fix(skills): resolve the blueprint id from a qualified blueprint: field (#3337)

* fix(skills): resolve the blueprint id from a qualified `blueprint:` field

visual-design.md documents `blueprint:` as the id plus a `(Reproduce)` /
`(Adapt)` qualifier, and prints `dataviz-countup (Adapt)` as its worked example.
The packet builder used that raw field as a filename, so a qualified blueprint
looked for `<id> (Adapt).md`, found nothing, and inlined an empty string:
`selectedFile()` returns "" for a missing path. Every packet shipped without the
one document the frame was designed against, and the run still exited 0 with
nothing on stderr. `compose (Adapt)` missed the `compose` check the same way.

Parse the field into the id it names, once, so no caller resolves a raw field
value against the blueprints directory. A blueprint that resolves to no file is
now a named error rather than an empty section, matching how the builder already
treats a missing `src` and an oversize packet.

The existing tests only used bare ids, which is how the qualified form escaped;
they now cover both, and the missing-file case.

One owner: product-launch-video, faceless-explainer, pr-to-video and
general-video all delegate to frame-packets-core.mjs.

Co-Authored-By: anikam13 <22992075+anikam13@users.noreply.github.com>

* fix(skills): degrade, not fail, when the blueprints library is absent

Self-review catch on the previous commit. hyperframes-animation installs on
demand, so its blueprints/ directory can legitimately be missing — that is a
skill that isn't installed yet, not a frame naming a bad id. Throwing there
turned a silent degrade into a hard failure for a valid setup.

Distinguish the two: an absent blueprints/ warns and inlines nothing, exactly
as an absent rules/ already does in knownRuleIds; a present library that has no
file for this id still throws, because that is a typo or an unstripped
qualifier.

Co-Authored-By: anikam13 <22992075+anikam13@users.noreply.github.com>

* fix(skills): point two dead blueprint references at real shapes

CI surfaced these once an unresolvable blueprint stopped being silent. Both
named ids that have never existed in hyperframes-animation/blueprints/:

- faceless-explainer's frame template taught `messaging-multi-phase`, so an
  agent copying the template verbatim tagged a blueprint that resolves to
  nothing. dataviz-countup is what the same skill already uses in its own
  visual-design template and tests.
- pr-to-video's diff-excerpt guardrail fixture used `number-lockup`. The test is
  about diff excerpting and the id was incidental; the frame's own
  `counting-dynamic-scale` rule makes dataviz-countup the natural real shape.

A sweep of every `blueprint:` value across skills/ finds no others.

Co-Authored-By: anikam13 <22992075+anikam13@users.noreply.github.com>

---------

Co-authored-by: anikam13 <22992075+anikam13@users.noreply.github.com>

skills/pr-to-video/scripts/workflow-guardrails.test.mjs

@@ -83,7 +83,7 @@ test("#1092 packets contain selected excerpts but never the full diff", () => {
   write(join(project, "frame.md"), "# compact frame tokens\n");
   write(
     join(project, "STORYBOARD.md"),
-    `---\nformat: 1920x1080\n---\n\n## Frame 1 — Diff\n\n- duration: 4s\n- src: compositions/frames/01-diff.html\n- focal: code-diff\n- blueprint: compose\n- rules: text-reveal\n\n### Source excerpt\n\n\`\`\`diff\n-oldCall()\n+newCall({ attested: true })\n\`\`\`\n\n## Frame 2 — Impact\n\n- duration: 3s\n- src: compositions/frames/02-impact.html\n- blueprint: number-lockup\n- rules: counting-dynamic-scale\n`,
+    `---\nformat: 1920x1080\n---\n\n## Frame 1 — Diff\n\n- duration: 4s\n- src: compositions/frames/01-diff.html\n- focal: code-diff\n- blueprint: compose\n- rules: text-reveal\n\n### Source excerpt\n\n\`\`\`diff\n-oldCall()\n+newCall({ attested: true })\n\`\`\`\n\n## Frame 2 — Impact\n\n- duration: 3s\n- src: compositions/frames/02-impact.html\n- blueprint: dataviz-countup\n- rules: counting-dynamic-scale\n`,
   );
 
   const result = buildFramePackets({