fix: drop the two keymap and style entries nothing reaches

`mark()` had no callers (knip's only finding on this branch), and the
renderer's fallback help list advertised `r` resume, which is deferred
with the rest of phase 3: a help screen naming a verb the build does not
implement is worse than no help.

Co-Authored-By: Claude Fable 5 <noreply@anthropic.com>

src/cli-style.ts

@@ -77,11 +77,6 @@ export function tint(tone: Tone, text: string): string {
   return TONE_STYLE[tone](text);
 }
 
-/** Colored glyph for a tone, the `✓ ` / `✗ ` prefix most command output opens with. */
-export function mark(tone: Tone): string {
-  return tint(tone, glyphFor(tone));
-}
-
 // ─────────────────────────────────────────────────────────────────────────────
 // Blocks
 // ─────────────────────────────────────────────────────────────────────────────