refactor: kebab-tui crate + tui 서브커맨드 제거 (UI=CLI/MCP)

crates/kebab-cli/Cargo.toml

@@ -23,10 +23,6 @@ kebab-app = { path = "../kebab-app" }
 # kb-cli → kb-eval directly; documented in
 # `tasks/p5/p5-2-metrics-compare.md`.
 kebab-eval = { path = "../kebab-eval" }
-# P9-1: Ratatui shell. UI consumes `kebab-app` only — `kebab-tui`
-# enforces the §8 boundary in its own Cargo.toml; kb-cli just
-# launches it.
-kebab-tui    = { path = "../kebab-tui" }
 # p9-fb-30: MCP stdio server. `Cmd::Mcp` delegates entirely to this crate.
 kebab-mcp    = { path = "../kebab-mcp" }
 anyhow       = { workspace = true }