Completes UR-009. The register recorded the signature as stored; it was
not. `ingest` validated `cut.audio_signature` and wrote NULL, so every
served manifest came back without one — which also meant the plugin's own
alignment (jRay JR-047, Done) had nothing to align against and could never
run. That is the failure mode a status field is least able to catch: every
validation test passed and the feature delivered nothing.
Now stored, coarse-indexed and served back byte-identically, with a held
manifest adopting an incoming signature it lacked (§9a). `audio`-tier
matching runs on every read endpoint via an `audio_signature` parameter,
and `POST /manifests/search` answers the unknown-providence case with a
runtime prefilter, a bounded scan and honest truncation reporting.
Three rules §3 did not previously state, now normative:
- **±1 frame of slack in the score.** scene-actor-extraction VR-014
measured the exact-frame rule demoting 27 of 40 correctly aligned
releases to `loose`, because the two windows are cut on their own
file's frame grid and those grids do not coincide. With ±1 frame all
40 reach `audio` (worst 0.906) and the strongest false match is
unmoved at 0.16.
- **The offset has two terms.** Both windows are anchored at their own
file's runtime/2, so the slide alone is wrong by half the runtime
difference on every shifted release. A signature without a runtime
therefore cannot align, and is refused by name rather than answered
at a lower tier.
- **A signature verdict is final**, including its refusals. Falling back
to the runtime tier after the audio declined would let a coincidence
overturn direct evidence, inverting the ordering the tier table exists
to state.
The slide precomputes each frame's neighbourhood as a 32-bit bin set
rather than re-deriving it across 1201 slides — 3.3 ms to 1.1 ms per
candidate, with a test asserting exact equivalence to the rule written
the obvious way. The 1000-candidate search cap follows from that
measurement as a ~1.1 s ceiling per request, not a round number.
jRay's matcher still implements the pre-slack rule and will label some
alignments `loose` that this server calls `audio`. Nothing misaligns —
JR-047 makes the local answer win — but that register now carries the
follow-up.
TRACES: UR-008, UR-009 | SR-003
dtourolle
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