build: convert repo from npm to pnpm

[DylanPiercey]

• Replace package-lock.json with pnpm-lock.yaml (generated via pnpm import)
• Add "packageManager": "pnpm@11.15.1" to package.json
• Convert npm-isms in package.json scripts and the husky pre-commit hook
• CI: add pnpm/action-setup@v6, cache: pnpm, pnpm install --frozen-lockfile, bump codecov-action to v7
• Ignore yarn.lock; exclude pnpm-lock.yaml from prettier

Verified locally with pnpm 11.15.1: clean install, build, lint, and all 31 tests pass.

[changeset-bot]

⚠️ No Changeset found

Latest commit: 90942ba

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Configuration used: Organization UI

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📥 Commits

Reviewing files that changed from the base of the PR and between 8c13deb and 90942ba.

⛔ Files ignored due to path filters (2)

• package-lock.json is excluded by !**/package-lock.json and included by **
• pnpm-lock.yaml is excluded by !**/pnpm-lock.yaml and included by **

📒 Files selected for processing (5)

• .github/workflows/ci.yml
• .gitignore
• .husky/pre-commit
• .prettierignore
• package.json

✨ Finishing Touches

🧪 Generate unit tests (beta)

• Create PR with unit tests
• Commit unit tests in branch dpiercey-ws-pnpm-0rjo9g

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[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 65.42%. Comparing base (8c13deb) to head (90942ba).

Additional details and impacted files

@@           Coverage Diff           @@
##             main      #33   +/-   ##
=======================================
  Coverage   65.42%   65.42%           
=======================================
  Files           3        3           
  Lines         188      188           
  Branches       50       50           
=======================================
  Hits          123      123           
  Misses         44       44           
  Partials       21       21           

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