Drive open-task occupancy when the fleet dry edge is missed

CHANGELOG.md

@@ -21,6 +21,8 @@ parallel copies under `docs/` or `scripts/notes/`. At cut time: rename
 
 ### Fixed
 
+- Occupancy takes one dry-episode shot when the parent settles idle even if the
+  live fleet 1→0 edge was never observed.
 - Dry-fleet transcript and `/status` report the outcome tally only
   (`2 done, 1 failed`). They no longer claim `nothing running` when the
   parent may still continue.

src/tui/runtime-bridge.test.ts

@@ -1718,6 +1718,193 @@ describe("fleet-dry open-task drive (CL-7540)", () => {
     );
   });
 
+  test("already-dry settle drives once even without a live 1→0 fleet event", async () => {
+    await withTestRenderer(
+      async (h) => {
+        const shell = createAppShell(h.renderer, {
+          terminal: { columns: 80, rows: 24 },
+          wireKeys: false,
+          run: "idle",
+        });
+        const port = createRecordingPort();
+        const bridge = attachSessionBridge(shell, port);
+        try {
+          const prompt =
+            "The fleet has gone dry. Remaining open tasks:\n- t1: keep going (todo)\n";
+          let drives = 0;
+          bridge.setDryOpenTaskDriver(() => {
+            drives += 1;
+            bridge.beginSystemContinuation(prompt);
+            return true;
+          });
+          bridge.submit("dispatch workers", "immediate");
+          bridge.handle({ type: "fleet", running: 0 });
+          expect(drives).toBe(0);
+          expect(shell.session.run).toBe("busy");
+          settleToollessTurn(bridge);
+          expect(drives).toBe(1);
+          expect(shell.session.run).toBe("busy");
+          settleToollessTurn(bridge);
+          expect(drives).toBe(1);
+        } finally {
+          bridge.dispose();
+          shell.dispose();
+        }
+      },
+      { width: 80, height: 24 },
+    );
+  });
+
+  test("a no-op dry settle does not eat the shot for a later missed 1→0 with open tasks", async () => {
+    await withTestRenderer(
+      async (h) => {
+        const shell = createAppShell(h.renderer, {
+          terminal: { columns: 80, rows: 24 },
+          wireKeys: false,
+          run: "idle",
+        });
+        const port = createRecordingPort();
+        const bridge = attachSessionBridge(shell, port);
+        try {
+          const prompt =
+            "The fleet has gone dry. Remaining open tasks:\n- t1: keep going (todo)\n";
+          let openTasks = false;
+          let drives = 0;
+          bridge.setDryOpenTaskDriver(() => {
+            if (!openTasks) return false;
+            drives += 1;
+            bridge.beginSystemContinuation(prompt);
+            return true;
+          });
+          bridge.submit("first turn, no todos", "immediate");
+          bridge.handle({ type: "fleet", running: 0 });
+          settleToollessTurn(bridge);
+          expect(drives).toBe(0);
+          expect(shell.session.run).toBe("idle");
+
+          openTasks = true;
+          bridge.submit("dispatch workers", "immediate");
+          bridge.handle({ type: "fleet", running: 0 });
+          expect(drives).toBe(0);
+          expect(shell.session.run).toBe("busy");
+          settleToollessTurn(bridge);
+          expect(drives).toBe(1);
+          expect(shell.session.run).toBe("busy");
+          settleToollessTurn(bridge);
+          expect(drives).toBe(1);
+        } finally {
+          bridge.dispose();
+          shell.dispose();
+        }
+      },
+      { width: 80, height: 24 },
+    );
+  });
+
+  test("a new live lane resets the dry-episode latch for one more occupancy shot", async () => {
+    await withTestRenderer(
+      async (h) => {
+        const shell = createAppShell(h.renderer, {
+          terminal: { columns: 80, rows: 24 },
+          wireKeys: false,
+          run: "idle",
+        });
+        const port = createRecordingPort();
+        const bridge = attachSessionBridge(shell, port);
+        try {
+          const prompt =
+            "The fleet has gone dry. Remaining open tasks:\n- t1: keep going (todo)\n";
+          let drives = 0;
+          bridge.setDryOpenTaskDriver(() => {
+            drives += 1;
+            bridge.beginSystemContinuation(prompt);
+            return true;
+          });
+          bridge.submit("dispatch workers", "immediate");
+          settleToollessTurn(bridge);
+          expect(drives).toBe(1);
+          expect(shell.session.run).toBe("busy");
+          settleToollessTurn(bridge);
+          expect(drives).toBe(1);
+          expect(shell.session.run).toBe("idle");
+
+          bridge.submit("dispatch more workers", "immediate");
+          bridge.handle({ type: "fleet", running: 1 });
+          settleToollessTurn(bridge);
+          expect(drives).toBe(1);
+          expect(shell.session.run).toBe("busy");
+          bridge.handle({ type: "fleet", running: 0 });
+          expect(drives).toBe(2);
+          expect(shell.session.run).toBe("busy");
+        } finally {
+          bridge.dispose();
+          shell.dispose();
+        }
+      },
+      { width: 80, height: 24 },
+    );
+  });
+
+  test("parent still processing does not take the occupancy shot", async () => {
+    await withTestRenderer(
+      async (h) => {
+        const shell = createAppShell(h.renderer, {
+          terminal: { columns: 80, rows: 24 },
+          wireKeys: false,
+          run: "idle",
+        });
+        const port = createRecordingPort();
+        const bridge = attachSessionBridge(shell, port);
+        try {
+          let drives = 0;
+          bridge.setDryOpenTaskDriver(() => {
+            drives += 1;
+            return true;
+          });
+          bridge.submit("dispatch workers", "immediate");
+          bridge.handle({ type: "fleet", running: 0 });
+          expect(drives).toBe(0);
+          expect(shell.session.run).toBe("busy");
+          expect(bridge.turn.isProcessing).toBe(true);
+        } finally {
+          bridge.dispose();
+          shell.dispose();
+        }
+      },
+      { width: 80, height: 24 },
+    );
+  });
+
+  test("live fleet still blocks the occupancy drive", async () => {
+    await withTestRenderer(
+      async (h) => {
+        const shell = createAppShell(h.renderer, {
+          terminal: { columns: 80, rows: 24 },
+          wireKeys: false,
+          run: "idle",
+        });
+        const port = createRecordingPort();
+        const bridge = attachSessionBridge(shell, port);
+        try {
+          let drives = 0;
+          bridge.setDryOpenTaskDriver(() => {
+            drives += 1;
+            return true;
+          });
+          bridge.submit("dispatch workers", "immediate");
+          bridge.handle({ type: "fleet", running: 1 });
+          settleToollessTurn(bridge);
+          expect(drives).toBe(0);
+          expect(shell.session.run).toBe("busy");
+        } finally {
+          bridge.dispose();
+          shell.dispose();
+        }
+      },
+      { width: 80, height: 24 },
+    );
+  });
+
   test("occupancy send failure re-arms, clears continuation hold, and drains follow-ups", async () => {
     await withTestRenderer(
       async (h) => {

