Preserve accepted messages for paused recipients (#16679)

Keep accepted deferred requests pending while their recipient is paused and deliver through normal gates after resume. Preserve company, task hold, and cleanup checks.

Verification: 247 focused checks, recursive typecheck, the full CI test and build matrix, and Apex 5/5. The local Git fixture initial-branch limitation is documented in the PR.

Co-Authored-By: Paperclip <noreply@paperclip.ing>

server/src/modules/wake-queue/application/use-cases.ts

@@ -152,12 +152,12 @@ async function runReleaseDrain(
   // The `processedWakeIds` guard below makes a break of the invariant
   // fail loudly, instead of holding this transaction open forever.
   const processedWakeIds = new Set<string>();
-  const handoffWakeIds: string[] = [];
+  const preservedWakeIds: string[] = [];
 
   while (true) {
     const candidate = await ports.transaction.findNextDeferredWake({
       companyId: run.companyId, issueId: issue.id,
-      ...(handoffWakeIds.length ? { excludedWakeIds: handoffWakeIds } : {}),
+      ...(preservedWakeIds.length ? { excludedWakeIds: preservedWakeIds } : {}),
     });
     if (!candidate) break;
     if (processedWakeIds.has(candidate.id)) {
@@ -205,7 +205,7 @@ async function runReleaseDrain(
         // The old owner can release before assignment admission adopts these
         // exact IDs. Leave its receipt intact, skip it for this drain, and let
         // a current-assignee wake behind it proceed.
-        handoffWakeIds.push(candidate.id);
+        preservedWakeIds.push(candidate.id);
       } else {
         // The current owner has finished. An obsolete assignment cannot
         // launch another former-owner run or reopen its completed task.
@@ -283,7 +283,7 @@ async function runReleaseDrain(
 
     // A comment-id rewrite cannot change the agent or pause-hold facts already fetched above, so one decision covers both the rewritten and un-rewritten cases.
     const wakeOutcome = decideWakeOutcome({
-      agent: { agentFound: deferredAgent !== null, invokable: deferredAgent?.invokable ?? false },
+      agent: { agentFound: deferredAgent !== null, invokable: deferredAgent?.invokable ?? false, paused: deferredAgent?.paused === true },
       pauseHold: { activePauseHold: pauseHold.activePauseHold, treeHoldInteractionWake: pauseHold.treeHoldInteractionWake },
     });
 
@@ -292,6 +292,11 @@ async function runReleaseDrain(
       continue;
     }
 
+    if (wakeOutcome.kind === "defer_agent_pause") {
+      preservedWakeIds.push(workingCandidate.id);
+      continue;
+    }
+
     if (wakeOutcome.kind === "cancel_pause_hold") {
       await ports.transaction.cancelDeferredWake({
         companyId: run.companyId,