feat(case-ui): agents tab v2 + dismiss/reaper for stale interactions (#215)

מוקאפ 18i v2 (מאושר ב-Claude Design) + תיקון-מקור להצטברות pending interactions.

UI (agent-activity-feed.tsx):
- רוסטר-סוכנים קומפקטי, כל הסוכנים בשורה אחת (grid-cols-9); הוסרה שורת
  "מה הסוכן עושה עכשיו" — היא שייכה תגובה לפי role-fallback, כך שסוכנים
  בעלי אותו תפקיד הציגו טקסט זהה.
- כל אירוע "ממתין לתשובתך" מקופל כאקורדיון (הראשון פתוח).
- כפתור "התעלם" לכל בקשה ממתינה — מבטל שאלה כפולה/מיושנת בלי להעיר את הסוכן.
- ציר-הזמן מקובץ לפי משימה (issue), כל קבוצה אקורדיון עם מזהה+סטטוס+מונה.

Backend (#215 — מניעת הצטברות pending):
- cancel_interaction: ביטול interaction בודד ישירות ל-cancelled, ללא
  wake_assignee (resolve רגיל היה מעיר את הסוכן). אין triggers על הטבלה.
- reap_stale_interactions: reaper שמבטל pending על issues סגורים
  (done/cancelled) — המקור הדומיננטי לערימה. רץ כל 15 דק' ב-lifespan.
- endpoint POST /api/cases/{case}/agents/interaction-dismiss (מאחורי כפתור
  "התעלם"). הכל דרך agent_platform_port (G12).

supersede-at-creation נדחה (תועד ב-#215): ביטול-אוטומטי של שאלה על issue
פעיל אחד על-פני אחר אינו דטרמיניסטי; הליבה הבטוחה = reaper-ליתומים +
כפתור-ביטול, והשורש האמיתי הוא ריסון לולאות-recovery של Paperclip.

Invariants: מקיים G12 (מגע-Paperclip רק דרך הפורט), G2 (אין מסלול מקביל —
מרחיב את endpoints הסוכנים הקיימים), §6 (אין בליעת-שגיאות שקטה — הביטול
מחזיר {ok,error}, ה-reaper מתעד warning).

Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>

web-ui/src/components/cases/agent-activity-feed.tsx

@@ -9,6 +9,7 @@ import {
   useAgentActivity,
   useSendComment,
   useSubmitInteraction,
+  useDismissInteraction,
 } from "@/lib/api/agents";
 import type {
   Interaction,
@@ -17,6 +18,7 @@ import type {
   InteractionTask,
   PaperclipComment,
   PaperclipAgentStatus,
+  PaperclipIssue,
 } from "@/lib/api/agents";
 import { formatRelative } from "@/lib/format-date";
 import { toast } from "sonner";
@@ -30,6 +32,8 @@ import {
   CheckCircle2,
   XCircle,
   HelpCircle,
+  ChevronDown,
+  Ban,
 } from "lucide-react";
 
 /* ── Role → color mapping ────────────────────────────────────── */
@@ -111,34 +115,9 @@ function agentStatusTone(s: string) {
       : "bg-rule-soft text-ink-muted";
 }
 
-function AgentRoster({
-  agents,
-  comments,
-}: {
-  agents: PaperclipAgentStatus[];
-  comments: PaperclipComment[];
-}) {
+function AgentRoster({ agents }: { agents: PaperclipAgentStatus[] }) {
   if (!agents.length) return null;
 
-  // "current activity" per agent = its most recent comment body (by name/role).
-  const latest = new Map<string, string>();
-  for (const a of agents) {
-    let best: PaperclipComment | null = null;
-    let bestAt = -1;
-    for (const c of comments) {
-      const mine =
-        (c.agent_name && c.agent_name === a.name) ||
-        (c.agent_role && c.agent_role === a.role);
-      if (!mine) continue;
-      const at = c.created_at ? new Date(c.created_at).getTime() : 0;
-      if (at >= bestAt) {
-        bestAt = at;
-        best = c;
-      }
-    }
-    if (best) latest.set(a.id, best.body);
-  }
-
   const activeCount = agents.filter((a) => agentIsActive(a.status)).length;
 
