scripts: generate-cheatsheet.mjs crashes with an unhandled TypeError on a SKILL.md without leading front matter

[kyle-sexton]

Context

Found by the repo-wide /code-tidying:batch-simplify sweep (62 groups / 986 files, branch claude/repo-code-tidying-batch-twhddw). The sweep's doctrine files latent defects instead of fixing them mid-sweep, because the fix changes observable behavior; this issue is that filing.

scripts/generate-cheatsheet.mjs:76,84-86,146 — a SKILL.md missing the leading --- yields {} meta, then an unhandled TypeError instead of the named fail() path. Unreachable in the current corpus, but the failure mode is a stack trace instead of the tool's own error channel.

Proposed work

• Route the missing-front-matter case through the existing fail() with a named error.

Acceptance criteria

• A fixture SKILL.md without front matter produces the named fail() message and non-zero exit, not a TypeError.

References

• scripts/generate-cheatsheet.mjs:76

Filed by the /code-tidying:batch-simplify closeout (Phase 8).

[kyle-sexton]

This was generated by AI during work-loop.

Already fixed on main. scripts/generate-cheatsheet.mjs routes a SKILL.md whose line 1 is not --- through the named errors channel instead of throwing TypeError:

readCheatsheetMeta returns {} without a leading fence; the sweep then pushes ${key}: ${s.path} has no YAML frontmatter (line 1 is not ---) and continues (lines 142-147).

Closing as done. No further change required.