chore: add .gitignore

.gitignore

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+# AI Coding Tools — workspace / state / cache
+
+.claude
+.cursor
+.trae/tasks
+.trae/summary
+.trae/documents
+.windsurf
+.cline/
+.aider*
+.codebuddy
+.qoder
+.serena
+.sisyphus
+.factory
+.ace-tool/
+.omo/
+.omc/
+.omx/
+.chunkhound/
+.kiro
+.agent/summary
+*.agent/summary
+openspec
+
+# IDEs & Editors
+
+.idea/
+*.iml
+*.ipr
+*.iws
+/out/
+*target*
+.idea_modules/
+atlassian-ide-plugin.xml
+.vscode
+*.code-workspace
+*.suo
+*.ntvs*
+*.njsproj
+*.sln
+*.sw?
+.classpath
+.project
+.settings/
+
+# OS-specific junk
+
+.DS_Store
+Thumbs.db
+Desktop.ini
+.fuse_hidden*
+.directory
+
+# Build artifacts / binaries / caches
+
+tmp/
+dumps/
+.builds/
+*.out
+*.test
+*.prof
+*.bin
+dist/
+build/
+.gomodcache
+.gocache
+*.sum
+logs/
+*.log
+.env
+.env.*
+!.env.example
+
+# Databases (local dev)
+
+*.sqlite
+*.sqlite3
+*.db
+*-journal
+*.db-shm
+*.db-wal
+*.db3
+
+# CI / Lint / Coverage artifacts
+
+coverage.out
+coverage.txt
+coverage.html
+test-results/
+*.trx
+
+# Misc / project-agnostic
+
+*.csv
+*.b64
+*.backup
+*.bak
+crashlytics.properties
+crashlytics-build.properties
+com_crashlytics_export_strings.xml

.trae/rules/all.md

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+@AGENTS.md Please read the project root AGENTS.md file for complete project rules.

CLAUDE.md

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+@AGENTS.md Please read the project root AGENTS.md file for complete project rules.