   return (
@@ -150,28 +129,28 @@ function AgentRoster({
           <b className="text-success font-bold">{activeCount} פעילים</b> מתוך {agents.length}
         </span>
       </div>
-      <div className="grid gap-2 sm:grid-cols-2 lg:grid-cols-3 xl:grid-cols-5">
+      {/* Compact roster — all agents on one row (mockup 18i v2): status · name ·
+          role only. The per-agent "current activity" line was removed: it
+          matched comments by role-fallback, so agents sharing a role showed the
+          same text. */}
+      <div className="grid gap-1.5 grid-cols-3 sm:grid-cols-5 lg:grid-cols-9">
         {agents.map((a) => {
           const active = agentIsActive(a.status);
-          const activity = latest.get(a.id);
           return (
             <div
               key={a.id}
-              className={`rounded-lg border p-2.5 ${active ? "border-success/40 bg-success-bg/40" : "border-rule bg-surface"}`}
+              className={`rounded-lg border p-2 min-w-0 ${active ? "border-success/40 bg-success-bg/40" : "border-rule bg-surface"}`}
             >
-              <div className="flex items-center gap-1.5">
-                <span className={`w-2 h-2 rounded-full shrink-0 ${agentStatusDot(a.status)}`} />
-                <span className="text-[0.78rem] font-bold text-navy truncate">{a.name}</span>
-                <span
-                  className={`ms-auto text-[0.6rem] font-bold rounded-full px-1.5 py-0.5 whitespace-nowrap ${agentStatusTone(a.status)}`}
-                >
-                  {AGENT_STATUS_LABEL[a.status] ?? a.status}
-                </span>
-              </div>
-              <div className="text-[0.66rem] text-ink-muted mt-0.5">{roleLabel(a.role)}</div>
-              <div className="text-[0.7rem] text-ink-soft mt-1.5 line-clamp-2 leading-tight">
-                {activity || "—"}
+              <div className="flex items-center gap-1.5 min-w-0">
+                <span className={`w-1.5 h-1.5 rounded-full shrink-0 ${agentStatusDot(a.status)}`} />
+                <span className="text-[0.72rem] font-bold text-navy truncate">{a.name}</span>
               </div>
+              <div className="text-[0.6rem] text-ink-muted mt-0.5 truncate">{roleLabel(a.role)}</div>
+              <span
+                className={`inline-block mt-1 text-[0.55rem] font-bold rounded-full px-1.5 py-0.5 whitespace-nowrap ${agentStatusTone(a.status)}`}
+              >
+                {AGENT_STATUS_LABEL[a.status] ?? a.status}
+              </span>
             </div>
           );
         })}
@@ -605,15 +584,21 @@ function InteractionCard({
   interaction,
   caseNumber,
   issueMap,
+  defaultOpen = true,
 }: {
   interaction: Interaction;
   caseNumber: string;
   issueMap: Map<string, string>;
+  defaultOpen?: boolean;
 }) {
   const submit = useSubmitInteraction(caseNumber);
+  const dismiss = useDismissInteraction(caseNumber);
   const identifier = issueMap.get(interaction.issue_id) ?? "";
   const isPending = interaction.status === "pending";
   const summary = summaryAnswer(interaction);
+  // Pending interactions collapse into an accordion (mockup 18i v2); resolved
+  // ones always render their one-line summary.
+  const [open, setOpen] = useState(defaultOpen);
 
   const send = (action: "respond" | "accept" | "reject", payload: InteractionPayload | Record<string, unknown>) => {
     submit.mutate(
@@ -630,6 +615,16 @@ function InteractionCard({
     );
   };
 
+  const handleDismiss = () => {
+    dismiss.mutate(
+      { issue_id: interaction.issue_id, interaction_id: interaction.id },
+      {
+        onSuccess: () => toast.success("הבקשה בוטלה"),
+        onError: () => toast.error("שגיאה בביטול הבקשה"),
+      },
+    );
+  };
+
   return (
     <div
       className={`group relative flex gap-3 py-3 px-2 rounded-lg border transition-colors ${
@@ -652,15 +647,30 @@ function InteractionCard({
 
