This is a manual regression plan for the current 2.16 candidate against the last 2.15 maintenance release. The review basis was v2.15.1 (6228c72e) through 0fdfd05d; the original v2.15 tag itself contains only the version bump and Shredder levelshot, while v2.15.1 adds heartbeat/Steam-pipe fixes.
No item is pre-checked. A checked item means the stated pass condition was observed on the exact build identified in the report, not merely that the action was attempted.
- P0 — release gate. A failure blocks the candidate until triaged.
- P1 — important changed behavior. Must have representative coverage.