fix: storyboard-angle review follow-ups (M1 bg-on-clip, B3 slideshow, parser guard, CLI fixes) (#1791)

* fix(skills): storyboard review — bg-on-clip rule, slideshow output, parser parity guard

Addresses the storyboard-angle review (jrusso1020):

- M1 (invisible text): frame-worker.md (x3) + SKILL.md Step 5 (x3) now require a
  frame's full-bleed background on a class=clip layer, never the #root /
  data-composition-id element (the root is clip-gated to its scene window, so a
  background on it is not a dependable ground and dark text can land on the black
  host body). The assembler already paints frame.md's canvas onto index #root as
  the base ground; the per-frame clip rides on top.
- B3 (slideshow truncates to slide 1): slideshow/SKILL.md gains an Output section
  (decks render via 'present'; 'render index.html' captures only the first
  composition; linear main-line MP4 export is deferred).
- Parser drift: vendoredParity.test.ts guards the three vendored storyboard.mjs
  copies (byte-identical + parse-parity with @hyperframes/core).
- skills-manifest.json regenerated for the edited SKILL.md files.

Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>

* fix(cli): storyboard review — lint, validate help, snapshot, inspect, capture, render

Addresses the CLI findings from the storyboard-angle review (jrusso1020):

- lint (@hyperframes/lint): accept vendor-prefixed system-font keywords
  -apple-system / BlinkMacSystemFont so a system stack with a generic fallback no
  longer trips font_family_without_font_face (+ test).
- help: list 'validate' under Project in 'hyperframes --help' (was runnable but
  undocumented).
- snapshot: honor -o/--output (the flag did not exist; output was hardcoded to
  snapshots/). The dir is resolved once and threaded through capture + contact
  sheet + Gemini.
- snapshot: split font status into loaded / error / unused with a one-line
  summary; only a real 'error' is reported as FAILED (an unrequested @font-face
  is 'unused', not a contradiction with 'loaded').
- inspect: suppress text_occluded across a scene-to-scene crossfade (occluder in
  a different data-composition-id mount while a scene is mid-fade); a same-scene
  or two-settled-scenes overlap still flags.
- inspect: suppress content_overlap between in-flow siblings governed by the same
  flex/grid container (tight stacks / number lockups are layout slop).
- capture: record source resolution (videoWidth/Height) in video-manifest.json
  alongside the DOM display box; consumers size off the source dims.
- render: warn when the target carries a slideshow island (render captures only
  the first scene, so the MP4 is truncated to slide 1; use 'present').

Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>

---------

Co-authored-by: Claude Opus 4.8 (1M context) <noreply@anthropic.com>

packages/cli/src/capture/mediaCapture.ts

@@ -277,6 +277,8 @@ interface VideoDescriptor {
   src: string;
   width: number;
   height: number;
+  sourceWidth: number;
+  sourceHeight: number;
   top: number;
   left: number;
   heading: string;
@@ -315,8 +317,14 @@ const VIDEO_SCAN_EXPR = `(() => {
     if (!ariaLabel && wrapper) ariaLabel = wrapper.getAttribute('aria-label') || '';
     return {
       src: src,
+      // width/height are the DOM display box (what the page laid the element out
+      // at); sourceWidth/Height are the clip's intrinsic resolution. Size planners
+      // off the source dims, not the display box (a 1920x1080 clip can display at
+      // 904x613). 0 when metadata has not loaded yet.
       width: Math.round(rect.width),
       height: Math.round(rect.height),
+      sourceWidth: v.videoWidth || 0,
+      sourceHeight: v.videoHeight || 0,
       top: Math.round(rect.top),
       left: Math.round(rect.left),
       heading: heading,
@@ -418,6 +426,8 @@ export async function captureVideoManifest(
         filename: k,
         width: 0,
         height: 0,
+        sourceWidth: 0,
+        sourceHeight: 0,
         top: 0,
         left: 0,
         heading: "",
@@ -441,6 +451,8 @@ export async function captureVideoManifest(
     filename: string;
     width: number;
     height: number;
+    sourceWidth: number;
+    sourceHeight: number;
     heading: string;
     caption: string;
     ariaLabel: string;
@@ -508,6 +520,8 @@ export async function captureVideoManifest(
       filename: v.filename,
       width: v.width,
       height: v.height,
+      sourceWidth: v.sourceWidth,
+      sourceHeight: v.sourceHeight,
       heading: v.heading,
       caption: v.caption,
       ariaLabel: v.ariaLabel,