       <div className="flex-1 min-w-0">
         <div className="flex items-center gap-2 mb-2 flex-wrap">
-          <span className="text-sm font-semibold text-navy">
-            {interaction.title || "שאלה לסוכן"}
-          </span>
           {isPending ? (
-            <span className="inline-flex items-center gap-1 text-[11px] px-2 py-0.5 rounded-full border border-amber-300 bg-amber-100 text-amber-800">
-              ממתין לתשובה
-            </span>
+            <button
+              type="button"
+              onClick={() => setOpen((o) => !o)}
+              aria-expanded={open}
+              className="flex items-center gap-2 flex-wrap text-start min-w-0"
+            >
+              <ChevronDown
+                className={`w-4 h-4 text-ink-faint shrink-0 transition-transform ${open ? "rotate-180" : ""}`}
+              />
+              <span className="text-sm font-semibold text-navy">
+                {interaction.title || "שאלה לסוכן"}
+              </span>
+              <span className="inline-flex items-center gap-1 text-[11px] px-2 py-0.5 rounded-full border border-amber-300 bg-amber-100 text-amber-800">
+                ממתין לתשובה
+              </span>
+            </button>
           ) : (
-            <ResolvedBadge status={interaction.status} />
+            <>
+              <span className="text-sm font-semibold text-navy">
+                {interaction.title || "שאלה לסוכן"}
+              </span>
+              <ResolvedBadge status={interaction.status} />
+            </>
           )}
           {identifier && (
             <Badge variant="outline" className="text-[10px] font-mono">
@@ -671,39 +681,58 @@ function InteractionCard({
             <Clock className="w-3 h-3" />
             {timeAgo(interaction.resolved_at ?? interaction.created_at)}
           </span>
+          {isPending && (
+            <Button
+              size="sm"
+              variant="ghost"
+              onClick={handleDismiss}
+              disabled={dismiss.isPending}
+              className="h-7 px-2 text-ink-muted hover:text-danger"
+              title="בטל בקשה כפולה/מיושנת — ללא העברה לסוכן"
+            >
+              {dismiss.isPending ? (
+                <Loader2 className="w-3.5 h-3.5 animate-spin" />
+              ) : (
+                <Ban className="w-3.5 h-3.5 me-1" />
+              )}
+              התעלם
+            </Button>
+          )}
         </div>
 
-        {interaction.summary && (
+        {interaction.summary && (!isPending || open) && (
           <div className="text-xs text-ink-faint mb-2">{interaction.summary}</div>
         )}
 
         {isPending ? (
-          interaction.kind === "ask_user_questions" ? (
-            <AskUserQuestionsForm
-              interaction={interaction}
-              onSubmit={(answers) => send("respond", { answers })}
-              pending={submit.isPending}
-            />
-          ) : interaction.kind === "request_confirmation" ? (
-            <RequestConfirmationForm
-              interaction={interaction}
-              onAccept={() => send("accept", {})}
-              onReject={(reason) =>
-                send("reject", reason ? { reason } : {})
-              }
-              pending={submit.isPending}
-            />
-          ) : interaction.kind === "suggest_tasks" ? (
-            <SuggestTasksForm
-              interaction={interaction}
-              onAccept={(keys) =>
-                send("accept", keys.length ? { selectedClientKeys: keys } : {})
-              }
-              onReject={(reason) =>
-                send("reject", reason ? { reason } : {})
-              }
-              pending={submit.isPending}
-            />
+          open ? (
+            interaction.kind === "ask_user_questions" ? (
+              <AskUserQuestionsForm
+                interaction={interaction}
+                onSubmit={(answers) => send("respond", { answers })}
+                pending={submit.isPending}
+              />
+            ) : interaction.kind === "request_confirmation" ? (
+              <RequestConfirmationForm
+                interaction={interaction}
+                onAccept={() => send("accept", {})}
+                onReject={(reason) =>
+                  send("reject", reason ? { reason } : {})
+                }
+                pending={submit.isPending}
+              />
+            ) : interaction.kind === "suggest_tasks" ? (
+              <SuggestTasksForm
+                interaction={interaction}
+                onAccept={(keys) =>
+                  send("accept", keys.length ? { selectedClientKeys: keys } : {})
+                }
+                onReject={(reason) =>
+                  send("reject", reason ? { reason } : {})
+                }
+                pending={submit.isPending}
+              />
+            ) : null
           ) : null
         ) : summary ? (
           <div className="text-sm">
@@ -715,6 +744,80 @@ function InteractionCard({
   );
 }
 
