feat: MCP server mode + TUI cockpit framework
MCP server (bin/fxt/src/mcp/):
- JSON-RPC 2.0 protocol over stdin/stdout
- 32 tool definitions across 11 domains
- McpServer with initialize/tools_list/tools_call handlers
- 21 unit tests
TUI cockpits (bin/fxt/src/tui/):
- Purple/cyan/dark navy theme from design spec
- 6 cockpit views: overview, training, trading, services, risk, data
- Crossterm event loop with key handling (1-6 switch, q quit, ? help)
- CockpitView trait for pluggable cockpit rendering
All 75 tests pass, 0 clippy warnings.
Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>
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