chore: import upstream snapshot with attribution

.gitignore

@@ -0,0 +1,75 @@
+# AI-related files (user-specific)
+.cursorrules
+.cursorignore
+.windsurf
+.codeiumignore
+.kiro
+
+# Local worktrees for parallel feature work
+.worktrees/
+
+# Code-copy related files
+.clipignore
+
+# Python-generated files
+__pycache__/
+__pycache__.meta
+build/
+!MCPForUnity/**/Build/
+dist/
+wheels/
+*.egg-info
+
+# Test coverage
+.coverage
+.coverage.*
+htmlcov/
+coverage.xml
+*.cover
+
+# Virtual environments
+.venv
+
+# Environment files (API keys)
+.env
+
+# Unity Editor
+*.unitypackage
+*.asset
+LICENSE.meta
+CONTRIBUTING.md.meta
+
+# IDE
+.idea/
+.vscode/
+.aider*
+.DS_Store*
+# Unity test project lock files
+TestProjects/UnityMCPTests/Packages/packages-lock.json
+
+# UnityMCPTests stress-run artifacts (these are created by tests/tools and should never be committed)
+TestProjects/UnityMCPTests/Assets/Temp/
+
+# Backup artifacts
+*.backup
+*.backup.meta
+
+.wt-origin-main/
+
+# CI test reports (generated during test runs)
+reports/
+
+# Local testing harness
+scripts/local-test/
+.claude/settings.local.json
+
+# Per-version logs from tools/check-unity-versions.{sh,ps1}
+tools/.unity-check-logs/
+
+# Ignore the .claude directory, since it might contain local/project-level setting such as deny and allowlist.
+/.claude
+.mcp.json
+
+# Superpowers skill working artifacts (specs, plans, SDD ledger)
+docs/superpowers/
+.superpowers/