound(sceneId)
+        return DomainResult.Success(scenes.firstOrNull { it.id == sceneId })
+    }
+
+    override suspend fun createScene(
+        profileId: ProviderProfileId,
+        scene: Scene,
+    ): DomainResult<Scene> {
+        require(scene.profileId == profileId) {
+            "Scene profileId must match the supplied profileId"
+        }
+        val scenes = currentScenes(profileId).orEmpty()
+        if (scenes.any { it.id == scene.id }) {
+            return DomainResult.Failure(
+                DomainError.InvalidRequest(
+                    detail = "Scene id ${scene.id.value} already exists in profile ${profileId.value}",
+                ),
+            )
+        }
+        val updated = scenes + scene
+        publish(profileId, updated)
+        return DomainResult.Success(scene)
+    }
+
+    override suspend fun updateScene(
+        profileId: ProviderProfileId,
+        scene: Scene,
+    ): DomainResult<Scene> {
+        require(scene.profileId == profileId) {
+            "Scene profileId must match the supplied profileId"
+        }
+        val scenes = currentScenes(profileId).orEmpty()
+        val index = scenes.indexOfFirst { it.id == scene.id }
+        if (index < 0) return notFound(scene.id)
+        val updated = scenes.toMutableList().apply { set(index, scene) }
+        publish(profileId, updated)
+        return DomainResult.Success(scene)
+    }
+
+    override suspend fun deleteScene(
+        profileId: ProviderProfileId,
+        sceneId: SceneId,
+    ): DomainResult<Unit> {
+        val scenes = currentScenes(profileId).orEmpty()
+        val updated = scenes.filterNot { it.id == sceneId }
+        if (updated.size == scenes.size) return notFound(sceneId)
+        publish(profileId, updated)
+        return DomainResult.Success(Unit)
+    }
+
+    /**
+     * Replaces the catalog for [profileId] in tests. Returns the same repository so callers can
+     * chain `repo.setScenes(profile, listOf(...))`.
+     */
+    fun setScenes(profileId: ProviderProfileId, scenes: List<Scene>): FakeSceneRepository {
+        require(scenes.all { it.profileId == profileId }) {
+            "All scenes must belong to the supplied provider profile"
+        }
+        publish(profileId, scenes)
+        return this
+    }
+
+    fun setError(profileId: ProviderProfileId, error: DomainError) {
+        flowFor(profileId).value = DomainResult.Failure(error)
+    }
+
+    private fun flowFor(
+        profileId: ProviderProfileId,
+    ): MutableStateFlow<DomainResult<List<Scene>>> =
+        flows.getOrPut(profileId) {
+            val initial = if (profileId == localProfile) defaultScenes(profileId) else emptyList()
+            MutableStateFlow(DomainResult.Success(initial))
+        }
+
+    private fun currentScenes(profileId: ProviderProfileId): List<Scene>? =
+        (flowFor(profileId).value as? DomainResult.Success)?.value
+
+    private fun publish(profileId: ProviderProfileId, scenes: List<Scene>) {
+        flowFor(profileId).value = DomainResult.Success(scenes)
+    }
+
+    private fun notFound(sceneId: SceneId): DomainResult<Nothing> = DomainResult.Failure(
+        DomainError.InvalidRequest(
+            detail = "Scene ${sceneId.value} not found",
+        ),
+    )
+
+    private fun defaultScenes(profileId: ProviderProfileId): List<Scene> = listOf(
+        Scene(
+            id = SceneId("${profileId.value}:scene-leaving-home"),
+            profileId = profileId,
+            name = "Leaving home",
+            icon = SceneIcon.AWAY,
+            color = SceneColor("#FF8A65"),
+            actions = listOf(
+                SceneAction.SocketPower(
+                    id = SceneActionId("${profileId.value}:scene-leaving-home:socket-1"),
+                    profileId = profileId,
+                    deviceName = DeviceName("socket-1"),
+                    powerState = SocketPowerState.OFF,
+                ),
+                SceneAction.InfraredKey(
+                    id = SceneActionId("${profileId.value}:scene-leaving-home:ir-1"),
+                    profileId = profileId,
+                    deviceName = DeviceName("ir-1"),
+                    key = "power",
+                ),
+            ),
+        ),
+        Scene(
+            id = SceneId("${profileId.value}:scene-movie-night"),
+            profileId = profileId,
+            name = "Movie night",
+            icon = SceneIcon.MOVIE,
+            color = SceneColor("#7986CB"),
+            actions = listOf(
+                SceneAction.SocketPower(
+                    id = SceneActionId("${profileId.value}:scene-movie-night:socket-1"),
+                    profileId = profileId,
+                    deviceName = DeviceName("socket-1"),
+                    powerState = SocketPowerState.OFF,
+                ),
+            ),
+        ),
+    )
+
+    companion object {
+        /**
+         * The canonical profile id used by the in-app local experience provider. UI code that
+         * hard-codes a profile in phase 1 should use this constant so the Fake shows data.
