The backfill's sliced path is optional-by-contract: restore/hydrate/prepare/
write exist on both supported baselines, and any absence falls the session
back to the single-shot coldSnapshot. Pin all four needles (plus coldSnapshot)
per baseline tag so a removal names the seam instead of silently degrading
the pass to whole-log blocks, and record the rule in docs/compatibility.md
§6.
bowenliang123
6184f0fbc0
