fix(ci): fix npm auth in generator-cli publish workflow and bump to 0.4.3

[devin-ai-integration]

Description

Refs https://github.com/fern-api/fern/actions/runs/19142492030/job/54711664883

Fixes the failing publish-generator-cli GitHub Actions workflow that was encountering npm authentication errors (ENEEDAUTH). The workflow was attempting to manually write to ~/.npmrc, but npm was not reading from that location during publish.

Changes Made

• Added explicit setup-node step with registry-url configuration before the publish step
• Changed authentication to use NODE_AUTH_TOKEN environment variable (the standard approach for actions/setup-node)
• Removed manual .npmrc file creation that was being ignored
• Bumped generator-cli version to 0.4.3 with appropriate changelog entry

Testing

• Lint checks passed locally (pnpm run check)
• Workflow changes can only be validated when CI runs (will trigger on merge since versions.yml changed)

Review Notes

Important: Merging this PR will trigger the publish workflow since packages/generator-cli/versions.yml was modified. The workflow should now successfully authenticate and publish version 0.4.3 to npm.

The fix follows GitHub Actions best practices for npm publishing as documented in the actions/setup-node README.

---

Link to Devin run: https://app.devin.ai/sessions/a9c49e7f77e24508950c52c5e45d0b8a
Requested by: judah@buildwithfern.com (@jsklan)

[devin-ai-integration]

🤖 Devin AI Engineer

I'll be helping with this pull request! Here's what you should know:

✅ I will automatically:

• Address comments on this PR. Add '(aside)' to your comment to have me ignore it.
• Look at CI failures and help fix them

Note: I can only respond to comments from users who have write access to this repository.

⚙️ Control Options:

• Disable automatic comment and CI monitoring