chore: clear tsbuildinfo in clean script

[jherr]

npm run clean removes dist/ but leaves tsconfig.build.tsbuildinfo behind. tsc --incremental decides what to emit from that file alone, not from what's actually on disk — so the next npm run build sees an up-to-date cache and emits nothing. No dist/, no error, no output.

Reproduced on main today:

npm run build   # dist has 1097 files
npm run clean   # dist gone, tsconfig.build.tsbuildinfo still there
npm run build   # dist has 0 files

With this change the second build repopulates dist/ normally (verified: 1068 → clean → 1068).

tsconfig.tsbuildinfo (from the typecheck-only project) is included for the same reason.

Also updates the now-stale npm run clean line in CLAUDE.md.

chore: rather than fix: — dev-only script, nothing user-visible.

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Split out of #8453, which bundled this with unrelated work.

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📥 Commits

Reviewing files that changed from the base of the PR and between 97fd77d and 7475969.

📒 Files selected for processing (2)

• CLAUDE.md
• package.json

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• netlify/blueprints (manual)

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📝 Summary

Summary by CodeRabbit

• Chores
  • The clean command now removes TypeScript build cache files in addition to the build output directory.
• Documentation
  • Updated the development documentation to accurately describe everything removed by the clean command.

Walkthrough

The clean npm script now removes tsconfig.build.tsbuildinfo and tsconfig.tsbuildinfo in addition to dist/. The CLAUDE.md description now documents this behavior.

Estimated code review effort: 1 (Trivial) | ~2 minutes

Merge Risk: ⚪ Minimal · up to 74759

Cleaning now clears TypeScript incremental build caches as documented, preventing stale cache state from suppressing rebuilt output. The change is ready to merge.

Suggested reviewers: serhalp

🚥 Pre-merge checks | ✅ 5

✅ Passed checks (5 passed)

Check name	Status	Explanation
Description check	✅ Passed	The description clearly explains the clean script change, the incremental build issue, the verification, and the documentation update.
Title check	✅ Passed	The title clearly and concisely identifies the main change: removing TypeScript build-info files in the clean script.
Docstring Coverage	✅ Passed	No functions found in the changed files to evaluate docstring coverage. Skipping docstring coverage check. Docstring coverage is scoped to functions touched by this diff. Analyzed 0 functions across 0…
Linked Issues check	✅ Passed	Check skipped because no linked issues were found for this pull request.
Out of Scope Changes check	✅ Passed	Check skipped because no linked issues were found for this pull request.

Full details: Docstring Coverage

Explanation

No functions found in the changed files to evaluate docstring coverage. Skipping docstring coverage check. Docstring coverage is scoped to functions touched by this diff. Analyzed 0 functions across 0 files. (2 skipped: 2 unsupported.)

✨ Finishing Touches

🧪 Generate unit tests (beta)

• Create PR with unit tests
• Commit unit tests in branch chore/clean-tsbuildinfo

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commit: 7475969

[serhalp]

@jherr I think we should just scrap incremental compilation. It isn't worth the complexity here: #8469.