chore: import upstream snapshot with attribution

skills/website-to-video/scripts/w2h-verify.mjs

@@ -0,0 +1,759 @@
+#!/usr/bin/env node
+// w2h-verify.mjs — verification report for a website-to-video project.
+//
+// Computes quality signals the agent cannot fudge. Each check is designed to
+// catch a specific failure mode observed across three real agent debriefs.
+// Result becomes the Step 6 deliverable — paste verbatim into the final
+// user-facing summary so the user sees exactly what shipped.
+//
+// Pure file analysis. No shell spawns. Run lint + inspect separately and
+// paste alongside.
+//
+// Usage:
+//   node skills/website-to-video/scripts/w2h-verify.mjs <project-dir>
+//
+// Exit codes:
+//   0 = all gates pass
+//   1 = one or more gates failed
+//   2 = script error (project-dir missing, etc.)
+
+import { readFile, readdir } from "node:fs/promises";
+import { join, resolve } from "node:path";
+import { existsSync } from "node:fs";
+
+const PROJECT_DIR = resolve(process.argv[2] || ".");
+
+// Thresholds — change here, not by interpretation.
+const HEADLINE_MIN_PX = 80; // 80px floor for primary headline at 1920×1080
+const TIMELINE_COVERAGE_MIN = 0.7; // max GSAP event position must reach ≥70% of beat duration
+const SFX_DRIFT_TOLERANCE_S = 0.1; // 3 frames at 30fps; matches step-5 evidence rule + step-6 playback floor
+const BEAT_DURATION_DRIFT_TOLERANCE_S = 0.5;
+
+const SHADER_NAMES = [
+  "cross-warp-morph",
+  "cross-warp",
+  "cinematic-zoom",
+  "gravitational-lens",
+  "glitch",
+  "light-leak",
+  "flash-through-white",
+  "whip-pan",
+  "domain-warp",
+  "thermal-bloom",
+  "swirl",
+  "ridged-noise",
+  "sdf-reveal",
+  "chromatic-aberration",
+  "ripple",
+];
+
+// ─── Main ────────────────────────────────────────────────────────────────────
+
+async function main() {
+  if (!existsSync(PROJECT_DIR)) {
+    console.error(`✗ Project directory not found: ${PROJECT_DIR}`);
+    process.exit(2);
+  }
+
+  const results = [];
+  results.push(await checkRequiredArtifacts());
+  results.push(await checkBrandVisualsUsed());
+  results.push(await checkPerBeatHeadlineSize());
+  results.push(await checkPerBeatTimelineCoverage());
+  results.push(await checkShaderTransitionsConsistency());
+  results.push(await checkSfxTimestampConsistency());
+  results.push(await checkBeatDurationConsistency());
+  results.push(await checkMp4Exists());
+
+  printReport(results);
+
+  const anyFail = results.some((r) => r.status === "FAIL");
+  process.exit(anyFail ? 1 : 0);
+}
+
+// ─── Checks ──────────────────────────────────────────────────────────────────
+
+async function checkRequiredArtifacts() {
+  const required = ["STORYBOARD.md", "DESIGN.md", "SCRIPT.md", "index.html"];
+  const missing = required.filter((f) => !existsSync(join(PROJECT_DIR, f)));
+  if (missing.length === 0) {
+    return { name: "Required artifacts", status: "PASS", detail: required.join(", ") };
+  }
+  return {
+    name: "Required artifacts",
+    status: "FAIL",
+    detail: `missing: ${missing.join(", ")}`,
+  };
+}
+
+// Catches the biggest failure mode: agent uses only the logo and rebuilds
+// every "hero illustration" from CSS, ignoring the brand's actual visual identity.
