ci: install node-gyp before pnpm install

[coderdan]

Summary

• Adds an npm install -g node-gyp step before pnpm install in tests.yml (both jobs) and release.yml.
• Unblocks the pnpm/action-setup v4 → v6 bump in chore(actions): bump pnpm/action-setup from 4 to 6.0.3 #390, which currently fails because v6 no longer ships node-gyp on PATH and node-pty@1.1.0 falls back to node-gyp rebuild (no linux-x64 prebuild matches).

Why

The failing log on #390 shows:
```
node-pty install: > Rebuilding because directory .../prebuilds/linux-x64 does not exist
node-pty install: sh: 1: node-gyp: not found
ELIFECYCLE Command failed.
```
Main is currently still on pnpm/action-setup@v4 (which bundles node-gyp), so this change is a no-op on main today and only takes effect once #390 lands. Including the same step in release.yml so the release path doesn't break the moment #390 merges.

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⚙️ Run configuration

Configuration used: defaults

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Run ID: bb446e9a-53a2-4963-935e-722297500338

📥 Commits

Reviewing files that changed from the base of the PR and between 6f67582 and 74370cd.

📒 Files selected for processing (2)

• .github/workflows/release.yml
• .github/workflows/tests.yml

✨ Finishing Touches

🧪 Generate unit tests (beta)

• Create PR with unit tests
• Commit unit tests in branch dan/fix-node-gyp-pnpm-action-v6

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[changeset-bot]

⚠️ No Changeset found

Latest commit: 74370cd

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.

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[auxesis]

Nice fix, thanks @coderdan.