Replace hook file mechanism with discovery-based pinned beads:
- gt hook: now runs bd update <bead> --status=pinned
- gt sling: same, plus nudge to target
- gt handoff: same when bead ID provided
- gt prime: checks pinned beads instead of hook files
- gt mol status: no longer checks hook files
Key changes:
- outputAttachmentStatus: extended to all roles (was Crew/Polecat only)
- checkSlungWork: now queries pinned beads instead of reading hook files
- wisp/io.go functions: marked deprecated with migration notes
This follows Gas Town discovery over explicit state principle.
Hook files are kept for backward compatibility but no longer written.
🤖 Generated with [Claude Code](https://claude.com/claude-code)
Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>
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