* feat(lint): dense motion re-sampling for content_overlap
Transient text-on-text collisions during continuous motion (e.g. an
orbiting label card crossing the center card) overlap for a fraction of
a second that the sparse 9-point layout grid seeks straight past. The
content_overlap detector is correct; it just never gets a sample at the
crossing moment. Rerun ONLY content_overlap on an 8fps grid (text-only,
cheap) when the composition animates; findings feed the existing
persistence tiering unchanged.
Co-Authored-By: Claude Opus 4.8 <[email protected]>
* fix(lint): unconditional dense content_overlap pass + honor 500ms floor
Round-1 blocker: the dense motion-overlap re-pass was gated on sparse-grid
geometry fingerprints changing, so an animation aliased to the sparse grid
(identical fingerprints, yet colliding between samples) bypassed the pass —
exactly the transient false-negative it was built to catch. Remove the gate:
the dense pass now runs unconditionally (bounded, text-only), driven by the
composition timeline rather than a fingerprint heuristic.
Round-2 follow-ups:
- Persistence-tier drift: at 8fps, occurrences>=2 spans only ~125ms, not the
~500ms the design intends, and it short-circuited before the ms floor.
content_overlap promotion now requires BOTH occurrences>=2 AND a literal
firstSeen..lastSeen span >= 500ms, so the wall-clock floor is honored at any
sampling density. Comment block updated to match.
- Sample cap scales to hold a true 8fps grid up to ~75s (raised 120 -> 600)
with an explicit note that longer comps degrade below 8fps to stay bounded.
Tests:
- Replaced the trivial "warning at every sample" test with a real between-grid
regression: a collision living only inside (3.5,4.5) — a gap the sparse grid
seeks past — is detected and, held ~750ms, promoted to error.
- Replaced the now-invalid "skips when static" test with one asserting the
dense pass runs even when sparse fingerprints are identical (aliased motion).
- Added a tiering regression: two dense occurrences spanning ~125ms stay a
warning (not error). Both new guards verified red before the fix.
Co-Authored-By: Claude Opus 4.8 <[email protected]>
* perf(lint): settle-free geometry seek for dense content_overlap pass
The dense overlap re-pass did up to OVERLAP_MAX_SAMPLES full-settle seeks
(120ms paint settle each, ~72s of pure sleep at the ceiling) even though
collectOverlap only reads getBoundingClientRect geometry, valid
synchronously after the timeline setTime. Add a settle-free
DENSE_GEOMETRY_SEEK_OPTIONS + driver.seekGeometry used only by the dense
loop; the base grid keeps full-settle driver.seek.
Co-Authored-By: Claude Opus 4.8 <[email protected]>
* test(lint): document + cover content_overlap 500ms boundary for sparse callers
The occurrences>=2 AND heldMs>=500 promotion rule is a semantics change for
sparse callers (--samples 20, --at, short comps) whose two samples can land
<500ms apart. Document the change in the tiering comment and add boundary
tests: 499ms span stays warning, 500ms span promotes to error.
Co-Authored-By: Claude Opus 4.8 <[email protected]>
* fix(lint): make dense content_overlap seek genuinely geometry-only
Per review: DENSE_GEOMETRY_SEEK_OPTIONS only overrode settleMs, still
inheriting animationFrameSettle:double + waitForFontsMs:500 → ~3 frame
waits + font wait per seek → ~30s at the 600-sample cap. Geometry
(getBoundingClientRect) is valid synchronously post-setTime, so drop all
post-seek waits (animationFrameSettle:none, waitForFontsMs:0, settleMs:0).
Add options-level regression locking the geometry-only contract. Also fix
a stale comment name (detectMotionTextOverlap → collectMotionOverlapSamples).
Co-Authored-By: Claude Opus 4.8 <[email protected]>
* style: collapse multi-line comments to single lines
Co-Authored-By: Claude Opus 4.8 <[email protected]>
---------
Co-authored-by: Claude Opus 4.8 <[email protected]>
## What it catches
A gauge needle / clock hand / dial pointer / radar sweep that rotates about the **wrong pivot** — the recovered center-of-rotation sits far from the dial hub (e.g. `transform-origin` at the needle base or SVG element edge instead of the dial center). Visually the needle "wobbles" or orbits off-axis instead of sweeping cleanly about the hub.
