chore: bump version to 0.27.0

Release highlights:
- Custom status states via config (bd-1pj6)
- Contributor fork workflows: bd init --contributor (bd-bx9)
- Full git worktree support (#416)
- CRITICAL: Sync corruption prevention (hash-based staleness + reverse ZFC)
- Out-of-order dependency handling in JSONL import (#414)
- bd sync --squash for batching commits (bd-o2e)
- Fresh clone detection in bd doctor (bd-4ew)

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Co-Authored-By: Claude <noreply@anthropic.com>

cmd/bd/templates/hooks/pre-commit

@@ -1,5 +1,5 @@
 #!/bin/sh
-# bd-hooks-version: 0.26.2
+# bd-hooks-version: 0.27.0
 #
 # bd (beads) pre-commit hook
 #