329a97d5d2
Add MCP `ToolAnnotation` metadata (Title, ReadOnlyHint, DestructiveHint) to all registered tools so MCP hosts (VS Code, Claude, Cursor) get accurate per-tool hints. A shared `pkg/annotation` package exposes `ReadOnly`, `Write`, and `Destructive` helpers for consistency. Add `close` and `reopen` methods to `pull_request_write` so PR state can be toggled without going through the generic `update` path. Co-Authored-By: silverwind <me@silverwind.io> Co-Authored-By: Claude (Opus 4.7) <noreply@anthropic.com>