This is a genuine gap in the current checks: `rotation_pivot_drift` (#2741) provably **cannot** catch it — a correct sweeping needle's bbox-center orbits identically to a broken one, so only a **dial-hub reference** distinguishes them. This is the separate hub-referenced check that analysis called for.
## How it works
- Sampler maps 2 material endpoints per frame via `getScreenCTM` (honors the actual rendered transform, independent of `svgOrigin`).
- Resolves the dial hub = shared center of the modal set of static concentric circles, or the arc-center of the largest static near-circular path (Kasa circle fit).
- Fits a circle to the endpoint trajectory to recover the true center-of-rotation; flags drift `> 0.35 * pointer_length`. One warning per hub.
- Never fires without a resolvable hub. Walks the rotation reference to the composition root (not the `<svg>`) so a pointer rotated by a `div` ancestor is measured correctly.
- Multi-body guard: `>= 2` bodies at distinct angular positions on one hub = orbit/atom system, not a dial → suppressed.
## Corpus evidence (autonomous geometry-fuzz run, 81 fuzzed diagrams)
- **7 / 7 true positives, 0 false positives across all 81 samples.**
- Assigned TPs: fuzz005, fuzz017, fuzz032. Bonus TPs: fuzz044, fuzz056, fuzz068, fuzz080.
- **The Gemini-3.6 video-judge itself MISSED all 4 bonus TPs** (`vlm_has_defects: false`) — the deterministic hub-reference check beats the VLM on this defect class.
- FPs driven to 0 by the two principled guards above: fuzz016 (planet arc rotated by a `div` ancestor) cleared by root-walk; fuzz055 (atom) cleared by the multi-body guard.
- fuzz080 reads as a false positive to the connector check but is a true positive here — confirms the architectural boundary between the two checks is drawn correctly.
## Validation
- Autonomous Gemini-3.6 **video**-judge fuzz run to surface candidate defects, then a **deterministic FP sweep** across all 81 rendered compositions (not VLM-gated — code inspection is the arbiter, since the VLM both over- and under-calls this class).
- 9 unit tests (`checkPipeline.offPivotRotation.test.ts`) + full check suite pass; `bun run build` green.
🤖 Generated with [Claude Code](https://claude.com/claude-code)
The media_in_subcomposition rule blanket-errored every <video>/<audio>
inside a sub-composition, claiming nested media is "never seeked/decoded
and renders blank/black". This is false: the runtime discovers media with
a flat document.querySelectorAll("video, audio"), resolves each element's
host composition via closest("[data-composition-id]"), and rebases its
local data-start by the accumulated absolute start of every ancestor
composition (packages/core/src/runtime/{media,startResolver}.ts). Media
seeks and decodes at any nesting depth, verified end to end through the
producer render path.
- Remove the rule and flip its test to assert nested media is NOT flagged.
- Drop the now-dead media_in_subcomposition clause from the registry
components test.
- Drop the equivalent pre-render guard from the faceless-explainer and
pr-to-video assemble scripts.
- Correct the reference docs (hyperframes-core SKILL, data-attributes,
variables-and-media, composition-patterns; hyperframes-cli
lint-validate-inspect): media works at any depth. Preserve the one real
constraint, that a sub-comp timeline cannot reach host-root elements, so
host-root media motion is authored on the main timeline.
## What
New cross-sample layout check `rotation_pivot_drift` — flags a rotating element that should spin **in place** but pivots about the **wrong point** (e.g. a wheel whose spokes use a hardcoded px `transformOrigin` instead of `svgOrigin`/`%`, so they swing off-center while every existing check still passes).
Motivating prod case: a portrait ad's spoked-wheel whose `#spokes` rotated about `transformOrigin:"250px 250px"` in a resized 460px container — spokes detached from the hub, shipped clean because no rule inspects rotation.
## How
- `layout-audit.browser.js`: `window.__hyperframesRotationSample()` reports each visible transformed element's bbox center + decoded rotation angle per layout sample. Skips `[data-layout-allow-orbit]`.
