[create-cloudflare] Enable nodejs_compat by default for new projects

[petebacondarwin]

Refs #8310

This PR implements @penalosa's suggestion from PR #8310 to automatically add nodejs_compat via C3 rather than manually adding it to each template.

Instead of modifying every template's wrangler.jsonc file, this change adds the nodejs_compat flag automatically in C3's updateWranglerConfig function when creating new projects. This approach:

• Centralizes the logic in one place rather than duplicating across templates
• Handles both JSON/JSONC and TOML config formats
• Preserves any existing compatibility flags
• Skips adding nodejs_compat if it or nodejs_compat_v2 is already present

Devin PR requested by @petebacondarwin

Link to Devin run: https://app.devin.ai/sessions/7a606cdbe6d148a48d02975f027bf808

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• Tests
  • Tests included/updated
  • Automated tests not possible - manual testing has been completed as follows:
  • Additional testing not necessary because:
• Public documentation
  • Cloudflare docs PR(s):
  • Documentation not necessary because: This is a sensible default change that doesn't require user action or documentation updates

Human review checklist:

• Verify the logic in addNodejsCompatFlag and addNodejsCompatFlagToToml correctly handles edge cases
• Confirm this approach aligns with the suggestion in PR Enable nodejs_compat by default for new projects created by C3 #8310

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[changeset-bot]

🦋 Changeset detected

Latest commit: 66c441e

The changes in this PR will be included in the next version bump.

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[claude]

Claude finished @petebacondarwin's task —— View job

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Changeset Review

✅ All changesets look good

The changeset .changeset/nodejs-compat-default.md follows all guidelines:

1. ✅ Version Type: minor is correct - this is a new default behavior that changes what new projects get out of the box
2. ✅ Changelog Quality: Clear description with helpful context about why this matters and how to opt-out
3. ✅ Markdown Headers: No h1/h2/h3 headers used (only code blocks)
4. ✅ Analytics: No analytics changes in this PR
5. ✅ Not Dependabot: This is a feature change, not a dependency update
6. ✅ Experimental Features: Not an experimental feature, this is a sensible default for all new projects

The changeset properly explains the change, provides context on why it's helpful ("many npm packages require Node.js compatibility"), and includes a clear example of how users can opt-out if needed.

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