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seaweedfs/weed
pingqiuandClaude Opus 4.6 d5b2a3a345 fix: WALTailLSN is now an LSN boundary, ScanWALEntries uses durable checkpoint
Finding 1: WALTailLSN semantic fix
- StatusSnapshot().WALTailLSN now reads super.WALCheckpointLSN (an LSN)
- Was: wal.Tail() which returns a physical byte offset
- Entries with LSN > WALTailLSN are guaranteed in the WAL

Finding 2: ScanWALEntries replay-source fix
- ScanWALEntries passes super.WALCheckpointLSN as the recycled boundary
- Was: flusher.CheckpointLSN() which in V1 equals CommittedLSN
- The flusher's live checkpoint may advance in memory, but entries above
  the durable superblock checkpoint are still physically in the WAL
- Normal catch-up (replica at 70, committed at 100) now works because
  fromLSN=71 > super.WALCheckpointLSN (which is the last persisted
  checkpoint, not the live flusher state)

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>
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