Gate D written; brief for piece 4, the WebUI first screen on the Console design (#1506, #1503)

Co-Authored-By: Claude Fable 5.1 <[email protected]>

docs/plans/CURRENT.md

@@ -50,10 +50,19 @@ Gate C passed 2026-09-12 on 867619dc (logged by Jason at 4f830680):
 answered in its own session with no send attempt, and the row showed the
 answer on the next scan. #1505 is closed.
 
-Next action: Jason runs Gate D for piece 3, the ledger, under #1506:
-`node packages/ledger/src/cli.mjs --since 2026-09-06 --until 2026-09-12`.
-Choose one number to move next week and write that sentence with the number
-into this file. Do not infer acceptance from the implementation or tests.
+Gate D (2026-09-12, Jason's run of the ledger for 2026-09-06 to 2026-09-12):
+**18.9 human messages per closed issue.** That is the number to move next
+week: every message Jason types to a seat is a nudge the rails did not
+absorb. Target for the week of 2026-09-13: under 10, by assignment through
+`mosaic seat task` and the board instead of the terminal, then the
+orchestrator seat. Companion numbers from the same run, for context only:
+8 issues closed, median 2.7 hours open, 1.9 follow-up commits per issue.
+
+Next action: piece 4, the WebUI on Dewey's Console design (MOSAIC-STACK-D-002).
+Brief on the plan page, section "Piece 4: WebUI first screen (Console)".
+Owner: dewey. Darkwing closes #1506 (Gate D written) and #1504 (registration
+shipped, Gate B passed), then holds for piece 5 (orchestrator seat) unless
+Jason calls it. #1503 stays open until Jason rules on "who is waiting on me".
 
 `packages/ledger` is implemented: read-only local refactor subjects, one
 Gitea issue request, repo seats' user messages, two tables and JSON. Ledger