src/tui/runtime-bridge.ts

@@ -252,15 +252,15 @@ export interface SessionBridge {
   beginSystemContinuation: (text: string) => void;
   /**
    * Occupancy send failed after beginSystemContinuation. Drop the occupancy
-   * echo so a later matching inbound is not swallowed, re-arm the dry-open
+   * echo so a later matching inbound is not swallowed, re-arm the dry-episode
    * latch, drop the continuation hold, and idle so follow-ups can drain and a
    * later settle can take another occupancy shot.
    */
   abortSystemContinuation: () => void;
   /**
-   * Occupancy owner for dry+open continuation. Called once from
-   * settleRunToIdle when a latched fleet-dry edge is still dry. Return true
-   * if a continuation was sent (run stays busy).
+   * Occupancy owner for dry+open continuation. Called once per dry episode
+   * from settleRunToIdle when the fleet is dry. Return true if a continuation
+   * was sent (run stays busy).
    */
   setDryOpenTaskDriver: (driver: (() => boolean) | undefined) => void;
 }
@@ -425,18 +425,19 @@ export interface BridgeBag {
    */
   flushPendingAskWake: (() => void) | null;
   /**
-   * One deferred occupancy shot for the last live-fleet → 0 edge. Consumed on
-   * settle so a missed wentDry while the parent was processing still drives
-   * once, and a later settle cannot loop.
+   * One occupancy shot per dry episode. Reset when a live lane starts. Consumed
+   * only when the driver actually sends a continuation — a no-op (no open
+   * tasks) must not eat the shot, or a later missed 1→0 with leftover tasks
+   * never drives. A later settle after a true drive cannot loop.
    */
-  pendingDryOpenDrive: boolean;
+  droveOpenTasksThisDry: boolean;
   /**
    * beginSystemContinuation re-armed the turn during the previous cycle's
    * settle. Late connector.reply from that cycle must not settle this one
    * until its own inference.start arrives.
    */
   awaitingContinuationInference: boolean;
-  /** Occupancy driver: collect+send when settle takes the deferred dry shot. */
+  /** Occupancy driver: collect+send when settle takes a dry-episode shot. */
   dryOpenTaskDriver: (() => boolean) | undefined;
   /** Last prompt actually sent — replay source for the quota auto-retry. */
   lastSentMessage: string;
@@ -1011,19 +1012,17 @@ function drainLiveSteersAtBoundary(shell: AppShell, bag: BridgeBag): void {
   }
 }
 