+/* ── Issue group (timeline grouped by issue, accordion) ──────── */
+
+type FeedItem =
+  | { kind: "comment"; at: number; comment: PaperclipComment }
+  | { kind: "interaction"; at: number; interaction: Interaction };
+
+/** Drop the "[ערר 1043-02-26] " prefix Paperclip puts on every issue title. */
+function shortIssueTitle(title: string): string {
+  return title.replace(/^\s*\[[^\]]*\]\s*/, "").trim() || title;
+}
+
+function IssueGroup({
+  issue,
+  items,
+  caseNumber,
+  issueMap,
+  defaultOpen,
+}: {
+  issue: PaperclipIssue;
+  items: FeedItem[];
+  caseNumber: string;
+  issueMap: Map<string, string>;
+  defaultOpen: boolean;
+}) {
+  const [open, setOpen] = useState(defaultOpen);
+  const closed = issue.status === "done" || issue.status === "cancelled";
+  return (
+    <div className="border-b border-rule-soft last:border-b-0">
+      <button
+        type="button"
+        onClick={() => setOpen((o) => !o)}
+        aria-expanded={open}
+        className="w-full flex items-center gap-2 px-2 py-2.5 hover:bg-sand-soft/50 text-start"
+      >
+        <Badge
+          variant={closed ? "secondary" : "default"}
+          className="text-[10px] font-mono shrink-0"
+        >
+          {issue.identifier}
+        </Badge>
+        <span className="text-[0.78rem] font-semibold text-navy truncate">
+          {shortIssueTitle(issue.title)}
+        </span>
+        <span className="text-[0.7rem] text-ink-muted whitespace-nowrap">
+          {issueStatusLabel(issue.status)} · {items.length}
+        </span>
+        <ChevronDown
+          className={`w-4 h-4 ms-auto text-ink-faint shrink-0 transition-transform ${open ? "rotate-180" : ""}`}
+        />
+      </button>
+      {open && (
+        <div className="pb-1">
+          {items.map((item) =>
+            item.kind === "comment" ? (
+              <CommentCard
+                key={`c-${item.comment.id}`}
+                comment={item.comment}
+                issueMap={issueMap}
+              />
+            ) : (
+              <InteractionCard
+                key={`i-${item.interaction.id}`}
+                interaction={item.interaction}
+                caseNumber={caseNumber}
+                issueMap={issueMap}
+              />
+            ),
+          )}
+        </div>
+      )}
+    </div>
+  );
+}
+
 /* ── Main Feed ───────────────────────────────────────────────── */
 
 export function AgentActivityFeed({
@@ -792,25 +895,42 @@ export function AgentActivityFeed({
   // NOT repeated in the timeline below.
   const pending = interactions.filter((i) => i.status === "pending");
 
-  // Unified, time-sorted feed: comments + interactions interleaved.
-  type FeedItem =
-    | { kind: "comment"; at: number; comment: PaperclipComment }
-    | { kind: "interaction"; at: number; interaction: Interaction };
-
-  const feed: FeedItem[] = [
-    ...comments.map<FeedItem>((c) => ({
+  // Group the timeline by issue, each an accordion (mockup 18i v2). Comments +
+  // resolved interactions; pending ones are surfaced above and not repeated.
+  const itemsByIssue = new Map<string, FeedItem[]>();
+  const pushItem = (issueId: string, item: FeedItem) => {
+    const arr = itemsByIssue.get(issueId);
+    if (arr) arr.push(item);
+    else itemsByIssue.set(issueId, [item]);
+  };
+  for (const c of comments) {
+    pushItem(c.issue_id, {
       kind: "comment",
       at: c.created_at ? new Date(c.created_at).getTime() : 0,
       comment: c,
-    })),
-    ...interactions
-      .filter((i) => i.status !== "pending")
-      .map<FeedItem>((i) => ({
-        kind: "interaction",
-        at: i.created_at ? new Date(i.created_at).getTime() : 0,
-        interaction: i,
-      })),
-  ].sort((a, b) => a.at - b.at);
+    });
+  }
+  for (const i of interactions) {
+    if (i.status === "pending") continue;
+    pushItem(i.issue_id, {
+      kind: "interaction",
+      at: i.created_at ? new Date(i.created_at).getTime() : 0,
+      interaction: i,
+    });
+  }
+  for (const arr of itemsByIssue.values()) arr.sort((a, b) => a.at - b.at);
+
+  // Order groups by most-recent activity so live work floats to the top.
+  const issueGroups = data.issues
+    .map((iss) => {
+      const items = itemsByIssue.get(iss.id) ?? [];
+      const maxAt = items.reduce((m, it) => Math.max(m, it.at), 0);
+      return { iss, items, maxAt };
+    })
+    .filter((g) => g.items.length > 0)
+    .sort((a, b) => b.maxAt - a.maxAt);
+
+  const totalFeedItems = issueGroups.reduce((n, g) => n + g.items.length, 0);
 