- `checkPipeline.ts`: accumulates samples across the seek grid; `detectRotationPivotDrift()` (modeled on `detectSweepStatic`) flags an element that (a) actually spins (angle spread > 20° over ≥3 samples), (b) is size-stable (bbox width ratio ≤ 1.6), and (c) whose bbox **center** drifts > `max(10% of its size, 2% of min viewport dim)`. Emits `warning`; not persistence-tiered (not demoted to info).
## FP guards
Real rotation required, ≥3 samples, size stability, `data-layout-allow-orbit` exemption, min area ~2500px². Center-drift (not bbox size) is the discriminator, so a correctly-centered spinner reads drift ≈ 0.
## Validation (`check --json`)
| Fixture | Expected | Result |
|---|---|---|
| off-transformOrigin spoked wheel | fire | **fired — 109px drift on `#spokes`** |
| non-spinning comps (node diagram, device tree) | clean | clean, no FP |
| correctly-centered spinner (`svgOrigin`) | clean | clean (spins 162°, drift 0) |
| `data-layout-allow-orbit` off-origin spinner | clean | clean (exempt) |
| off-`svgOrigin` control, no opt-out | fire | fired — 251px drift |
No false positives. `tsc --noEmit` clean, `oxlint` clean, `check.test.ts` + `layout-audit.browser.test.ts` = 112/112 pass.
## Note
`ROTATION_MAX_SIZE_RATIO` is 1.6 (not 1.3): a rotating anisotropic shape's axis-aligned bbox inherently oscillates (8-spoke star ~1.32×, square 1.41×), so a tighter ratio rejects legitimate targets. Center-drift stays the real discriminator; thin swinging bars are excluded.
Follow-up: a `detectRotationPivotDrift` unit test via the fake driver's `collectRotationSample` (mirroring the sweep_static tests).
🤖 Generated with [Claude Code](https://claude.com/claude-code)
* docs(guides): resolve the fidelity contradiction (preserve substance, adapt form)
The guide called the rebuild 'lossy by nature' while the checklist demanded 'content
match the brief exactly', with no rule for what to preserve vs adapt. On a live import
CD kept fonts/palette/hero but genericized the source's real figures (2.4M signals/sec,
+240% spike) into vague phrases. Resolve around one principle: substance (real copy,
exact palette/fonts, distinctive figures/data, product names, signature visuals) is
preserved verbatim; only the form (static page to timed multi-scene motion) adapts.
* test(guides): pin the Send-to fidelity contract against silent regression
Address review on #2620: the resolved 'preserve substance, adapt form' instruction is
load-bearing LLM-facing prompt text, but validate-docs only proves syntax. Add a semantic
pin (mirroring packages/cli figma skillContent.test.ts) asserting the three positive
concepts are present and the two retired contradictory phrases ('lossy by nature',
'content match the brief exactly') cannot silently return.
* style(guides): oxfmt the Send-to fidelity-contract test
Wrap the readFileSync call to oxfmt form (printWidth 100); unblocks required Format + its
preflight/preview-regression cascade on #2620.
* feat(media): alpha-capable authoring proxies
Alpha sources were refused a proxy before the codec map ever asked whether the
browser could decode them, so a ProRes 4444 alpha file (which no browser
previews at all) rendered black forever, while an alpha WebM (which previews
fine) was already covered by the browser-safe check on the next line. The alpha
veto earned nothing and cost the one case that needed help.
Alpha is now a target-codec choice rather than a veto: alpha sources transcode
to VP9 + yuva420p in WebM, everything else keeps the existing H.264/MP4 path
byte for byte. Only files no browser can preview are proxied, which is the rule
the runtime already followed everywhere else.
WebM cannot carry AAC, so the VP9 path uses Opus and drops the MP4-only
faststart flag. PROXY_PARAMS_VERSION moves to v3 so clients stop serving the
previously cached proxies.
Safari does not decode VP9 alpha and still shows black for alpha sources, as it
does today: this is better on Chromium and Firefox and no worse anywhere.
* fix(media): infer proxy variant for rescue
* fix(media): preserve alpha proxy hardening after restack
James