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New `crates/maestro-tui/` library behind a `tui` cargo feature on the umbrella binary (default-on). Ships a clap-derive `TuiArgs` and a `run()` stub that returns `NotImplemented` — exercises the full dispatch path so phases 2+ can fill in the catalog, session liveness, widgets, and event loop without touching scaffolding. Acceptance: - `cargo build -p maestro --features tui` succeeds - `maestro tui` prints "maestro: not implemented" and exits 1 - `cargo test -p maestro-tui` passes (2 clap-parse tests) - `cargo fmt --check` + `cargo clippy --all-targets --features tui -- -D warnings` clean Phase 1 of the Maestro TUI epic (NAP-275); plan in `docs/superpowers/plans/2026-05-28-maestro-tui.md`.