format:check fails on pre-existing source files

[smota]

Summary

pnpm format:check currently fails on many pre-existing source/script files outside the CUI change set.

Reproduction

pnpm format:check

Observed

Prettier reports code style issues in 45 existing files, including src/add.ts, src/find.ts, src/git.ts, src/skills.ts, and scripts.

Notes

Focused CUI formatting passes:

pnpm exec prettier --check README.md packages/skill-cui/README.md src/cui/README.md tests/skill-cui-package.test.ts packages/skill-cui/bin/skill-cui.mjs src/cui/**/*.ts src/cli.test.ts

Full tests and build pass:

pnpm test
pnpm build

This is recorded separately so CUI work can continue without mass-formatting unrelated files in the same PR.