Phase 5 architecture consolidation - #123

Compare main against phase-5-architecture-consolidation to verify Phase 5 only.

Phase 5 goal: eliminate architectural duplication and establish one authoritative model-routing path.

Phase 5 work:

• Made LLMFactory the single provider entry point.
• Retired/reworked duplicate ProviderManager and simulated ModelOrchestrator paths.
• Established the authoritative ModelRouter.
• Added TaskType, TaskComplexity, ModelPolicy, AgentRequest, and AgentResult.
• Added structured routing decisions.
• Unified the flow:
  User Request → Task Classifier → Complexity → Model Policy → ModelRouter → LLMFactory → Provider/Ollama.
• Corrected routing/task-classification precedence.
• Updated stale MCP test mocks to match the new architecture.

Audit only:

• Compare all Phase 5 changes against main.
• Confirm there is one real model-routing path.
• Confirm no legacy duplicate routing remains.
• Identify unrelated changes or remaining issues.
• Do not modify, commit, or merge anything.

End with a clear verdict: PHASE 5 COMPLETE or PHASE 5 NOT COMPLETE.