fix(cli): stop the CLI build looking for the removed gsap skill - #7689

Context: I've been using HyperFrames every day for the past two weeks to make Korean Shorts and long-form videos, and it's been great to work with. This PR is one of a batch of fixes for things I ran into along the way, so you'll see several PRs from me at once — sorry for the pile-up, and thanks for your patience. Each one is reproduced on current main, independent of the others, and can be reviewed, merged or closed on its own.

What

Remove the stale "gsap" entry from the list of skills packages/cli/scripts/build-copy.mjs bundles into the published CLI, and add a unit test that every name on that list has a skills/<name>/SKILL.md.

Why

Every CLI build on main prints:

$ node scripts/build-copy.mjs
[build-copy] skill not found, skipping: skills/gsap
[build-copy] done

skills/gsap was removed in #1349 (2026-06-14, "video-creation workflow suite"), which folded its content into the animation skill — the same PR that added the existsSync guard and the warning. The list was never updated, so the warning has fired on every build since and trains people to ignore build-copy warnings that might one day matter.

Related work

No existing issue or PR (searched "build-copy gsap", "skills/gsap").

How

• build-copy.mjs: ["hyperframes", "hyperframes-cli", "gsap", "media-use"] → ["hyperframes", "hyperframes-cli", "media-use"]. Nothing reads dist/skills/gsap (the directory was never produced after feat(skills): video-creation workflow suite — routable workflows #1349).
• packages/cli/src/buildCopy.test.ts: reads the script's source (as init.test.ts already does for the templates list), extracts the bundled-skill names and asserts each has a SKILL.md. The existsSync guard stays, so a branch with a different skills tree still builds; CI is what catches a stale name.

Test plan

• Unit test added: on main it fails with missing = ["gsap"]; with the fix it passes.
• Manual: node scripts/build-copy.mjs — main prints the skill not found … skills/gsap line; this branch prints only [build-copy] done, and dist/skills still holds hyperframes, hyperframes-cli, media-use (same as before).
• Documentation updated — n/a (build script only)
• Comments follow CONTRIBUTING.md "Comments"
• Gates: oxlint, oxfmt, typecheck, fallow, comment ratchet — pass.

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