- Add Orchestrator class with handle_message() and handle_callback() entry points
- Command parsing via regex: /gsd:* pattern extraction
- Auto-session-creation per CONTEXT.md decision
- Error handling with try/except returning format_error() cards
- Approval detection integration with ApprovalHandler
- Output truncation to 2000 chars for Feishu card limits
- 18 tests passing with full coverage
Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>
starmen1265
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