+         */
+        val localProfile: ProviderProfileId = ProviderProfileId("local-experience")
+    }
+}
+
+/**
+ * Fake [SceneExecutor] that drives the existing [SocketGateway] and [InfraredGateway] fakes.
+ *
+ * Behaviour matches the project_plan.md §4.7 contract:
+ * - actions run sequentially in [Scene.actions] order;
+ * - a single action failure does not abort subsequent actions;
+ * - the returned [SceneExecutionResult] contains one entry per action;
+ * - re-entering execute() while a scene is running returns [DomainError.OperationFailed].
+ */
+class FakeSceneExecutor(
+    private val socketGateway: SocketGateway,
+    private val infraredGateway: InfraredGateway,
+) : SceneExecutor {
+    private val running = ConcurrentHashMap<SceneId, Boolean>()
+
+    override suspend fun execute(scene: Scene): DomainResult<SceneExecutionResult> {
+        val alreadyRunning = running.putIfAbsent(scene.id, true) != null
+        if (alreadyRunning) {
+            return DomainResult.Failure(
+                DomainError.OperationFailed(
+                    detail = "Scene ${scene.id.value} is already running",
+                ),
+            )
+        }
+        return try {
+            val results = scene.actions.map { action -> executeAction(scene.profileId, action) }
+            DomainResult.Success(SceneExecutionResult(scene = scene, results = results))
+        } finally {
+            running.remove(scene.id)
+        }
+    }
+
+    private suspend fun executeAction(
+        profileId: ProviderProfileId,
+        action: SceneAction,
+    ): SceneActionExecutionResult {
+        val result = when (action) {
+            is SceneAction.SocketPower -> socketGateway.setPower(
+                profileId = profileId,
+                deviceName = action.deviceName,
+                powerState = action.powerState,
+            )
+
+            is SceneAction.InfraredKey -> infraredGateway.sendKey(
+                profileId = profileId,
+                deviceName = action.deviceName,
+                key = action.key,
+            )
+        }
+        return when (result) {
+            is DomainResult.Success -> SceneActionExecutionResult(
+                action = action,
+                outcome = SceneActionOutcome.SUCCESS,
+                error = null,
+            )
+
+            is DomainResult.Failure -> SceneActionExecutionResult(
+                action = action,
+                outcome = SceneActionOutcome.FAILURE,
+                error = result.error,
+            )
+        }
+    }
+}

testing/fakes/src/test/kotlin/com/flagship/abox/manager/testing/fakes/FakeSceneExecutorTest.kt

@@ -0,0 +1,167 @@
+package com.flagship.abox.manager.testing.fakes
+
+import com.flagship.abox.manager.domain.DeviceName
+import com.flagship.abox.manager.domain.DomainError
+import com.flagship.abox.manager.domain.DomainResult
+import com.flagship.abox.manager.domain.ProviderProfileId
+import com.flagship.abox.manager.domain.Scene
+import com.flagship.abox.manager.domain.SceneAction
+import com.flagship.abox.manager.domain.SceneActionId
+import com.flagship.abox.manager.domain.SceneActionOutcome
+import com.flagship.abox.manager.domain.SceneColor
