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When the primary model fails (finish_reason="error" after exhausting provider-level retries), automatically try each model in the configured fallback_models list. Supports cross-provider fallback via a cached provider_factory that resolves the correct provider for each model string. Config: agents.defaults.fallback_models: ["model-b", "provider/model-c"] Changes: - AgentDefaults: add fallback_models field - AgentRunSpec: add fallback_models field - AgentRunner: add provider_factory, _call_provider, _resolve_fallback_provider - AgentLoop: accept and forward fallback_models + provider_factory - nanobot.py: extract _make_provider_for_model, add _make_provider_factory - cli/commands.py: add _make_cli_provider_factory, wire all AgentLoop sites - tests/agent/test_runner_fallback.py: 8 test cases covering primary success, single/multi fallback, cross-provider, no-factory reuse, caching Made-with: Cursor