Add a New AI Model to Kiln

Integrating a new model into libs/core/kiln_ai/adapters/ml_model_list.py requires:

1. ModelName enum – add an enum member
2. built_in_models list – add a KilnModel(...) entry with providers
3. ModelFamily enum – only if the vendor is brand-new

After code changes, run paid integration tests, then draft a Discord post.

Global Rules

These apply throughout the entire workflow.

• Sandbox: All curl and uv run commands MUST use required_permissions: ["all"]. The sandbox breaks uv run (Rust panics) and blocks network access for curl.
• Slug verification: NEVER guess or infer model slugs from naming patterns. Every model_id must come from an authoritative source (LiteLLM catalog, official docs, API reference, or changelog). If you can't verify a slug, tell the user and ask them to provide it.
• Date awareness: These models are often released very recently. Web search for current info before assuming you know the details.