   // An issue is "active" if it's not done/cancelled. When everything is closed
   // we should NOT show the "agents are working, waiting for report" spinner.
@@ -820,11 +940,11 @@ export function AgentActivityFeed({
 
   return (
     <div className="flex flex-col h-full">
-      {/* agent roster — who's doing what right now (mockup 18i) */}
-      <AgentRoster agents={data.agents ?? []} comments={comments} />
+      {/* agent roster — who's who, compact one-row (mockup 18i v2) */}
+      <AgentRoster agents={data.agents ?? []} />
 
-      {/* pending interactions surfaced to the top — the actual forms, not a
-          pointer (mockup 18i — awaiting you). Excluded from the timeline. */}
+      {/* pending interactions surfaced to the top — each an accordion, first
+          open (mockup 18i v2 — awaiting you). Excluded from the timeline. */}
       {pending.length > 0 && (
         <div className="mb-3 rounded-lg border border-amber-300 bg-amber-50 p-3 space-y-2">
           <div className="flex items-center gap-2 text-[0.82rem] font-bold text-amber-800">
@@ -834,33 +954,29 @@ export function AgentActivityFeed({
               {pending.length}
             </span>
           </div>
-          {pending.map((i) => (
+          {pending.map((i, idx) => (
             <InteractionCard
               key={`pending-${i.id}`}
               interaction={i}
               caseNumber={caseNumber}
               issueMap={issueMap}
+              defaultOpen={idx === 0}
             />
           ))}
         </div>
       )}
 
-      {/* Issue summary bar */}
-      <div className="flex items-center gap-2 px-2 py-2 border-b border-rule mb-2 flex-wrap">
-        {data.issues.map((iss) => (
-          <Badge
-            key={iss.id}
-            variant={iss.status === "done" ? "secondary" : "default"}
-            className="text-[11px] font-mono"
-          >
-            {iss.identifier} — {issueStatusLabel(iss.status)}
-          </Badge>
-        ))}
+      {/* Timeline header */}
+      <div className="flex items-center gap-2 px-2 py-2 border-b border-rule mb-1">
+        <span className="text-[0.82rem] font-bold text-navy">פעילות לפי משימה</span>
+        <span className="text-[0.72rem] text-ink-muted">
+          {data.issues.length} משימות · {totalFeedItems} הודעות
+        </span>
       </div>
 
-      {/* Comments + interactions stream */}
-      <div className="flex-1 overflow-y-auto max-h-[500px] space-y-1 px-1">
-        {feed.length === 0 ? (
+      {/* Per-issue accordions */}
+      <div className="flex-1 overflow-y-auto max-h-[500px]">
+        {totalFeedItems === 0 ? (
           hasActiveIssue ? (
             <div className="text-center py-8 text-ink-faint text-sm">
               <Loader2 className="w-5 h-5 animate-spin mx-auto mb-2" />
@@ -873,22 +989,19 @@ export function AgentActivityFeed({
             </div>
           )
         ) : (
-          feed.map((item) =>
-            item.kind === "comment" ? (
-              <CommentCard
-                key={`c-${item.comment.id}`}
-                comment={item.comment}
-                issueMap={issueMap}
-              />
-            ) : (
-              <InteractionCard
-                key={`i-${item.interaction.id}`}
-                interaction={item.interaction}
-                caseNumber={caseNumber}
-                issueMap={issueMap}
-              />
-            ),
-          )
+          issueGroups.map(({ iss, items }, idx) => (
+            <IssueGroup
+              key={iss.id}
+              issue={iss}
+              items={items}
+              caseNumber={caseNumber}
+              issueMap={issueMap}
+              defaultOpen={
+                idx === 0 ||
+                (iss.status !== "done" && iss.status !== "cancelled")
+              }
+            />
+          ))
         )}
         <div ref={endRef} />
       </div>

web-ui/src/lib/api/agents.ts

@@ -180,6 +180,26 @@ export function useSubmitInteraction(caseNumber: string | undefined) {
   });
 }
 
