feat(skills): add composition-structure block + soft-warn feedback lint

Extend the CLI feedback reproduction packet (#2498) with a fifth
mandated field, `COMPOSITION_STRUCTURE:`, and enforce presence of
`REPRO COMMAND:` / `COMPOSITION_STRUCTURE:` at feedback-submit time.

- Skill + reference now specify `COMPOSITION_STRUCTURE:` — a
  privacy-preserving structural anatomy (element census + attribute
  presence + timeline shape + delta + defect location) — required for
  any rating <=7 that describes a visual defect.
- `buildCompositionCensus()` + `renderCompositionCensusBlock()`
  auto-fill the block from composition HTML so agents don't ask the
  human user to hand-count `<video>` / `<img>` / sub-comp mounts.
  Counts + presence flags only — no file paths, no src URLs, no user
  text.
- `hyperframes feedback` soft-warns (never blocks) when a non-10
  `--comment` is missing `REPRO COMMAND:`, and when a rating-<=7
  visual-defect comment is missing `COMPOSITION_STRUCTURE:`. The
  warning points at the auto-census helper so agents remediate
  themselves.
- `coreSkillContent.test.ts` locks the new literal in both the skill
  and the reference file, following #2498's pattern.

Extends #2498. Follow-up: no change to `doctorSummary` generation, no
change to the feedback-submission API endpoint, no refactor of
#2498's doc-content Jest test.

Signed-off-by: Via

packages/cli/src/commands/coreSkillContent.test.ts

@@ -35,6 +35,20 @@ describe("hyperframes-core contract docs", () => {
     expect(renderReference).toContain("OUTCOME:");
     expect(renderReference).toContain("WORKAROUND:");
   });
+
+  it("mandates a composition-structure block for visual-defect feedback", () => {
+    const skill = read("skills", "hyperframes-cli", "SKILL.md");
+    const renderReference = read("skills", "hyperframes-cli", "references", "preview-render.md");
+
+    // Skill teaches the mandate at a high level.
+    expect(skill).toContain("COMPOSITION_STRUCTURE:");
+    // Reference carries the fillable block + agent-helper pointer.
+    expect(renderReference).toContain("COMPOSITION_STRUCTURE:");
+    expect(renderReference).toContain("elements: video=");
+    expect(renderReference).toContain("attributes:");
+    expect(renderReference).toContain("timeline:");
+    expect(renderReference).toContain("buildCompositionCensus");
+  });
 });
 
 describe("media-use TTS documentation", () => {