FU-05 core (closes#11652): caller-supplied Video Bridge transcripts had no bounded, deterministic contract — a client could self-assert source: "embedded"/"audio-bridge" and it was accepted verbatim. normalizeVideoTranscript gained a code-only trustedSource seam unreachable from request-body JSON; without it, any cue declaring embedded/audio-bridge is reclassified to client. Added budgets (256 cues, 4096 code units/cue, 4KiB/cue, 64KiB total), malformed-surrogate rejection, focus-window scoping, deterministic cross-source reconciliation, and bumped the result-cache version v4→v5 so old-contract cache entries can never serve new-contract requests.
All 187 videoBridge* tests pass (185 pass, 2 unrelated pre-existing skips).
Merged via /merge-batch (v3.8.51). Boarded and validated in a combined worktree alongside the batch's other in-flight PRs — full gate suite green (typecheck:core, lint, complexity/cognitive-complexity, file-size, changelog-integrity, focused tests including the video-bridge fusion/transcript suites). Thank you.
The fusion result's availability, partial and failure fields now reach
DescribedVideo.fusion, the guardrail meta (audioFusionRuns/Partials/
FailureCodes), the result-cache metadata and bridge stats. Audio
transcript validation moved inside the fusion's audio branch, so an
invalid audioTranscript records failures.audio and keeps the visual
description instead of failing the whole video.
