Untrack 37 node_modules symlinks committed to the repo

[ManningWorks]

Problem

37 files under node_modules/ are tracked in git despite .gitignore listing node_modules (lines 4-5). They are pnpm symlink artifacts from an old commit that predates (or bypassed) the ignore rule:

• packages/core/node_modules/ — 26 files (.bin/* symlinks, @testing-library/jest-dom)
• packages/docs/node_modules/ — 11 files (.bin/* symlinks)

Any pnpm install re-points these symlinks and dirties the working tree, so every install shows phantom modifications that have nothing to do with real changes. This bit the vitest 4 migration work in #33, where 9 of them showed as modified alongside the actual fix.

Fix

git rm -r --cached packages/core/node_modules packages/docs/node_modules
git commit -m "untrack node_modules artifacts"

No working-tree files are deleted (--cached only), and .gitignore already covers them, so they disappear from git entirely.

Verification

After the commit: git ls-files | grep -c node_modules returns 0, and pnpm install && git status --short shows a clean tree.

Effort

Quick win — one command, zero runtime impact.

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Surfaced during #33 (vitest 4 migration).