a42b487b1f
Adds PRD 0013, the shared foundation for the stuck-agent recovery flow (overview in PRD 0012). Defines the MCP sidecar, the three tool definitions, the proposal queue, the read-only current-config mount, the minimal TUI, and the audit log format. Approval handlers are deliberately no-ops; the actual remediations land in PRDs 0014, 0015, and 0016. Co-Authored-By: Claude Opus 4.7 <noreply@anthropic.com>