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Chat is LLM-essential but not model-specific — instead of failing when the
pinned model is down/drifted, it now fails over across an ordered chain and
reports which model actually answered.
- Ordered fallback: an Llm declares `extraConfig.fallbacks: string[]`; the
dispatcher builds primary-pool → fallback-pool(s) candidates and tries them
in order (resolveCandidatesWithFallbacks).
- Fail over on real failures, not just transport: runOneInference now advances
on a non-2xx status (e.g. a 400 from a drifted model) or an empty/invalid
completion, not only thrown transport errors. Streaming fails over
pre-first-chunk (already threw on 4xx).
- Transparency: ChatResult + the SSE `final` frame carry {llm, model,
failedOver}; the CLI prints `model: <llm> (<model>)` each turn and
`⚠ failed over → answered by …` when a fallback was used.
- Exhaustion names the last model + upstream body (not "no choice").
Tests: 3 failover unit tests (primary 400 → fallback answers + model reported;
primary answers → failedOver=false; all fail → clear aggregated error).
mcpd 948 + CLI 508 green; tsc + lint clean. docs/reliability.md updated.
Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>