feat(phase10): complete MCP-only architecture migration

Phase 10 "Cleanup & Production Polish" is now complete. All LLM
interactions now go through the Model Context Protocol (MCP), removing
direct provider dependencies from CLI/TUI.

## Major Changes

### MCP Architecture
- All providers (local and cloud Ollama) now use RemoteMcpClient
- Removed owlen-ollama dependency from owlen-tui
- MCP LLM server accepts OLLAMA_URL environment variable for cloud providers
- Proper notification handling for streaming responses
- Fixed response deserialization (McpToolResponse unwrapping)

### Code Cleanup
- Removed direct OllamaProvider instantiation from TUI
- Updated collect_models_from_all_providers() to use MCP for all providers
- Updated switch_provider() to use MCP with environment configuration
- Removed unused general config variable

### Documentation
- Added comprehensive MCP Architecture section to docs/architecture.md
- Documented MCP communication flow and cloud provider support
- Updated crate breakdown to reflect MCP servers

### Security & Performance
- Path traversal protection verified for all resource operations
- Process isolation via separate MCP server processes
- Tool permissions controlled via consent manager
- Clean release build of entire workspace verified

## Benefits of MCP Architecture

1. **Separation of Concerns**: TUI/CLI never directly instantiates providers
2. **Process Isolation**: LLM interactions run in separate processes
3. **Extensibility**: New providers can be added as MCP servers
4. **Multi-Transport**: Supports STDIO, HTTP, and WebSocket
5. **Tool Integration**: MCP servers expose tools to LLMs

This completes Phase 10 and establishes a clean, production-ready architecture
for future development.

🤖 Generated with [Claude Code](https://claude.com/claude-code)

Co-Authored-By: Claude <noreply@anthropic.com>

crates/owlen-tui/Cargo.toml

@@ -10,8 +10,7 @@ description = "Terminal User Interface for OWLEN LLM client"
 
 [dependencies]
 owlen-core = { path = "../owlen-core" }
-owlen-ollama = { path = "../owlen-ollama" }
-# Removed circular dependency on `owlen-cli`. The TUI no longer directly depends on the CLI crate.
+# Removed owlen-ollama dependency - all providers now accessed via MCP architecture (Phase 10)
 
 # TUI framework
 ratatui = { workspace = true }