feat: Agent monitoring system with 6 new crates

[aryateja2106]

Summary

• Adds 6 new Rust crates to the flow workspace for autonomous agent orchestration
• Extends flow-core with Feature, Task, Theme (7 themes), Event, and AgentConfig types
• Adds 4 new CLI commands: serve, features, monitor, theme
• 56 tests passing, 0 errors, release binary builds to 7MB

New Crates

Crate	Purpose	Lines
flow-db	SQLite feature management (WAL, SAVEPOINT transactions, event log)	1,752
flow-resolver	Topological sort (Kahn's), cycle detection (DFS), scheduling scores	883
flow-server	axum web server with SSE + WebSocket, file watching, REST APIs	1,282
flow-tui	ratatui TUI with 4 views (Kanban, Agents, Graph, Logs), 3 layouts	944
flow-mcp	MCP server stub for Claude Code integration	stub
flow-orchestrator	Agent process management stub	stub

New CLI Commands

flow serve           # Start web server on port 3456
flow features list   # List all features in SQLite
flow features add    # Create a new feature
flow features ready  # Show features ready to work on
flow features claim  # Claim a feature
flow features graph  # Dependency graph in topological order
flow monitor         # Launch TUI
flow theme list      # Show 7 available themes
flow theme set       # Switch theme (Default, Claude, Twitter, NeoBrutalism, RetroArcade, Aurora, Business)

Test plan

• cargo check - all 11 crates compile
• cargo test - 56 tests pass (22 flow-db + 32 flow-resolver + 2 flow-server)
• cargo clippy - 0 errors (74 pedantic warnings remaining)
• cargo build --release - builds successfully
• flow --help - shows all 10 commands
• flow theme list - displays 7 themes with CSS colors
• flow features --help - shows 7 subcommands
• Verify existing commands (branch, switch, worktree, sync, scan, status) still work

🤖 Generated with Claude Code