docs: point terminal users at codeman tui instead of the sc chooser

codeman tui supersedes the sc bash chooser: it reaches sessions 10+,
carries the server's real states instead of a static list, and leaves an
attach with one key. Every place that told a user to run sc now names the
tui equivalent, including the two wiki pages and install.sh's next-steps
banner. Both wiki pages also carried the wrong detach chord (Ctrl+A D;
the socket's prefix is C-b), which the tui makes moot.

Source comments that explained themselves as "the sc -l replacement" now
just say what they do. docs/tui-plan.md and CHANGELOG.md are historical
records and keep their references.

README.md

@@ -285,7 +285,7 @@ Hit start — Codeman spawns the CLI via a real PTY and streams it to your brows
 
 - **Phone/tablet** — the UI is fully touch-optimized; scan the desktop **QR code** to log in without typing a password.
 - **Outside your network** — `./scripts/tunnel.sh start` opens a Cloudflare tunnel (set `CODEMAN_PASSWORD` first).
-- **SSH** — the `sc` chooser attaches to any session from a terminal (`sc` interactive, `sc 2` quick-attach, `sc -l` list).
+- **SSH** — `codeman tui` is a full-screen dashboard in the terminal (`codeman tui --list` to list, `codeman tui 2` to attach straight to one).
 
 ### 7. Operate & maintain
 
@@ -674,20 +674,6 @@ The web UI remains the primary surface; see **[docs/tui.md](docs/tui.md)** for t
 
 ---
 
-## SSH Alternative (`sc`)
-
-If you prefer SSH (Termius, Blink, etc.), the `sc` command is a thumb-friendly session chooser:
-
-```bash
-sc              # Interactive chooser
-sc 2            # Quick attach to session 2
-sc -l           # List sessions
-```
-
-Single-digit selection (1-9), color-coded status, token counts, auto-refresh. `sc` hands you to a plain `tmux attach`, so you leave the pane with tmux's own detach chord: `Ctrl+B`, release, then `d`. (`codeman tui` is the one that gives you a single `F1` instead, because its attach claims that key for the duration.)
-
----
-
 ## Keyboard Shortcuts
 
 > Ctrl bindings also accept Cmd on macOS.