+async function checkBrandVisualsUsed() {
+  const compositions = await readBeatCompositions();
+  if (compositions.length === 0) {
+    return { name: "Brand visuals used", status: "INFO", detail: "no beat compositions found" };
+  }
+
+  // A "brand visual" is anything captured under capture/assets/ that ISN'T:
+  //   - a font file
+  //   - a logo file (filename contains "logo")
+  //   - a favicon / apple-touch-icon
+  // i.e., hero-*.jpg, image-*.png, illustrations, photographs, svgs/<icons>.svg
+  const brandRegex =
+    /capture\/assets\/(?!fonts\/)(?:svgs\/)?(?!.*(?:logo|favicon|apple-touch-icon))[\w-]+\.(?:jpg|jpeg|png|svg|webp|gif)/gi;
+  const beatsUsingBrand = [];
+  for (const beat of compositions) {
+    const matches = beat.content.match(brandRegex) || [];
+    if (matches.length > 0) {
+      beatsUsingBrand.push({ beat: beat.name, count: new Set(matches).size });
+    }
+  }
+
+  const pass = beatsUsingBrand.length >= 1;
+  if (pass) {
+    return {
+      name: "Brand visuals used",
+      status: "PASS",
+      detail: `${beatsUsingBrand.length}/${compositions.length} beats reference a hero/image/svg captured asset`,
+      extra:
+        beatsUsingBrand.length === 1
+          ? "Only 1 beat uses a captured visual — consider whether the brand's hero illustrations or signature graphics fit other beats too."
+          : null,
+    };
+  }
+  return {
+    name: "Brand visuals used",
+    status: "FAIL",
+    detail: `0/${compositions.length} beats reference any hero-*/image-*/svgs/ captured asset (logo doesn't count)`,
+    extra:
+      "Open capture/assets/contact-sheet-*.jpg and capture/assets/svgs/contact-sheet-*.jpg. The brand's actual visuals are sitting there. Rebuilding them in CSS erases what makes the brand recognizable.",
+  };
+}
+
+// Catches "headlines too small to read" — inspect typically catches the
+// overflow afterward, but this catches the cause earlier.
+async function checkPerBeatHeadlineSize() {
+  const compositions = await readBeatCompositions();
+  if (compositions.length === 0) {
+    return { name: "Headline font-size", status: "INFO", detail: "no beat compositions found" };
+  }
+
+  // Only flag beats where the LARGEST font-size is in the "aspiring headline
+  // but too small" range (40–<80px). Below 40px = the beat has no headline by
+  // design (UI labels, code text, decorative). ≥80px = proper headline.
+  // This skips legitimate non-headline beats (terminal beats, SVG-only beats,
+  // pure-image beats) without losing the real "headline too small" signal.
+  const HEADLINE_FLOOR_FOR_CHECK = 40;
+  const offenders = [];
+  const skipped = [];
+  for (const beat of compositions) {
+    const sizes = [...beat.content.matchAll(/font-size:\s*(\d+(?:\.\d+)?)px/g)].map((m) =>
+      parseFloat(m[1]),
+    );
+    if (sizes.length === 0) {
+      skipped.push({ beat: beat.name, reason: "no font-size declared" });
+      continue;
+    }
+    const max = Math.max(...sizes);
+    if (max < HEADLINE_FLOOR_FOR_CHECK) {
+      skipped.push({ beat: beat.name, reason: `largest font is ${max}px — no headline by design` });
+      continue;
+    }
+    if (max < HEADLINE_MIN_PX) {
+      offenders.push({ beat: beat.name, maxSize: max });
+    }
+  }
+
+  const pass = offenders.length === 0;
+  const checked = compositions.length - skipped.length;
+  return {
+    name: "Headline font-size",
+    status: pass ? "PASS" : "FAIL",
+    detail: pass
+      ? `${checked}/${compositions.length} beats with a headline-sized text element, all ≥${HEADLINE_MIN_PX}px`
+      : `${offenders.length} beat(s) with headline-sized text below ${HEADLINE_MIN_PX}px floor`,
+    extra: pass
+      ? null
+      : [
+          ...offenders.map((o) => `${o.beat}: largest font-size is ${o.maxSize}px`),
+          ...(skipped.length > 0
+            ? [
+                `(skipped ${skipped.length} beat(s) with no headline-sized text: ${skipped.map((s) => s.beat).join(", ")})`,
+              ]
+            : []),
+        ].join("\n  "),
+  };
+}
+
+// Catches "webpage not shot" failures — entrance tweens in the first second
+// then nothing. Snapshots look fine (static end state) but motion is dead.