+import com.flagship.abox.manager.domain.SceneIcon
+import com.flagship.abox.manager.domain.SceneId
+import com.flagship.abox.manager.domain.SocketGateway
+import com.flagship.abox.manager.domain.SocketPowerState
+import com.flagship.abox.manager.domain.SocketStatus
+import kotlinx.coroutines.CompletableDeferred
+import kotlinx.coroutines.async
+import kotlinx.coroutines.test.runTest
+import org.junit.Assert.assertEquals
+import org.junit.Assert.assertFalse
+import org.junit.Assert.assertTrue
+import org.junit.Test
+
+class FakeSceneExecutorTest {
+    private val profileId = ProviderProfileId("abox")
+
+    @Test
+    fun executesActionsInOrder() = runTest {
+        val socketGateway = FakeSocketGateway()
+        val infraredGateway = FakeInfraredGateway()
+        val executor = FakeSceneExecutor(socketGateway, infraredGateway)
+        val scene = scene(
+            actions = listOf(
+                socketAction("socket-1", SocketPowerState.ON),
+                infraredAction("ir-1", "power"),
+                socketAction("socket-2", SocketPowerState.OFF),
+            ),
+        )
+
+        val result = executor.execute(scene)
+
+        assertTrue(result is DomainResult.Success)
+        val executionResult = (result as DomainResult.Success).value
+        assertEquals(3, executionResult.results.size)
+        executionResult.results.forEach {
+            assertEquals(SceneActionOutcome.SUCCESS, it.outcome)
+        }
+        assertEquals(1, infraredGateway.sentKeys.size)
+    }
+
+    @Test
+    fun continuesAfterActionFailure() = runTest {
+        val socketGateway = FakeSocketGateway()
+        socketGateway.setError(
+            profileId,
+            DeviceName("socket-1"),
+            DomainError.DeviceOffline(detail = "offline"),
+        )
+        val infraredGateway = FakeInfraredGateway()
+        val executor = FakeSceneExecutor(socketGateway, infraredGateway)
+        val scene = scene(
+            actions = listOf(
+                socketAction("socket-1", SocketPowerState.ON),
+                infraredAction("ir-1", "power"),
+            ),
+        )
+
+        val result = executor.execute(scene)
+
+        assertTrue(result is DomainResult.Success)
+        val executionResult = (result as DomainResult.Success).value
+        assertEquals(2, executionResult.results.size)
+        assertEquals(SceneActionOutcome.FAILURE, executionResult.results[0].outcome)
+        assertEquals(SceneActionOutcome.SUCCESS, executionResult.results[1].outcome)
+        assertEquals(1, executionResult.succeededCount)
+        assertEquals(1, executionResult.failedCount)
+        assertFalse(executionResult.allSucceeded)
+    }
+
+    @Test
+    fun runningSceneRejectsConcurrentExecution() = runTest {
+        val gate = CompletableDeferred<Unit>()
+        val socketGateway = BlockingSocketGateway(gate)
+        val executor = FakeSceneExecutor(socketGateway, FakeInfraredGateway())
+        val scene = scene(
+            actions = listOf(socketAction("socket-1", SocketPowerState.ON)),
+        )
+
+        val first = async { executor.execute(scene) }
+        // Let the first coroutine enter the executor and block on the socket gateway.
