plans: add DEFERRED.md, the one list of gaps found and not yet handled (#1503)

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

docs/plans/CURRENT.md

@@ -7,6 +7,8 @@ update this file to the next action). No ambiguity, no re-planning.
 
 ## Next action
 
+Gaps found and not fixed go to `docs/plans/DEFERRED.md`, one line each; check it at every gate.
+
 Jason decided on 2026-09-12 (MOSAIC-STACK-D-001) that the MVP is the control
 board: one web page listing running agent sessions across projects, showing each
 one's status, and flagging which ones are waiting on him. Plan page:
@@ -48,7 +50,7 @@ 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: build piece 3, the ledger. Jason approved it on 2026-09-12 and
+Next action: Darkwing is building piece 3, the ledger, under #1506. Jason approved it on 2026-09-12 and
 the brief is on the plan page, section "Piece 3: ledger (numbers for the
 rails)": `packages/ledger`, read-only CLI over the local git log, Gitea
 issues and the repo seats' session logs, with Gate D (Jason writes one