+async function checkPerBeatTimelineCoverage() {
+  const compositions = await readBeatCompositions();
+  const beatDurations = await readBeatDurationsFromIndex();
+  if (compositions.length === 0) {
+    return { name: "Timeline coverage", status: "INFO", detail: "no beat compositions found" };
+  }
+
+  const offenders = [];
+  const skipped = [];
+  // Pattern detectors: beats that use these idioms have events at positions
+  // the static parser can't read (loop iterators, variable arithmetic).
+  // Don't flag them as "webpage not shot" — they have events the parser
+  // simply can't see. Note: single-tween yoyo/repeat is NOT enough to skip
+  // — it only oscillates one element, not the whole beat.
+  const dynamicPatterns = [
+    {
+      name: "forEach with tweens",
+      re: /\.forEach\s*\([^{]*\{[\s\S]{0,2000}?\btl\.(?:to|set|fromTo|from)\(/,
+    },
+    {
+      name: "for-loop with tweens",
+      re: /\bfor\s*\([^)]*\)\s*\{[\s\S]{0,2000}?\btl\.(?:to|set|fromTo|from)\(/,
+    },
+  ];
+
+  for (const beat of compositions) {
+    const beatId = beat.name.replace(/\.html$/, "");
+    const dur = beatDurations[beatId] ?? beatDurations[beat.name];
+    if (!dur) {
+      skipped.push({ beat: beat.name, reason: "no data-duration in index.html" });
+      continue;
+    }
+
+    // Check for dynamic patterns first — if present, coverage cannot be
+    // statically determined; treat as informational, not a failure.
+    const matchedDynamic = dynamicPatterns.find((p) => p.re.test(beat.content));
+    if (matchedDynamic) {
+      skipped.push({
+        beat: beat.name,
+        reason: `dynamic event pattern detected (${matchedDynamic.name}) — coverage not statically measurable`,
+      });
+      continue;
+    }
+
+    // Long-duration tween check: if there's a tween with duration ≥ 70% of
+    // beat duration, that single tween covers the whole beat — likely a
+    // camera dolly, breathing animation, or persistent motion. Skip the
+    // position-based coverage check.
+    const durationRe = /\btl\.(?:to|set|fromTo|from)\([\s\S]{0,500}?duration:\s*([0-9.]+)/g;
+    let dm;
+    let hasLongTween = false;
+    let longTweenDur = 0;
+    while ((dm = durationRe.exec(beat.content)) !== null) {
+      const d = parseFloat(dm[1]);
+      if (d >= dur * TIMELINE_COVERAGE_MIN) {
+        hasLongTween = true;
+        longTweenDur = d;
+        break;
+      }
+    }
+    if (hasLongTween) {
+      skipped.push({
+        beat: beat.name,
+        reason: `long-duration tween covers ${longTweenDur.toFixed(2)}s of ${dur.toFixed(2)}s beat — full coverage via persistent motion`,
+      });
+      continue;
+    }
+
+    // Extract GSAP event positions for static cases.
+    // Use balanced-paren scanning so multi-line calls and rgba(...) values
+    // inside option objects don't false-match.