+        testScheduler.advanceUntilIdle()
+        val second = async { executor.execute(scene) }
+        val secondResult = second.await()
+
+        assertTrue(secondResult is DomainResult.Failure)
+        assertTrue((secondResult as DomainResult.Failure).error is DomainError.OperationFailed)
+
+        gate.complete(Unit)
+        val firstResult = first.await()
+        assertTrue(firstResult is DomainResult.Success)
+    }
+
+    @Test
+    fun emptySceneSucceedsWithNoResults() = runTest {
+        val executor = FakeSceneExecutor(FakeSocketGateway(), FakeInfraredGateway())
+        val scene = scene(actions = emptyList())
+
+        val result = executor.execute(scene)
+
+        assertTrue(result is DomainResult.Success)
+        val executionResult = (result as DomainResult.Success).value
+        assertEquals(0, executionResult.results.size)
+        assertEquals(0, executionResult.succeededCount)
+        assertEquals(0, executionResult.failedCount)
+        assertFalse(executionResult.allSucceeded)
+    }
+
+    private fun scene(actions: List<SceneAction>): Scene = Scene(
+        id = SceneId("${profileId.value}:scene-test"),
+        profileId = profileId,
+        name = "Test scene",
+        icon = SceneIcon.HOME,
+        color = SceneColor("#FF8A65"),
+        actions = actions,
+    )
+
+    private fun socketAction(
+        deviceName: String,
+        powerState: SocketPowerState,
+    ): SceneAction.SocketPower = SceneAction.SocketPower(
+        id = SceneActionId("${profileId.value}:action-${deviceName}-${powerState.name}"),
+        profileId = profileId,
+        deviceName = DeviceName(deviceName),
+        powerState = powerState,
+    )
+
+    private fun infraredAction(
+        deviceName: String,
+        key: String,
+    ): SceneAction.InfraredKey = SceneAction.InfraredKey(
+        id = SceneActionId("${profileId.value}:action-${deviceName}-$key"),
+        profileId = profileId,
+        deviceName = DeviceName(deviceName),
+        key = key,
+    )
+
+    private class BlockingSocketGateway(
+        private val gate: CompletableDeferred<Unit>,
+    ) : SocketGateway {
+        override suspend fun getStatus(
+            profileId: ProviderProfileId,
+            deviceName: DeviceName,
+        ): DomainResult<SocketStatus> = DomainResult.Success(
+            SocketStatus(profileId, deviceName, SocketPowerState.OFF),
+        )
+
+        override suspend fun setPower(
+            profileId: ProviderProfileId,
+            deviceName: DeviceName,
+            powerState: SocketPowerState,
+        ): DomainResult<SocketStatus> {
+            gate.await()
+            return DomainResult.Success(SocketStatus(profileId, deviceName, powerState))
+        }
+    }
+}

testing/fakes/src/test/kotlin/com/flagship/abox/manager/testing/fakes/FakeSceneRepositoryTest.kt

@@ -0,0 +1,149 @@
+package com.flagship.abox.manager.testing.fakes
+
+import com.flagship.abox.manager.domain.DeviceName
+import com.flagship.abox.manager.domain.DomainError
+import com.flagship.abox.manager.domain.DomainResult
+import com.flagship.abox.manager.domain.ProviderProfileId
+import com.flagship.abox.manager.domain.Scene
+import com.flagship.abox.manager.domain.SceneAction
+import com.flagship.abox.manager.domain.SceneActionId
+import com.flagship.abox.manager.domain.SceneColor
+import com.flagship.abox.manager.domain.SceneIcon
+import com.flagship.abox.manager.domain.SceneId
+import com.flagship.abox.manager.domain.SocketPowerState
+import kotlinx.coroutines.flow.first
+import kotlinx.coroutines.test.runTest
+import org.junit.Assert.assertEquals
+import org.junit.Assert.assertNotNull
+import org.junit.Assert.assertNull
+import org.junit.Assert.assertTrue
+import org.junit.Test
+
+class FakeSceneRepositoryTest {
+    private val aboxProfile = ProviderProfileId("abox")
+    private val localProfile = FakeSceneRepository.localProfile
+
+    @Test
+    fun defaultScenesAreIsolatedByProviderProfile() = runTest {
+        val repo = FakeSceneRepository()
+
+        val aboxScenes = scenesFor(repo, aboxProfile)
