Add auto-push functionality to PullFromSyncBranch for true one-command sync:
- After successful content merge, auto-push to remote by default
- Safety check: warn (but dont block) if >50% issues vanished AND >5 existed
- Vanished = removed from JSONL entirely, NOT status=closed
Changes:
- Add push parameter to PullFromSyncBranch function
- Add Pushed field to PullResult struct
- Add countIssuesInContent helper for safety check
- Add test for countIssuesInContent function
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Co-Authored-By: Claude <noreply@anthropic.com>
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