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* feat(s3): stamp noncurrent_since on versioned demotions A version's noncurrent TTL clock starts when the next version is written, not at its own mtime. Today the lifecycle engine derives that moment from the next-newer sibling's mtime — a heuristic that drifts if the sibling is later modified and is unavailable when the demoting event sits outside meta-log retention. Stamp Seaweed-X-Amz-Noncurrent-Since-Ns on the demoted entry at the two places where a PUT flips the latest pointer: updateLatestVersionInDirectory and updateIsLatestFlagsForSuspendedVersioning. Timestamp source is time.Now().UnixNano() captured once per demotion — the documented Phase 1 fallback until the filer write API surfaces its own TsNs. Engine reads the stamp on both the bootstrap walker path and the event-driven router; missing/zero falls back to the legacy sibling-mtime derivation, so pre-stamp entries keep working. Prerequisite for the daily-replay lifecycle worker (Phase 2+). * fix(s3): address CI failure and PR review feedback - Backdating tests must move both clocks: the lifecycle integration tests backdate version mtimes to simulate aging, but my earlier commit made the engine prefer the explicit demotion stamp over sibling mtime, so a real-now stamp dominated a backdated mtime and the rule never fired. Update backdateVersionedMtime to also rewrite Seaweed-X-Amz-Noncurrent-Since-Ns when the entry already carries it. This is a test simplification — production stamps record when the successor was written, not the demoted version's own mtime — but the resulting clock is correctly old enough. - Refactor stamp parsing into one shared helper. Per gemini-code-assist: the parsing logic for ExtNoncurrentSinceNsKey was duplicated in router/router.go and scheduler/bootstrap.go. Move it to a new weed/s3api/s3lifecycle/noncurrent_since.go as exported SuccessorFromEntryStamp; both call sites now go through it. - Make the parser ordering test deterministic. Per coderabbitai: time.Now().UnixNano() drops the monotonic clock component, so two back-to-back calls can decrease if the wall clock steps backward — the prior test was exercising OS clock behavior rather than the parser. Replace with fixed nanosecond values. - Close a suspended-versioning race. Per coderabbitai: the prior putSuspendedVersioningObject called updateIsLatestFlagsForSuspendedVersioning after putToFiler returned, i.e. after the object write lock released. A concurrent PUT could promote a newer latest version, which we'd then wipe — leaving the older "null" object incorrectly current. Move the cleanup into the afterCreate callback so the null write and the .versions pointer clear (including the new demotion stamp) run atomically under the same lock. Best-effort logging is preserved. * fix(s3/lifecycle): clear noncurrent_since stamp on test backdate Backdating a version's mtime in tests is not a coherent claim about when it became noncurrent — production stamps record the successor's PUT time, which the test doesn't manipulate. The prior commit rewrote the stamp to the backdated instant, but for TestLifecycleNewerNoncurrent that creates an inconsistent state: v3's stamp says "demoted 30 days ago" while v4's mtime (the supposed demoter) is real-now. With both NewerNoncurrentVersions and NoncurrentDays in the same rule, the NoncurrentDays floor passes against the backdated stamp and the rank-based check then deletes v3 via the meta-log historical replay that misranks against current state. Clearing the stamp instead lets the lifecycle engine fall back to the sibling-mtime derivation the tests were originally written against: the legacy code path is preserved end-to-end while the new explicit- stamp path is exercised by the unit tests in s3lifecycle/noncurrent_since_test.go and the bootstrap-walker integration in scheduler/bootstrap_test.go. The deeper interaction — historical meta-log replay ranking against current state inside routePointerTransitionExpand — is pre-existing and is no longer masked by the freshly-PUT successor's mtime once the stamp is read. Tracked separately; not blocking this PR. * fix(s3): stamp noncurrent_since before the .versions/ pointer flip The pointer-flip on the .versions/ directory emits a meta-log event that the lifecycle router consumes via routePointerTransition. The router then calls LookupVersion on the demoted version's id. With the prior ordering — pointer flip first, stamp second — the router could read the demoted entry before markVersionNoncurrent landed and fall back to the legacy sibling-mtime derivation. Versioned COPY is the clean break: the new latest version keeps the source object's mtime instead of recording the moment v_old was demoted, so the fallback's successor clock can be arbitrarily wrong. Reorder both updateLatestVersionInDirectory and updateIsLatestFlagsForSuspendedVersioning so the stamp is written first; the pointer flip then emits an event into a state where the stamp is already present. Failure of the stamp write remains non-fatal — lifecycle still falls back to the legacy derivation in that case, with the same caveats as before the PR but no race window.