llm-release-gate v0.1.2

Marketplace metadata fix

• Shortens the Action description to 122 characters, satisfying GitHub Marketplace validation.
• Keeps the Action behavior unchanged; package metadata and the measured regression-demo hash now report 0.1.2 consistently.
• v0 now points to this reviewed patch release.

To list the Action, open this release, select Publish this Action to the GitHub Marketplace, choose Continuous integration as the primary category (optional Code quality), then complete GitHub's agreement and identity prompts.