Implement /gcal Google Calendar integration
Components:
- commands/gcal.md: Slash command with aliases (calendar, cal)
- skills/gcal/SKILL.md: Usage patterns, routing logic, output formats
- mcp/delegation/gcal_delegate.py: Python API wrapper with tiered delegation
Features:
- Subcommands: today, tomorrow, week, next, summary
- Smart default (today before 6pm, tomorrow after)
- Hybrid interface (subcommands + natural language)
- Haiku tier for fetch/format, Sonnet tier for analysis
Requires OAuth setup: enable Calendar API and authorize.
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Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>
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