When user types '/start-work my-plan ultrawork', the hook now:
1. Extracts plan name from <user-request> section
2. Strips ultrawork/ulw keywords from the plan name
3. Searches for matching plan (exact then partial match)
4. Uses the matched plan instead of resuming stale boulder state
This fixes the bug where '/start-work [PLAN] ultrawork' would:
- Include 'ultrawork' as part of the plan name argument
- Ignore the explicit plan and resume an old stale plan from boulder.json
Co-authored-by: Sisyphus <clio-agent@sisyphuslabs.ai>
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