MK3 TUI - Ratatui Terminal UI

MK3 replaces the old neo-blessed TUI with a modern Rust + Ratatui implementation.

Status

MK1 is frozen. MK3 replaces TUI.

Building

cd apps/mk3-tui
cargo build --release

Running

# With WebSocket (if WS_URL env var is set)
WS_URL=ws://localhost:8081/tui ./target/release/mk3-tui

# With stdin/stdout JSON protocol (default)
./target/release/mk3-tui

Protocol

Input (stdin or WebSocket)

MK3 reads JSON messages:

{"type":"log","message":"System started","ts":"2025-01-13T12:00:00Z"}
{"type":"posture","status":"Healthy"}
{"type":"metrics","cpu":0.23,"mem":0.61}
{"type":"network","status":"Connected"}
{"type":"capabilities","items":["tool1","tool2"]}

Output (stdout or WebSocket)

MK3 sends commands:

{"type":"command","text":"help"}

Layout

• Left column: POSTURE, RESOURCES, ASSETS (stacked)
• Center: OPERATIONS (log viewer)
• Right column: NETWORK, CAPABILITIES (stacked)
• Bottom: COMMAND BAR

Safe bounds: Never draws on last row/column (w-1, h-1).