Move provider × base_url validation patterns from llm_runner.py to
factory.py's ProviderSpec, implementing the architecture improvement
suggested in docs/architecture/orchestrator-validation.md.
Changes:
- Add base_url_patterns field to ProviderSpec dataclass
- Split ollama and openrouter into separate ProviderSpec entries
(previously shared openai's spec with dynamic provider selection)
- Add validate_provider_base_url() function in factory for reusable validation
- Simplify LLMRunner._detect_provider_mismatch() to delegate to factory
- Update architecture doc with change log and implementation notes
Benefits:
- Single source of truth for provider configuration
- Easier maintenance when adding/updating providers
- Reduced code duplication (llm_runner.py: -39 lines, factory.py: +84 lines)
- Factory validation can be tested independently
All 28 orchestrator validation tests pass, including 6 provider mismatch tests.
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