Mark gcal implementation checklist complete

OAuth setup and subcommand testing verified.
Natural language fallback remains to test.

🤖 Generated with [Claude Code](https://claude.com/claude-code)

Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>

plans/2025-01-02-gcal-design.md

@@ -220,10 +220,10 @@ Calendar scope not authorized. Run:
 
 ## Implementation Checklist
 
-- [ ] Add Calendar scope to GCP OAuth app
+- [x] Add Calendar scope to GCP OAuth app
 - [x] Create `~/.claude/skills/gcal/SKILL.md`
 - [x] Create `~/.claude/commands/gcal.md`
 - [x] Create `~/.claude/mcp/delegation/gcal_delegate.py`
-- [ ] Test OAuth re-authorization
-- [ ] Test all subcommands
+- [x] Test OAuth re-authorization
+- [x] Test all subcommands
 - [ ] Test natural language fallback