Add new bd doctor check that detects when sync-branch is configured
but the pre-push hook is too old (< 0.29.0) to support it. This causes
circular "bd sync" failures where the hook recommends running bd sync
but the user is already running bd sync.
The check:
- Returns error when hook version < 0.29.0 with sync-branch configured
- Returns warning for custom (non-bd) hooks that can't be verified
- Returns OK when hook is compatible or sync-branch not configured
Also adds checkSyncBranchHookQuick() for --check-health mode.
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Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>
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