feat(create-gen-app): add CLOSED license option for all rights reserved

[pyramation]

Summary

Adds a new "CLOSED" license option to the create-gen-app package for proprietary/closed-source projects. This provides an "All Rights Reserved" license template alongside the existing open source options (MIT, Apache-2.0, ISC, GPL-3.0, BSD-3-Clause, MPL-2.0, Unlicense).

The license template uses the same placeholder format ({{YEAR}}, {{AUTHOR}}, {{EMAIL_LINE}}) as existing templates and is automatically discovered by the license loading system.

Review & Testing Checklist for Human

• Verify the CLOSED license text is legally appropriate - The license text was written to follow standard "All Rights Reserved" patterns, but you should confirm it meets your legal requirements for proprietary projects
• Run pnpm test in packages/create-gen-app to verify tests pass
• Test the license rendering in a real project scaffold to confirm placeholders are replaced correctly

Notes

Link to Devin run: https://app.devin.ai/sessions/821543f93c294ad78ca4194ac75afc1d
Requested by: Dan Lynch (pyramation@gmail.com) / @pyramation

The license options are defined in the create-gen-app package (part of dev-utils), not in the constructive repo. The user originally asked about inquirerer/create-gen-app/pgpm - it turned out to be in create-gen-app's licenses-templates directory.

[devin-ai-integration]

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