Board: t21 to Review with its report; new tasks t29, t33-t36; board updates

- t21 report and subtasks ticked.
- New Todo tasks: t33 telling solid ground from loose grains, t34 nozzle blow reach, t35
  diagonal screw tubes, t36 diagonal wall blocks with a sloped face; t29 added on the board.
- The owner's board edits since the last board commit.

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

tasks/t30_progress_meters_while.md

@@ -8,9 +8,10 @@ report: |
   Huge world generates, and worlds come out exactly as before. A small "Saving…" chip appears at
   the bottom right only if a save takes longer than about a sixth of a second. Please try a Huge
   world, Continue, a new claim and travel, and say whether the saving chip should stay.
-status: Review
+status: Done
 created: 2026-10-24
-updated: 2026-10-24T22:54:06Z
+updated: 2026-10-24T23:25:51Z
+order: 18
 ---
 
 ## Context