Replace bd mol run call with separate bd commands:
1. bd pour - creates issues from proto template
2. bd update --status=in_progress - claims work
3. bd pin - pins root for session recovery
This moves orchestration logic into gt (where it belongs) and keeps
bd as pure data operations. Coordinated with bd-00u3 which deprecates
bd mol run.
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Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>
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