Add new Copilot model aliases and catalog entries

[zortos293]

This pull request adds support for new copilot model options and their aliases, ensuring they are properly normalized and resolved. The main updates are to the MODEL_OPTIONS_BY_PROVIDER and MODEL_SLUG_ALIASES_BY_PROVIDER mappings, as well as corresponding tests for normalization and resolution.

New model options and aliases:

• Added gpt-5.4-mini, gemini-3.1-pro, and raptor-mini to the copilot provider in MODEL_OPTIONS_BY_PROVIDER, expanding available model choices. [1] [2] [3]
• Introduced new aliases (5.4-mini, gemini-3.1, raptor) for these models in MODEL_SLUG_ALIASES_BY_PROVIDER to improve user input flexibility. [1] [2]

Testing enhancements:

• Added tests to verify that copilot aliases are correctly mapped to their canonical slugs and that all copilot model options resolve as expected. [1] [2]

Summary by CodeRabbit

• New Features
  • Added three new AI model options: GPT-5.4 mini, Gemini 3.1 Pro, and Raptor mini.
  • Introduced convenient shorthand aliases (5.4-mini, gemini-3.1, raptor) for streamlined model selection.

[coderabbitai]

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📥 Commits

Reviewing files that changed from the base of the PR and between cbd6ea4 and 12315f6.

📒 Files selected for processing (2)

• packages/contracts/src/model.ts
• packages/shared/src/model.test.ts

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📝 Walkthrough

Walkthrough

This pull request adds three new COPILOT model options to the model registry: gpt-5.4-mini, gemini-3.1-pro, and raptor-mini. Each model is accompanied by a slug alias in MODEL_SLUG_ALIASES_BY_PROVIDER to enable shorthand references (5.4-mini, gemini-3.1, and raptor respectively). Test coverage is added for slug normalization and resolution to verify the new aliases map correctly to their canonical slugs and that all model options are properly resolvable by provider.

📝 Coding Plan

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