chore(internals): cover skill validation error paths

[cursor]

Selected task

Coverage for projects/internals/tools/src/skills/utils.ts.

Selector rationale: "5 uncovered lines, 94.18% lines and 81.39% branches, the smallest gap below the 90% threshold".

Measurement

	Lines	Branches
Before	81/86 (94.18%)	35/43 (81.39%)
After	86/86 (100%)	43/43 (100%)

Added unit tests in utils.test.ts for the public validation surface: directory basename mismatch, empty title, empty files, non-string file content, frontmatter/registry mismatch, and the default skills registry argument.

Public API

No public API changed. Production code is unmodified.

Left alone

• No production edits, including leaving the typeof content !== 'string' runtime check in place (it is now covered rather than deleted).
• Did not touch visual baselines, other packages, or ESLint suppressions.

Validation

• projects/internals/tools: lint pass, test pass (741 tests), test:coverage pass
• test:types, test:axe, test:ssr, test:lighthouse, test:visual: not defined for this package
• Root pnpm run ci pass

  

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