v2.0.0 - Large-codebase readiness and MCP-native integration

Multi-language semantic search (TS/TSX/JS + 25 languages), incremental auto-fresh indexing (0.3s no-change re-index on 32k files), warm serve daemon (~0.4s searches), a real Model Context Protocol server with steered tool descriptions, self-advertising installs (CLAUDE.md/AGENTS.md/.mcp.json), restored heal/graph/hybrid-search/predict-context/hook-guardian commands, project-scoped memory, JS toolchain integration for review/security, flattened first-class repo layout, CI on Linux and Windows, 125 tests. See CHANGELOG.md for details.