+/** Dismiss a pending interaction WITHOUT waking the issue assignee — used for
+ * stale/duplicate questions. Backend marks it `cancelled` directly (the
+ * `wake_assignee` continuation policy means a normal resolve would wake the
+ * agent; dismiss must not). */
+export function useDismissInteraction(caseNumber: string | undefined) {
+  const qc = useQueryClient();
+  return useMutation({
+    mutationFn: (vars: { issue_id: string; interaction_id: string }) =>
+      apiRequest<{ ok: boolean; cancelled: boolean }>(
+        `/api/cases/${caseNumber}/agents/interaction-dismiss`,
+        { method: "POST", body: vars },
+      ),
+    onSuccess: () => {
+      if (caseNumber) {
+        qc.invalidateQueries({ queryKey: agentKeys.activity(caseNumber) });
+      }
+    },
+  });
+}
+
 export type AgentResetResult = {
   ok: boolean;
   reassigned_issues: { id: string; identifier: string }[];

web/agent_platform_port.py

@@ -37,6 +37,7 @@ from web.paperclip_client import (
     COMPANIES as PAPERCLIP_COMPANIES,
     accept_interaction as pc_accept_interaction,
     archive_project as pc_archive_project,
+    cancel_interaction as pc_cancel_interaction,
     cancel_run as pc_cancel_run,
     create_project as pc_create_project,
     create_workflow_issue as pc_create_workflow_issue,
@@ -50,6 +51,7 @@ from web.paperclip_client import (
     get_run_log as pc_get_run_log,
     list_live_runs as pc_list_live_runs,
     post_comment as pc_post_comment,
+    reap_stale_interactions as pc_reap_stale_interactions,
     reject_interaction as pc_reject_interaction,
     reset_agent_session as pc_reset_agent_session,
     reset_case_agents as pc_reset_case_agents,
@@ -111,6 +113,8 @@ __all__ = [
     "pc_accept_interaction",
     "pc_reject_interaction",
     "pc_respond_to_interaction",
+    "pc_cancel_interaction",
+    "pc_reap_stale_interactions",
     # agent-run observability + control (live view + smart management)
     "pc_list_live_runs",
     "pc_get_run_log",

web/app.py

@@ -57,6 +57,7 @@ from web.agent_platform_port import (
     get_project_url,
     pc_accept_interaction,
     pc_archive_project,
+    pc_cancel_interaction,
     pc_cancel_run,
     pc_create_project,
     pc_create_workflow_issue,
@@ -69,6 +70,7 @@ from web.agent_platform_port import (
     pc_get_run_log,
     pc_list_live_runs,
     pc_post_comment,
+    pc_reap_stale_interactions,
     pc_reject_interaction,
     pc_request,
     pc_reset_agent_session,
@@ -101,19 +103,38 @@ PROGRESS_TTL_SECONDS = 300
 _progress = ProgressStore(config.REDIS_URL, ttl_seconds=PROGRESS_TTL_SECONDS)
 
 
+async def _interaction_reaper_loop():
+    """Safety-net reaper for stranded pending interactions (TaskMaster #215).
+
+    Every 15 min, cancel pending interactions on closed (done/cancelled) issues
+    so the chair's "awaiting you" count never accumulates dead questions.
+    """
+    while True:
+        try:
+            await asyncio.sleep(900)
+            await pc_reap_stale_interactions()
+        except asyncio.CancelledError:
+            raise
+        except Exception:
+            logger.warning("interaction reaper sweep failed", exc_info=True)
+
+
 @asynccontextmanager
 async def lifespan(app: FastAPI):
     UPLOAD_DIR.mkdir(parents=True, exist_ok=True)
     await db.init_schema()
     sync_task = asyncio.create_task(git_sync.sweep_loop())
+    reaper_task = asyncio.create_task(_interaction_reaper_loop())
     try:
         yield
     finally:
         sync_task.cancel()
-        try:
-            await sync_task
-        except asyncio.CancelledError:
-            pass
+        reaper_task.cancel()
+        for _t in (sync_task, reaper_task):
+            try:
+                await _t
+            except asyncio.CancelledError:
+                pass
         await db.close_pool()
         await _progress.close()
 