+    const positions = extractTopLevelPositionArgs(beat.content);
+    if (positions.length === 0) {
+      offenders.push({ beat: beat.name, reason: "no GSAP events with explicit position found" });
+      continue;
+    }
+
+    const maxPos = Math.max(...positions);
+    const coverage = maxPos / dur;
+    if (coverage < TIMELINE_COVERAGE_MIN) {
+      offenders.push({
+        beat: beat.name,
+        reason: `static events span 0–${maxPos.toFixed(2)}s of ${dur.toFixed(2)}s beat (${Math.round(coverage * 100)}%)`,
+      });
+    }
+  }
+
+  const pass = offenders.length === 0;
+  const checked = compositions.length - skipped.length;
+  return {
+    name: "Timeline coverage",
+    status: pass ? "PASS" : "FAIL",
+    detail: pass
+      ? `${checked}/${compositions.length} statically-measurable beats span ≥${Math.round(TIMELINE_COVERAGE_MIN * 100)}% of duration`
+      : `${offenders.length} beat(s) below ${Math.round(TIMELINE_COVERAGE_MIN * 100)}% static coverage — likely "webpage not shot" failures`,
+    extra:
+      [
+        ...offenders.map((o) => `${o.beat}: ${o.reason}`),
+        ...(skipped.length > 0 ? skipped.map((s) => `(skipped ${s.beat}: ${s.reason})`) : []),
+      ].join("\n  ") || null,
+  };
+}
+
+async function checkShaderTransitionsConsistency() {
+  const storyboardPath = join(PROJECT_DIR, "STORYBOARD.md");
+  const indexPath = join(PROJECT_DIR, "index.html");
+  if (!existsSync(storyboardPath) || !existsSync(indexPath)) {
+    return {
+      name: "Shader transitions",
+      status: "INFO",
+      detail: "STORYBOARD.md or index.html missing — cannot check",
+    };
+  }
+
+  const storyboard = await readFile(storyboardPath, "utf-8");
+  const index = await readFile(indexPath, "utf-8");
+
+  // For each shader name, count it as "declared" only if it appears in a
+  // transition-use context — NOT in an inventory list (3+ names on one line)
+  // and NOT exclusively as part of an SFX filename (sfx/glitch-1.mp3).
+  const sbLines = storyboard.split("\n");
+  // Longest-name matching to avoid substring double-counting.
+  const sortedNames = [...SHADER_NAMES].sort((a, b) => b.length - a.length);
+  const seen = new Set();
+  const declared = [];
+  for (const name of sortedNames) {
+    let foundInUseContext = false;
+    for (const line of sbLines) {
+      if (seen.has(name)) break;
+      if (!line.includes(name)) continue;
+      // Skip inventory listing lines (3+ shader names on one line).
+      const namesOnLine = SHADER_NAMES.filter((n) => line.includes(n)).length;
+      if (namesOnLine >= 3) continue;
+      // Skip lines where the shader name only appears in SFX filename context.
+      const sfxContext = line.includes(`sfx/${name}`) || line.includes(`sfx-${name}`);
+      // Count this name if it appears in a non-SFX, non-inventory line.
+      if (!sfxContext) {
+        foundInUseContext = true;
+        break;
+      }
+    }
+    if (foundInUseContext) {
+      declared.push(name);
+      seen.add(name);
+    }
+  }
+  if (declared.length === 0) {
+    return {
+      name: "Shader transitions",
+      status: "PASS",
+      detail: "STORYBOARD declared none — no shader transitions expected",
+    };
+  }
+
+  // A shader is "present" only if HyperShader runtime is in index.html AND the
+  // shader name appears in a line that is NOT an SFX reference.
+  const hasHyperShader = /HyperShader\s*[(.]/.test(index);
+  const indexLines = index.split("\n");
+  const present = !hasHyperShader
+    ? []
+    : declared.filter((name) =>
+        indexLines.some((line) => {
+          if (!line.includes(name)) return false;
+          if (line.includes(`sfx/${name}`) || line.includes(`sfx-${name}`)) return false;
+          return true;
+        }),
+      );
+  const missing = declared.filter((name) => !present.includes(name));
+  const pass = missing.length === 0;
+
+  return {
+    name: "Shader transitions",
+    status: pass ? "PASS" : "FAIL",
+    detail: `STORYBOARD declared ${declared.length}, ${present.length} present in index.html, ${missing.length} missing`,
+    extra: pass
+      ? null
+      : `Missing from build: ${missing.join(", ")}. STORYBOARD.md and index.html disagree — either re-add the transitions or update STORYBOARD.md.`,
+  };
+}
+
+async function checkSfxTimestampConsistency() {
+  const storyboardPath = join(PROJECT_DIR, "STORYBOARD.md");
+  const indexPath = join(PROJECT_DIR, "index.html");
+  if (!existsSync(storyboardPath) || !existsSync(indexPath)) {
+    return {
+      name: "SFX timestamps",
+      status: "INFO",
+      detail: "STORYBOARD.md or index.html missing",
+    };
+  }
+
+  const storyboard = await readFile(storyboardPath, "utf-8");
+  const index = await readFile(indexPath, "utf-8");
+
+  const sfxRefs = [];
+  for (const line of storyboard.split("\n")) {
+    const fileMatch = line.match(/sfx\/([\w-]+\.mp3)/);
+    // Require trailing `s` so we capture the time column, not the volume column.
