chore: import upstream snapshot with attribution

.gitignore

@@ -0,0 +1,68 @@
+# Binaries
+code-graph-mcp
+/codebase-memory-mcp
+bin/
+*.exe
+*.dll
+*.so
+*.dylib
+
+# Test artifacts
+*.test
+*.out
+coverage.txt
+
+# Test fixture temp dirs (created by C test suite in CWD instead of /tmp/)
+cbm_*/
+cli-*/
+
+# IDE
+.idea/
+.vscode/
+*.swp
+*.swo
+
+# OS
+.DS_Store
+Thumbs.db
+
+# Database files (local cache)
+*.db
+*.db-wal
+*.db-shm
+
+# MCP config (user-local, generated by install command)
+.mcp.json
+
+# MCP Registry auth tokens
+.mcpregistry_*
+
+# Local project memory (Claude Code auto-memory)
+memory/
+reference/
+
+# Local-only scratch / session notes (never pushed)
+private/
+
+# Build artifacts
+build/
+node_modules/
+graph-ui/dist/
+
+# Generated reports
+BENCHMARK_REPORT.md
+TEST_PLAN.md
+CHANGELOG.md
+
+# Soak test output
+soak-results/
+
+# LSP originality-check reference cache (scripts/check-lsp-originality.sh)
+.lsp-refs/
+
+# Local npm cache
+graph-ui/.npm-cache-local/
+
+# Python bytecode from tests/windows/ harness
+__pycache__/
+*.pyc