protocol: establish Tripartite Toolchain Gate, Anti-Stall Invariant, and Dynamic File Invalidation

## Protocol Enhancement
1. Add Mandatory Tripartite Toolchain Gate (/wayfinder, /ask-matt, /octocode-research).
2. Add FastMCP Dynamic File Invalidation Invariant for DuckDB/SQLite edge adapters.
3. Add Anti-Stall & Immediate Dispatch Invariant (No announcements without tools).
4. Add Mandatory Subagent Governance Harness Injection.