+    const timeMatch = line.match(/\|\s*(\d+(?:\.\d+)?)s\b/);
+    if (fileMatch && timeMatch) {
+      sfxRefs.push({ file: fileMatch[1], storyboardT: parseFloat(timeMatch[1]) });
+    }
+  }
+
+  if (sfxRefs.length === 0) {
+    return {
+      name: "SFX timestamps",
+      status: "INFO",
+      detail: "No SFX entries detected in STORYBOARD.md",
+    };
+  }
+
+  // Collect ALL audio tags per file (multi-timestamp SFX like click.mp3 have
+  // 3 tags). Use a two-step extraction so we don't depend on src= and
+  // data-start= attribute ordering — the documented canonical pattern in
+  // capabilities.md puts src= LAST in the tag, which an order-dependent
+  // regex would miss → false MISSING reports.
+  const indexSfx = new Map();
+  const audioTagRegex = /<audio[^>]*?>/g;
+  let tagMatch;
+  while ((tagMatch = audioTagRegex.exec(index)) !== null) {
+    const tag = tagMatch[0];
+    const srcMatch = tag.match(/src=["'](?:[^"']*\/)?sfx\/([\w-]+\.mp3)["']/);
+    const dsMatch = tag.match(/data-start=["']([0-9.]+)["']/);
+    if (!srcMatch || !dsMatch) continue;
+    const file = srcMatch[1];
+    const t = parseFloat(dsMatch[1]);
+    if (!indexSfx.has(file)) indexSfx.set(file, []);
+    indexSfx.get(file).push(t);
+  }
+
+  const drifts = [];
+  const missing = [];
+  for (const ref of sfxRefs) {
+    if (!indexSfx.has(ref.file)) {
+      missing.push(ref.file);
+      continue;
+    }
+    const indexTs = indexSfx.get(ref.file);
+    const closest = indexTs.reduce((best, t) =>
+      Math.abs(t - ref.storyboardT) < Math.abs(best - ref.storyboardT) ? t : best,
+    );
+    const drift = Math.abs(closest - ref.storyboardT);
+    if (drift > SFX_DRIFT_TOLERANCE_S) {
+      drifts.push({ file: ref.file, storyboardT: ref.storyboardT, indexT: closest, drift });
+    }
+  }
+
+  const indexCount = [...indexSfx.values()].reduce((sum, arr) => sum + arr.length, 0);
+  const pass = missing.length === 0 && drifts.length === 0;
+  return {
+    name: "SFX timestamps",
+    status: pass ? "PASS" : "FAIL",
+    detail: `${sfxRefs.length} SFX in STORYBOARD · ${indexCount} in index.html · ${missing.length} missing · ${drifts.length} drifted >${SFX_DRIFT_TOLERANCE_S}s`,
+    extra: pass
+      ? null
+      : [
+          ...missing.map((f) => `MISSING in index.html: ${f}`),
+          ...drifts.map(
+            (d) =>
+              `DRIFT: ${d.file} storyboard=${d.storyboardT}s closest index=${d.indexT}s drift=${d.drift.toFixed(2)}s`,
+          ),
+        ].join("\n  "),
+  };
+}
+
+// Catches storyboard staleness on beat timings — agent shipped with different
+// beat durations than the storyboard documented, leaving the spec lying.
+async function checkBeatDurationConsistency() {
+  const storyboardPath = join(PROJECT_DIR, "STORYBOARD.md");
+  if (!existsSync(storyboardPath)) {
+    return { name: "Beat durations", status: "INFO", detail: "STORYBOARD.md missing" };
+  }
+
+  const storyboard = await readFile(storyboardPath, "utf-8");
+  const indexDurations = await readBeatDurationsFromIndex();
+  // Filter to only numbered beats (beat-1, beat-2, ...). Skip "main" / root
+  // composition and any non-numbered placeholders.