+        val localScenes = scenesFor(repo, localProfile)
+
+        assertEquals(0, aboxScenes.size)
+        assertEquals(2, localScenes.size)
+        assertTrue(localScenes.all { it.profileId == localProfile })
+    }
+
+    @Test
+    fun createScenePublishesSceneToFlow() = runTest {
+        val repo = FakeSceneRepository()
+        val scene = sampleScene(localProfile, "scene-1")
+
+        val result = repo.createScene(localProfile, scene)
+
+        assertTrue(result is DomainResult.Success)
+        assertEquals(scene, (result as DomainResult.Success).value)
+        val list = scenesFor(repo, localProfile)
+        assertEquals(3, list.size)
+        assertEquals(scene, list.last())
+    }
+
+    @Test
+    fun createSceneWithDuplicateIdFails() = runTest {
+        val repo = FakeSceneRepository()
+        val scene = sampleScene(localProfile, "dup")
+
+        repo.createScene(localProfile, scene)
+        val second = repo.createScene(localProfile, scene)
+
+        assertTrue(second is DomainResult.Failure)
+        assertTrue((second as DomainResult.Failure).error is DomainError.InvalidRequest)
+    }
+
+    @Test
+    fun updateSceneReplacesExistingEntry() = runTest {
+        val repo = FakeSceneRepository()
+        val original = sampleScene(localProfile, "scene-2", "Original")
+        repo.createScene(localProfile, original)
+
+        val updated = original.copy(name = "Renamed")
+        val result = repo.updateScene(localProfile, updated)
+
+        assertTrue(result is DomainResult.Success)
+        val list = scenesFor(repo, localProfile)
+        assertEquals(3, list.size)
+        val stored = list.first { it.id == original.id }
+        assertEquals("Renamed", stored.name)
+    }
+
+    @Test
+    fun deleteSceneRemovesEntry() = runTest {
+        val repo = FakeSceneRepository()
+        val scene = sampleScene(localProfile, "scene-3")
+        repo.createScene(localProfile, scene)
+
+        val result = repo.deleteScene(localProfile, scene.id)
+
+        assertTrue(result is DomainResult.Success)
+        val list = scenesFor(repo, localProfile)
+        assertEquals(2, list.size)
+        assertNull(list.firstOrNull { it.id == scene.id })
+    }
+
+    @Test
+    fun deleteUnknownSceneFails() = runTest {
+        val repo = FakeSceneRepository()
+
+        val result = repo.deleteScene(localProfile, SceneId("missing"))
+
+        assertTrue(result is DomainResult.Failure)
+        assertTrue((result as DomainResult.Failure).error is DomainError.InvalidRequest)
+    }
+
+    @Test
+    fun getSceneReturnsNullForUnknownId() = runTest {
+        val repo = FakeSceneRepository()
+
+        val result = repo.getScene(localProfile, SceneId("missing"))
+
+        assertTrue(result is DomainResult.Success)
+        assertNull((result as DomainResult.Success).value)
+    }
+
+    @Test
+    fun setErrorStopsPublishingSuccess() = runTest {
+        val repo = FakeSceneRepository()
+        repo.setError(localProfile, DomainError.Unknown(detail = "boom"))
+
+        val value = repo.observeScenes(localProfile).first()
+
+        assertTrue(value is DomainResult.Failure)
+        assertNotNull((value as DomainResult.Failure).error)
+    }
+
+    private suspend fun scenesFor(
+        repo: FakeSceneRepository,
+        profileId: ProviderProfileId,
+    ): List<Scene> = (repo.observeScenes(profileId).first() as DomainResult.Success).value
+
+    private fun sampleScene(
+        profileId: ProviderProfileId,
+        idSuffix: String,
+        name: String = "Test scene",
+    ): Scene = Scene(
+        id = SceneId("${profileId.value}:scene-$idSuffix"),
+        profileId = profileId,
+        name = name,
+        icon = SceneIcon.HOME,
+        color = SceneColor("#FF8A65"),
+        actions = listOf(
+            SceneAction.SocketPower(
+                id = SceneActionId("${profileId.value}:scene-$idSuffix:1"),
+                profileId = profileId,
+                deviceName = DeviceName("socket-1"),
+                powerState = SocketPowerState.ON,
+            ),
+        ),
+    )
+}