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gates / gates (push) Successful in 9s
B2's capture floor (v0.192.0) was consulted in exactly ONE place — captureAllRecoveryUnits, which writes a few KB. The two legs that write the BULK into the same backups/primary/<app> tree, the DB dump and the volume dump, ran FIRST and unguarded. Measured live on demo-hp 2026-08-03 06:40:03: opengist's volume dump wrote 2.0 GB with no check, free fell to 1.0 GB, and the floor then refused the cheap write it had already lost the argument to. Its refusal message claimed "the previous unit is untouched" — measured false: that app's tar had gone 182,272 B -> 2,147,666,432 B under a stale manifest. Sixth entry in CLAUDE.md's table of shipped guarantees the code did not provide. Fix: ONE admission verdict per app per run (internal/backup/admission.go), taken before that app's FIRST write and covering all three legs — they write under one per-app root, which is why one verdict can honestly cover them. - Lazy, at the app's first write, NOT once at run start: app A's dump can put app B under the reserve, so a run-start verdict reads a disk that no longer exists. - Remembered for the run, never re-decided between an app's own legs — that is the split this closes. Reset per run. - Placed ahead of DumpAppVolumesSafe, which stops the stack as its first act, so a refused app is never bounced. After the volume-less check, which has no write. - Exactly one operator alert per refused app per run. - Leg order unchanged: volume dumps still precede the capture. The floor is now SIZE-AWARE: it asks whether THIS app's write would cross the reserve, not only whether the filesystem is already below it — which is how an app was admitted at 96% and then allowed to write 2 GB. Estimate = the app's previous .sql + .tar on disk. No history -> headroom-only, deliberately, and the alert says so. A container-based du per volume was MEASURED and rejected: 66 timed runs on demo-hp guest 9201, median ~355 ms/volume (341-404) on volumes holding tens of KB — container start-up, not the walk. Decisive on top: docker run needs the writable layer, so it can fail under exactly the pressure the reserve handles. The message was NOT weakened; the behaviour was moved so the wording became true. It now also names which term bound. Every claim is checked against a sha256 fingerprint of the tree it describes, never against the log line. Still refuses and never deletes: nothing here is generational. 11 new tests through the production functions. The DB leg cannot run without Docker, so its gate is pinned by an AST walk of backup.go asserting admitApp precedes DumpOne (strings.Contains is insufficient — a commented-out call still contains the string). 4 red-proofs demonstrated failing then restored.