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.

src/tui/tui-render.ts

@@ -213,8 +213,8 @@ export function glyphsFor(tier: TuiGlyphTier): TuiGlyphSet {
 /**
  * Glyph tier from the environment. IO-ish by nature (it reads env), so it takes
  * the env as an argument and the app layer calls it once at startup. The
- * known-capable list is the same gate `scripts/tmux-chooser.sh` uses, plus a
- * UTF-8 locale check and an explicit override.
+ * known-capable list is a TERM allowlist, plus a UTF-8 locale check and an
+ * explicit override.
  */
 export function detectGlyphTier(env: Record<string, string | undefined>): TuiGlyphTier {
   const override = env.CODEMAN_TUI_GLYPHS;