+  const buildBeatIds = Object.keys(indexDurations).filter((id) => /^beat-\d+/i.test(id));
+  if (buildBeatIds.length === 0) {
+    return {
+      name: "Beat durations",
+      status: "INFO",
+      detail: "no numbered beat data-duration in index.html",
+    };
+  }
+
+  // Parse storyboard beat durations. The expected pattern is a timing-table row:
+  //   | B4 — MetaBrain | 16.600 – 21.000s | ... |
+  // We extract start–end and compute duration = end - start. Falls back to a
+  // direct duration mention ("duration: X.Xs") if the range format isn't found.
+  // A beat with no parseable duration is skipped — we don't flag missing rows.
+  const drifts = [];
+  const unparseable = [];
+  for (const beatId of buildBeatIds) {
+    const num = beatId.match(/beat-(\d+)/i)?.[1];
+    if (!num) continue;
+    let storyT = null;
+
+    // Strategy 1: standalone beat row "B4 — Name | 16.600 – 21.000s |".
+    // Require `B${num}` to be followed by a non-digit-non-dot char so "B3.1"
+    // doesn't false-match for B3.
+    const rangeRe = new RegExp(
+      `\\bB${num}(?![\\.\\d])[^\\n|]*\\|\\s*(\\d+(?:\\.\\d+)?)s?\\s*[–-]\\s*(\\d+(?:\\.\\d+)?)s`,
+      "i",
+    );
+    const rm = storyboard.match(rangeRe);
+    if (rm) {
+      storyT = parseFloat(rm[2]) - parseFloat(rm[1]);
+    } else {
+      // Strategy 2: sum sub-beats "B${num}.X — ... | start – end s |".
+      // Useful when a beat is broken into sub-rows (B3.1, B3.2, ...) instead
+      // of having a standalone row.
+      const subRe = new RegExp(
+        `\\bB${num}\\.\\d+\\b[^\\n|]*\\|\\s*(\\d+(?:\\.\\d+)?)s?\\s*[–-]\\s*(\\d+(?:\\.\\d+)?)s`,
+        "gi",
+      );
+      let sum = 0;
+      let count = 0;
+      let mm;
+      while ((mm = subRe.exec(storyboard)) !== null) {
+        sum += parseFloat(mm[2]) - parseFloat(mm[1]);
+        count++;
+      }
+      if (count > 0) storyT = sum;
+    }
+
+    if (storyT === null) {
+      // Strategy 3: bare-number timing table — "| 1 | 0.00s | 5.20s | 5.20s |"
+      // (Beat | Start | End | Duration). The duration column is the 4th cell,
+      // OR derive from end - start (columns 2 and 3). Match a row that starts
+      // with `| <num> |` and has at least 2 time cells.
+      // Allow optional leading `>` (blockquote) before the pipe.
+      const tableRe = new RegExp(
+        `^\\s*>?\\s*\\|\\s*${num}\\s*\\|\\s*(\\d+(?:\\.\\d+)?)s?\\s*\\|\\s*(\\d+(?:\\.\\d+)?)s`,
+        "im",
+      );
+      const tm = storyboard.match(tableRe);
+      if (tm) {
+        const start = parseFloat(tm[1]);
+        const end = parseFloat(tm[2]);
+        storyT = end - start;
+      }
+    }
+    // Note: removed the previous "duration: X.Xs near beat label" fallback —
+    // it false-matched non-beat durations (e.g., "shader runs — duration 0.7s"
+    // near a "Beat 1" mention). If a storyboard's timing format isn't a clean
+    // range or table row, the beat is reported as unparseable rather than
+    // guessed at.
