Implements on_close hooks in .beads/config.yaml for automation and
notifications. Hooks receive issue data via environment variables
(BEAD_ID, BEAD_TITLE, BEAD_TYPE, BEAD_PRIORITY, BEAD_CLOSE_REASON)
and run via sh -c.
Changes:
- internal/config: Add HookEntry type and GetCloseHooks()
- internal/hooks: Add RunConfigCloseHooks() for executing config hooks
- cmd/bd: Call RunConfigCloseHooks after successful close
- docs/CONFIG.md: Document hooks configuration with examples
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Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>
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