Extract + unit-test the phantom auto-continue injection path

Move the storeMessage → enqueueMessageCheck side effect out of the delivery
callback into scheduleAutoContinueForPhantomFinal so the injection path is
directly unit-tested: an auto-continue outcome for a delivered final injects the
corrective nudge as an ipc_injected_human message and re-enqueues a turn, while
a non-auto-continue outcome or an undelivered final does nothing. Behavior is
identical to the inline version — this only adds test coverage and a no-op
refactor, so no redeploy is required.

Co-Authored-By: Claude Opus 4.7 <noreply@anthropic.com>

src/phantom-notification-guard.ts

@@ -1,3 +1,5 @@
+import type { NewMessage } from './types.js';
+
 // Guard against "phantom notification" dead-end finals.
 //
 // Agents sometimes end a turn with a sentence like "I'll wait for the build to
@@ -109,3 +111,39 @@ export function resolvePhantomFinalOutcome(args: {
 export function _resetPhantomAutoContinueForTests(): void {
   phantomAutoContinueStreak.clear();
 }
+
+/**
+ * Perform the auto-continue side effect after a final was delivered: inject the
+ * corrective nudge as an inbound instruction and re-enqueue a turn so the agent
+ * runs again and finishes the work. No-op unless the outcome was `auto-continue`
+ * AND the final actually delivered. Returns true when it scheduled a re-run.
+ *
+ * Extracted from the delivery callback so the storeMessage → enqueueMessageCheck
+ * path is unit-testable without standing up a full turn.
+ */
+export function scheduleAutoContinueForPhantomFinal(args: {
+  outcomeKind: PhantomFinalOutcome['kind'];
+  delivered: boolean;
+  chatJid: string;
+  groupFolder: string;
+  runId: string;
+  storeMessage: (message: NewMessage) => void;
+  enqueueMessageCheck: (chatJid: string, groupFolder: string) => void;
+}): boolean {
+  if (args.outcomeKind !== 'auto-continue' || !args.delivered) {
+    return false;
+  }
+  args.storeMessage({
+    id: `phantom-continue-${args.runId}-${Date.now().toString(36)}`,
+    chat_jid: args.chatJid,
+    sender: 'ejclaw-system',
+    sender_name: 'EJClaw',
+    content: PHANTOM_CONTINUE_NUDGE,
+    timestamp: new Date().toISOString(),
+    is_from_me: false,
+    is_bot_message: false,
+    message_source_kind: 'ipc_injected_human',
+  });
+  args.enqueueMessageCheck(args.chatJid, args.groupFolder);
+  return true;
+}