VaultMesh Architect MCP Server

# Changelog ## v1.0.0 — The Self-Governing Loop (YYYY-MM-DD) - MCP stdio server with core VaultMesh tools - Constitution as MCP resource: `spec://digital-twin/constitution` - Governance tools: `sign_constitution`, `propose_charter`, `approve_charter` - Prompt: `amend_constitution` (fetch → edit → diff → propose → DAO message) - CLI: `scripts/amend_constitution.sh` (terminal ritual) - Property/E2E tests + coverage (>97% lines, >82% branches) - CI: tests + CLI dry-run canary Refer to detailed notes in `docs/releases/v1.0.0.md`.