-function occupancyHold(bag: BridgeBag, runBusy: boolean): boolean {
-  if (bag.liveFleet > 0 || bag.awaitingContinuationInference) return true;
-  return runBusy && bag.pendingDryOpenDrive;
+function occupancyHold(bag: BridgeBag): boolean {
+  return bag.liveFleet > 0 || bag.awaitingContinuationInference;
 }
 
 /**
  * Release the run to idle and drain everything queued — but only at true
  * session-idle. A live fleet holds the run busy after the parent turn settles
  * (idle-with-fleet): Enter upgrades to a new primary turn during the hold and
  * follow-ups keep waiting; the fleet event landing at zero re-enters here to
- * release the hold. A latched dry edge with open tasks takes one occupancy
- * shot here instead of idling, so a wentDry missed while processing cannot
- * disagree with settle.
+ * release the hold. A dry fleet takes one occupancy shot here per dry episode
+ * instead of idling, even if the live 1→0 edge was never observed.
  */
 function settleRunToIdle(shell: AppShell, bag: BridgeBag): void {
   if (shell.session.run !== "busy") return;
@@ -1041,15 +1040,19 @@ function settleRunToIdle(shell: AppShell, bag: BridgeBag): void {
     bag.flushPendingAskWake?.();
     return;
   }
-  if (bag.pendingDryOpenDrive) {
-    bag.pendingDryOpenDrive = false;
+  if (!bag.droveOpenTasksThisDry) {
     let driven = false;
     try {
       driven = bag.dryOpenTaskDriver?.() === true;
     } catch {
       driven = false;
     }
-    if (driven) return;
+    // Consume only on a real continuation. A false/no-op leaves the latch
+    // open so a later missed-edge settle with open tasks can still fire.
+    if (driven) {
+      bag.droveOpenTasksThisDry = true;
+      return;
+    }
   }
   shell.session = setRunState(shell.session, "idle");
   bag.awaitingContinuationInference = false;
@@ -1074,12 +1077,9 @@ function applyInbound(
     // queued follow-ups drain now. While the parent is still working the
     // count just updates — the ordinary turn settle does the draining.
     if (event.type === "fleet") {
-      const previous = bag.liveFleet;
       bag.liveFleet = event.running;
       if (event.running > 0) {
-        bag.pendingDryOpenDrive = false;
-      } else if (previous > 0) {
-        bag.pendingDryOpenDrive = true;
+        bag.droveOpenTasksThisDry = false;
       }
       if (event.running === 0 && !bag.turn.isProcessing) {
         settleRunToIdle(shell, bag);
@@ -1185,7 +1185,7 @@ export function attachSessionBridge(
     pendingAskWake: new Map(),
     deliveredAskWake: new Map(),
     flushPendingAskWake: null,
-    pendingDryOpenDrive: false,
+    droveOpenTasksThisDry: false,
     awaitingContinuationInference: false,
     dryOpenTaskDriver: undefined,
     lastSentMessage: "",
@@ -1292,7 +1292,7 @@ export function attachSessionBridge(
       currentToolName: turn.currentToolName,
       streamingType: turn.streamingType,
       nowMs,
-      sessionActive: occupancyHold(bag, shell.session.run === "busy"),
+      sessionActive: occupancyHold(bag),
     };
     const fleet = fleetProgress(bag.agentSessions, nowMs);
     const label = resolveTurnLabel(input, isStalled, fleet);
@@ -1573,7 +1573,7 @@ export function attachSessionBridge(
     bag.liveFleet = 0;
     bag.pendingAskWake.clear();
     bag.deliveredAskWake.clear();
-    bag.pendingDryOpenDrive = false;
+    bag.droveOpenTasksThisDry = false;
     bag.awaitingContinuationInference = false;
     bag.pendingRowUpdates.clear();
     paintChrome(shell);
@@ -1746,7 +1746,7 @@ export function attachSessionBridge(
         }
       }
       bag.awaitingContinuationInference = false;
-      bag.pendingDryOpenDrive = true;
+      bag.droveOpenTasksThisDry = false;
       bag.lastSentMessage = "";
       flushOpenRow(shell, bag);
       bag.turnThinking = null;