add-provider

Copy the shape of an existing provider (src/models/ollama.ts, src/models/openai.ts, src/models/anthropic.ts). Do not invent a new shape.

1. src/models/<name>.ts

• Match the existing provider interface (availability probe, chat/complete, token count, streaming).
• Availability probe ≤ 1.5 seconds. Long timeouts break REPL cold-start budget.
• HTTP via undici (already a dependency). No axios, no node-fetch.
• Redact credentials via src/security/redact.ts before any log call.
• Map transport errors to ForgeRuntimeError with the right retryable flag and a recoveryHint where possible.

2. src/models/registry.ts

• Add the id to providerEnum.
• Register the class in initProviders.
• If local (runs on the user's machine), add it to isLocalProvider.

3. src/models/local-catalog.ts

• Add model id → family classification here. Do not write ad-hoc regex in the provider for capability detection.

4. src/models/router.ts

• Verify routing reaches the new provider via standard rules. If routing changes, update test/unit/adapter.test.ts.

5. Unit test

Mock the transport (see test/unit/adapter.test.ts). Cover:

• availability probe success and failure,
• chat/complete happy path,
• 429 retry behaviour,
• auth failure surfaces a non-retryable structured error.

6. Docs

Update the provider table in docs/ARCHITECTURE.md §6, bump the README "At a glance" count, and add a one-line setup note to docs/SETUP.md.

Finish with the verify skill.