Why: inode reuse let a rebuilt lock pass Bind. The pin and the spec now require a shared lock_gen. Evidence: Backend ef66bfb. SELF go test of instanceguard, store, and app. Impact: Dev gitlink moves to ef66bfb. Operators still adopt only after confirming the same instance. Refs: Backend pull request 183 Co-authored-by: Cursor <cursoragent@cursor.com>
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