diff --git a/docs/plans/2026-09-12_control-board-mvp.md b/docs/plans/2026-09-12_control-board-mvp.md
index 59830781..51a35b3b 100644
--- a/docs/plans/2026-09-12_control-board-mvp.md
+++ b/docs/plans/2026-09-12_control-board-mvp.md
@@ -295,6 +295,69 @@ is his say-so at the end of the day, with any exception written as a line in
 - No fleet sources, no comms changes, no `packages/seat` changes.
 - Dewey coordinates with Darkwing before touching any board file.
 
+## Piece 5: darkwing on point (orchestrator behaviour)
+
+Approved in principle by Jason 2026-09-12 evening ("have darkwing on the
+fleet running point"). Starts when Jason sends darkwing the start message,
+planned Sunday 2026-09-13. Owner: darkwing. Purpose: move the Gate D number
+(18.9 human messages per closed issue) by having a seat do the assigning.
+
+### What it is
+
+Mostly behaviour, with one small code change.
+
+**Code (one commit, with tests):** `mosaic seat task` records who set the
+task: a `taskSetBy` field from `MOSAIC_AGENT_NAME`, or `--by NAME`, or
+"unknown"; the scanner serializes it and the page shows it next to the task
+source. Closes the "set by" line in `DEFERRED.md`.
+
+**Behaviour, darkwing's loop for every item it runs:**
+
+1. Read `docs/plans/CURRENT.md` and `docs/plans/DEFERRED.md`. Take the next
+   queue item Jason has called, or one bounded Open line from DEFERRED that
+   touches no file another seat is on. Never take two.
+2. Open the Gitea issue with the acceptance sentence and the owning seat.
+3. Set the owning seat's task with `scripts/mosaic seat task <seat> "<issue
+   and one-line ask>"`.
+4. Send the start message to the seat through `tools/tmux/agent-send.sh`
+   aimed at the tmux session in the seat's registration (ms-communications
+   rules apply; a refusal is a finding, not something to route around).
+5. Receive the seat's report the same way. Verify: tests run, review by a
+   seat that did not write the code, acceptance sentence met.
+6. Close the issue, move the DEFERRED line to Done with the commit, update
+   `CURRENT.md`.
+7. Report to Jason only at a gate or a block, in darkwing's own session
+   (the board reads it). No progress narration.
+
+**What darkwing does not do:** brief new pieces (Jason and the coordinator
+do), start a queue item Jason has not called, push anywhere but `refactor`,
+touch `~/.mosaic`, or message Jason for routine decisions the plan already
+settles (AGENTS.md "Decide and continue").
+
+### First assignment under this piece
+
+Filbert: the DEFERRED line "Relaunched seat shows the old last message":
+when a registration's `startedAt` is newer than the session's last activity,
+the row shows "relaunched at X, no messages since" instead of the stale
+activity. Board test with a fixture registration newer than the log.
+Darkwing runs steps 1 to 7 for it without Jason's involvement.
+
+### Gate F (yes/no)
+
+Filbert's item goes from a DEFERRED line to a closed issue with Jason having
+sent filbert nothing. Evidence: the ledger for 2026-09-13 shows filbert's
+Human column at 0 and the issue closed; Jason's only start message that day
+is the one to darkwing.
+
+### Boundaries
+
+- No new package, no scheduler, no daemon; darkwing runs the loop while its
+  session is live and stops when it is not.
+- No fleet seats, no changes to `tools/tmux/agent-send.sh` or the comms
+  skill; a refusal from either is reported as a finding.
+- `packages/seat` and `packages/control-board` change only for the
+  `taskSetBy` field.
+
 ## How the scanner decides state
 
 The scanner reads the newest pi session log for each agent, plus whether
diff --git a/docs/plans/CURRENT.md b/docs/plans/CURRENT.md
index 7ac2ac70..e76938ed 100644
--- a/docs/plans/CURRENT.md
+++ b/docs/plans/CURRENT.md
@@ -60,7 +60,14 @@ orchestrator seat. Companion numbers from the same run, for context only:
 
 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 closed #1506 (Gate D written, comment 26067) and
+Owner: dewey, issue #1507 opened HTTP 201 on 2026-09-13 UTC. Implementation
+in `packages/webui`; Darkwing confirmed no source overlap and released tracking
+at fab40f25. Filbert is the independent reviewer. Board files stay unchanged;
+any needed board edit requires exact ownership coordination first. Next: verify
+Console against board fixtures and browser checks, then pin for review and
+publish to refactor under Jason's explicit commit/push authority. Gate E remains
+Jason's Monday acceptance; tests do not close that gate.
+Darkwing closed #1506 (Gate D written, comment 26067) and
 #1504 (registration shipped, Gate B passed, comment 26069) on 2026-09-13 UTC.
 Darkwing holds for piece 5 (orchestrator seat) until Jason calls it. #1503 stays open until Jason rules on "who is waiting on me".
 
diff --git a/docs/plans/DEFERRED.md b/docs/plans/DEFERRED.md
index e0072241..90d172e1 100644
--- a/docs/plans/DEFERRED.md
+++ b/docs/plans/DEFERRED.md
@@ -57,8 +57,9 @@ at every gate. Started 2026-09-12 during the control board MVP.
 
 1. WebUI on Dewey's Console design absorbs the board as its first screen
    (piece 4, MOSAIC-STACK-D-002, Gate E on Monday 2026-09-14).
-3. Orchestrator seat: assigns tasks through `mosaic seat task`, closes the
-   "set by" gap.
+3. Darkwing on point (piece 5, briefed on the plan page; starts Sunday
+   2026-09-13 on Jason's message; Gate F: filbert's item closes with zero
+   human messages to filbert). Closes the "set by" gap.
 4. Fleet launch through `mosaic launch`: the stress test.
 
 ## Done