Docs: Apply to All reaches the slide masters (#891); keep gaps.md a list of shortfalls

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>

ROADMAP.md

@@ -134,6 +134,7 @@ app's JSON control channel (`deckcraft --control PORT`).
 
 | Date | What landed |
 |---|---|
+| 2026-10-23 | Format Background ▸ Apply to All also sets the background of the slide masters the slides use (and clears their layouts' overrides), so new slides keep it (#891) |
 | 2026-10-22 | Table text takes the master's other-text style (`otherStyle`), shapes and text boxes the presentation's default text style, as PowerPoint for Mac draws them (synthetic probe: 14 pt cells under a 14 pt `otherStyle` and a 26 pt `defaultTextStyle`); a private deck's table had been drawn 20 pt instead of 18 |
 | 2026-10-18 | Find (Ctrl+F): "Find what:" has the keyboard as soon as the dialog opens, and keeps it after Enter finds a match, so the search can be typed and changed without clicking the field (#951) |
 | 2026-10-18 | Duplicate (Ctrl+D) repeats a move: duplicate a shape, move the copy, and the next Duplicate places its copy the same distance further on, as in PowerPoint (#966) |

docs/gaps.md

@@ -14,8 +14,6 @@ tests (calibration in [target-app-parity.md](target-app-parity.md#calibration-ho
 When a gap closes, delete its entry, update the parity doc it points to, and add a line to the
 revision history.
 
-Chart number-format reliability: explicit empty sections now hide the corresponding numeric labels, including all values with three semicolons. Blank whole-code General fallback remains. Synthetic formatter regressions cover section selection and quoted/escaped semicolons; broader chart-element gaps and readiness estimates below are unchanged.
-
 ## Ranked: the top 15
 
 | # | Gap | Category | Beta | Hours | Doc |