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/faceless-explainer/references/story-design.md

@@ -233,7 +233,7 @@ Use the exact fields required by the core storyboard format. This is the narrati
 - type: feature_showcase
 - persuasion: Progressive disclosure
 - beat: comprehension
-- blueprint: messaging-multi-phase — candidate shape from the role→blueprint menu; omit when none fits
+- blueprint: dataviz-countup — candidate shape from the role→blueprint menu; omit when none fits
 
 narrativeRole: What this frame does in the viewer's understanding.
 keyMessage: The one idea the viewer should remember.