Add shared ProviderManager architecture for runtime provider/model switching
between TUI and Engine:
Core Architecture:
- Add SwitchProvider and SwitchModel messages to UserAction enum
- Create run_engine_loop_dynamic() with shared ProviderManager
- Add ClientSource enum to AgentManager (Fixed vs Dynamic)
- Implement get_client() that resolves provider at call time
TUI Integration:
- Add ProviderMode::Shared variant for shared manager
- Add with_shared_provider_manager() constructor
- Update switch_provider/set_current_model for shared mode
- Fix /model command to update shared ProviderManager (was only
updating local TUI state, not propagating to engine)
- Fix /provider command to use switch_provider()
Infrastructure:
- Wire main.rs to create shared ProviderManager for both TUI and engine
- Add HTTP status code validation to Ollama client
- Consolidate messages.rs and state.rs into agent-core
Both TUI and Engine now share the same ProviderManager via
Arc<Mutex<>>. Provider/model changes via [1]/[2]/[3] keys, model
picker, or /model command now properly propagate to the engine.
🤖 Generated with [Claude Code](https://claude.com/claude-code)
Co-Authored-By: Claude <noreply@anthropic.com>
vikingowl
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