build: convert repo from npm to pnpm

[DylanPiercey]

Converts the repo from npm to pnpm 11.

• Lockfile imported via pnpm import (resolved versions preserved); package-lock.json removed.
• packageManager: pnpm@11.15.1 pinned; pnpm-workspace.yaml added with allowBuilds: { esbuild: true } so esbuild's postinstall runs (pnpm 11 blocks build scripts by default).
• package.json scripts: npm-isms converted (npm run -> pnpm run, npm i --package-lock-only -> pnpm install --lockfile-only in the changesets version script).
• CI: pnpm/action-setup@v6 added before setup-node, cache: pnpm, pnpm install --frozen-lockfile; codecov-action bumped v5 -> v7.
• Husky pre-commit: npx --no-install lint-staged -> pnpm exec lint-staged.
• Ignore files updated (pnpm-lock.yaml in .prettierignore; package-lock.json/yarn.lock gitignored).

Release flow: changesets auto-detects pnpm for publish; version/release scripts updated accordingly.

Verification: clean pnpm install --frozen-lockfile, pnpm run build, pnpm run lint, and pnpm test all pass locally.

[changeset-bot]

⚠️ No Changeset found

Latest commit: cf73c16

Merging this PR will not cause a version bump for any packages. If these changes should not result in a new version, you're good to go. If these changes should result in a version bump, you need to add a changeset.

This PR includes no changesets

When changesets are added to this PR, you'll see the packages that this PR includes changesets for and the associated semver types

Click here to learn what changesets are, and how to add one.

Click here if you're a maintainer who wants to add a changeset to this PR

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Review details

⚙️ Run configuration

Configuration used: Organization UI

Review profile: CHILL

Plan: Pro

Run ID: 525448dd-bed7-4b06-83e6-4c92295d0362

📥 Commits

Reviewing files that changed from the base of the PR and between 93850d2 and cf73c16.

⛔ 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 (6)

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

✨ 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 99.95%. Comparing base (93850d2) to head (cf73c16).

Additional details and impacted files

@@           Coverage Diff           @@
##             main     #232   +/-   ##
=======================================
  Coverage   99.95%   99.95%           
=======================================
  Files          34       34           
  Lines        4270     4270           
  Branches      793      793           
=======================================
  Hits         4268     4268           
  Misses          2        2           

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