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.

test/cli-commands.test.ts

@@ -138,7 +138,7 @@ describe('registered options', () => {
     expect(flagsOf(find(program, 'doctor')!)).toEqual(expect.arrayContaining(['--json', '--category']));
   });
 
-  it('keeps the two `tui` fast paths, which stand in for `sc -l` and `sc 2`', () => {
+  it('keeps the two `tui` fast paths that scripts call', () => {
     expect(flagsOf(find(program, 'tui')!)).toEqual(expect.arrayContaining(['-l', '--list']));
   });