+
+    if (storyT === null) {
+      unparseable.push(beatId);
+      continue;
+    }
+    const buildT = indexDurations[beatId];
+    const drift = Math.abs(storyT - buildT);
+    if (drift > BEAT_DURATION_DRIFT_TOLERANCE_S) {
+      drifts.push({ beat: beatId, storyboardDuration: storyT, buildDuration: buildT, drift });
+    }
+  }
+
+  const parseable = buildBeatIds.length - unparseable.length;
+  if (drifts.length === 0) {
+    return {
+      name: "Beat durations",
+      status: "PASS",
+      detail: `${parseable}/${buildBeatIds.length} beats parseable, storyboard durations match within ±${BEAT_DURATION_DRIFT_TOLERANCE_S}s`,
+      extra:
+        unparseable.length > 0
+          ? `(skipped: ${unparseable.join(", ")} — could not find duration in STORYBOARD.md)`
+          : null,
+    };
+  }
+  return {
+    name: "Beat durations",
+    status: "FAIL",
+    detail: `${drifts.length} beat(s) drift between STORYBOARD.md and index.html > ${BEAT_DURATION_DRIFT_TOLERANCE_S}s`,
+    extra: [
+      ...drifts.map(
+        (d) =>
+          `${d.beat}: storyboard=${d.storyboardDuration.toFixed(2)}s build=${d.buildDuration}s drift=${d.drift.toFixed(2)}s`,
+      ),
+      ...(unparseable.length > 0
+        ? [`(skipped: ${unparseable.join(", ")} — could not find duration in STORYBOARD.md)`]
+        : []),
+    ].join("\n  "),
+  };
+}
+
+async function checkMp4Exists() {
+  const candidates = [PROJECT_DIR, join(PROJECT_DIR, "output"), join(PROJECT_DIR, "renders")];
+  for (const dir of candidates) {
+    if (!existsSync(dir)) continue;
+    try {
+      const files = await readdir(dir);
+      if (files.some((f) => f.endsWith(".mp4"))) {
+        return {
+          name: "Rendered MP4",
+          status: "PASS",
+          detail: `found .mp4 in ${dir.replace(PROJECT_DIR, ".")}`,
+        };
+      }
+    } catch {
+      /* ignore */
+    }
+  }
+  return {
+    name: "Rendered MP4",
+    status: "INFO",
+    detail:
+      "no .mp4 found — preview-only delivery; if claiming verified motion, render is required (Path 2 of audio+motion verification)",
+  };
+}
+
+// ─── Helpers ─────────────────────────────────────────────────────────────────
+
+// Cached so multiple checks don't re-read the same files. The script is a
+// one-shot CLI so a process-scoped cache is fine; no invalidation needed.
+let _compositionsCache = null;
+async function readBeatCompositions() {
+  if (_compositionsCache) return _compositionsCache;
+  const dir = join(PROJECT_DIR, "compositions");
+  if (!existsSync(dir)) {
+    _compositionsCache = [];
+    return _compositionsCache;
+  }
+  const files = await readdir(dir);
+  const beats = files.filter((f) => /^beat-/i.test(f) && f.endsWith(".html"));
+  const out = [];
+  for (const f of beats) {
+    const content = await readFile(join(dir, f), "utf-8");
+    out.push({ name: f, content });
+  }
+  _compositionsCache = out;
+  return out;
+}
+
+// Extract the trailing numeric position argument from each `tl.<method>(...)`
+// call in a script. Uses balanced-paren scanning so multi-line calls and
+// nested patterns like rgba(86,131,218,0.35) don't false-match.
+function extractTopLevelPositionArgs(content) {
+  const positions = [];
+  const methodRe = /\btl\.(?:to|set|fromTo|from|call|add)\(/g;
+  let startMatch;
+  while ((startMatch = methodRe.exec(content)) !== null) {
+    let i = startMatch.index + startMatch[0].length;
+    let depth = 1;
+    let lastTopLevelCommaIdx = -1;
+    let inString = false;
+    let stringChar = null;
+    while (i < content.length && depth > 0) {
+      const c = content[i];
+      if (inString) {
+        if (c === "\\") {
+          i += 2;
+          continue;
+        }
+        if (c === stringChar) inString = false;
+        i++;
+        continue;
+      }
+      if (c === '"' || c === "'" || c === "`") {
+        inString = true;
+        stringChar = c;
+        i++;
+        continue;
+      }
+      if (c === "(" || c === "{" || c === "[") depth++;
+      else if (c === ")" || c === "}" || c === "]") {
+        depth--;
+        if (depth === 0) break;
+      } else if (c === "," && depth === 1) lastTopLevelCommaIdx = i;
+      i++;
+    }
+    if (depth === 0 && lastTopLevelCommaIdx > 0) {
+      const lastArg = content.substring(lastTopLevelCommaIdx + 1, i).trim();
+      const numMatch = lastArg.match(/^([0-9.]+)$/);
+      if (numMatch) positions.push(parseFloat(numMatch[1]));
+    }
+  }
+  return positions;
+}
+
+// Returns a map of { "beat-1-name": durationInSeconds, ... } from index.html.
+// Cached per-process (one-shot CLI, no invalidation needed).
+let _beatDurationsCache = null;
+async function readBeatDurationsFromIndex() {
+  if (_beatDurationsCache) return _beatDurationsCache;
+  const indexPath = join(PROJECT_DIR, "index.html");
+  if (!existsSync(indexPath)) {
+    _beatDurationsCache = {};
+    return _beatDurationsCache;
+  }
+  const content = await readFile(indexPath, "utf-8");
+  const map = {};
+
+  // Pattern: <div data-composition-id="beat-N-name" ... data-duration="5.5" ...>
+  // OR: data-composition-src="compositions/beat-N-name.html" ... data-duration="5.5"
+  const divRegex = /<div[^>]*?>/g;
+  let m;
+  while ((m = divRegex.exec(content)) !== null) {
+    const tag = m[0];
+    const idMatch = tag.match(/data-composition-id=["']([^"']+)["']/);
+    const srcMatch = tag.match(/data-composition-src=["'][^"']*?\/?(beat-[\w-]+)\.html["']/);
+    const durMatch = tag.match(/data-duration=["']([0-9.]+)["']/);
+    if (!durMatch) continue;
+    const dur = parseFloat(durMatch[1]);
+    if (idMatch) map[idMatch[1]] = dur;
+    if (srcMatch) map[srcMatch[1]] = dur;
+  }
+  _beatDurationsCache = map;
+  return map;
+}
+
+// ─── Report ──────────────────────────────────────────────────────────────────
+
+function printReport(results) {
+  const cols = { name: 26, status: 8, detail: 60 };
+  const line = "─".repeat(cols.name + cols.status + cols.detail + 6);
+
+  console.log("");
+  console.log(`w2h-verify · ${PROJECT_DIR}`);
+  console.log(line);
+  console.log("Check".padEnd(cols.name) + " │ " + "Status".padEnd(cols.status) + " │ " + "Detail");
+  console.log(line);
+
+  for (const r of results) {
+    const symbol = r.status === "PASS" ? "✓" : r.status === "FAIL" ? "✗" : "·";
+    console.log(
+      r.name.padEnd(cols.name) +
+        " │ " +
+        `${symbol} ${r.status}`.padEnd(cols.status) +
+        " │ " +
+        (r.detail || ""),
+    );
+    if (r.extra) {
+      const indent = " ".repeat(cols.name + cols.status + 6 + 4);
+      console.log(
+        "".padEnd(cols.name) +
+          " │ " +
+          "".padEnd(cols.status) +
+          " │   " +
+          r.extra.split("\n").join("\n" + indent),
+      );
+    }
+  }
+
+  console.log(line);
+  const pass = results.filter((r) => r.status === "PASS").length;
+  const fail = results.filter((r) => r.status === "FAIL").length;
+  const info = results.filter((r) => r.status === "INFO").length;
+  console.log(`SUMMARY: ${pass} PASS · ${fail} FAIL · ${info} INFO`);
+
+  if (fail > 0) {
+    console.log("");
+    console.log("Step 6 NOT done. Fix FAIL items, OR include this report verbatim in your final");
+    console.log("summary's \"What I did NOT verify\" section so the user knows what's broken.");
+  } else {
+    console.log("");
+    console.log(
+      "All gates pass. Paste this report into your final user-facing summary as evidence.",
+    );
+  }
+  console.log("");
+}
+
+main().catch((e) => {
+  console.error("w2h-verify script error:", e);
+  process.exit(2);
+});