@@ -4411,6 +4432,30 @@ async def api_post_interaction_response(
         raise HTTPException(502, f"שגיאת Paperclip: {e}")
 
 
+class InteractionDismissRequest(BaseModel):
+    issue_id: str
+    interaction_id: str
+
+
+@app.post("/api/cases/{case_number}/agents/interaction-dismiss")
+async def api_dismiss_interaction(
+    case_number: str, req: InteractionDismissRequest,
+):
+    """Dismiss a pending interaction WITHOUT waking the issue assignee.
+
+    For stale/duplicate questions (TaskMaster #215). Unlike interaction-response,
+    this does not resolve via Paperclip's wake_assignee path — it cancels the row
+    so the chair can clear noise without triggering an agent run.
+    """
+    issues = await pc_get_case_issues(case_number)
+    if not any(i["id"] == req.issue_id for i in issues):
+        raise HTTPException(404, f"Issue {req.issue_id} לא שייך לתיק {case_number}")
+    result = await pc_cancel_interaction(req.issue_id, req.interaction_id)
+    if not result.get("ok"):
+        raise HTTPException(404, result.get("error", "ביטול הבקשה נכשל"))
+    return result
+
+
 @app.post("/api/cases/{case_number}/agents/reset")
 async def api_reset_case_agents(case_number: str):
     """Reset stuck agents for a case.

web/paperclip_client.py

@@ -899,6 +899,69 @@ async def reject_interaction(
     return resp.json()
 
 
+async def cancel_interaction(issue_id: str, interaction_id: str) -> dict:
+    """Dismiss a pending interaction WITHOUT waking the issue assignee.
+
+    For stale/duplicate questions (TaskMaster #215). We flip the row to
+    ``cancelled`` directly rather than calling Paperclip's resolve endpoints:
+    those carry the interaction's ``wake_assignee`` continuation policy and would
+    re-wake the agent. A direct status flip has no side effects — the table has
+    no triggers (verified) and nothing reaps ``cancelled`` rows.
+    """
+    conn = await asyncpg.connect(PAPERCLIP_DB_URL)
+    try:
+        row = await conn.fetchrow(
+            """UPDATE issue_thread_interactions
+                  SET status='cancelled', resolved_at=now(),
+                      resolved_by_user_id=$3, updated_at=now()
+                WHERE id=$1::uuid AND issue_id=$2::uuid AND status='pending'
+            RETURNING id, status""",
+            interaction_id, issue_id, CHAIM_USER_ID,
+        )
+    finally:
+        await conn.close()
+    if not row:
+        return {
+            "ok": False,
+            "cancelled": False,
+            "error": "interaction not found or already resolved",
+        }
+    return {"ok": True, "cancelled": True, "id": str(row["id"]), "status": row["status"]}
+
+
+async def reap_stale_interactions() -> dict:
+    """Cancel pending interactions stranded on closed issues (done/cancelled).
+
+    Safety-net reaper (TaskMaster #215): a question on a closed issue can never
+    be answered and only inflates the chair's "awaiting you" count — this was the
+    dominant source of the pending pile-up. Scoped to the two legal-ai companies.
+    Direct status flip — no wakeups, no side effects.
+    """
+    company_ids = list(COMPANIES.values())
+    conn = await asyncpg.connect(PAPERCLIP_DB_URL)
+    try:
+        rows = await conn.fetch(
+            """UPDATE issue_thread_interactions it
+                  SET status='cancelled', resolved_at=now(),
+                      resolved_by_user_id=$2, updated_at=now()
+                 FROM issues i
+                WHERE i.id = it.issue_id
+                  AND it.status='pending'
+                  AND it.company_id = ANY($1::uuid[])
+                  AND i.status IN ('done', 'cancelled')
+            RETURNING it.id""",
+            company_ids, CHAIM_USER_ID,
+        )
+    finally:
+        await conn.close()
+    if rows:
+        logger.info(
+            "reap_stale_interactions: cancelled %d stranded pending interactions",
+            len(rows),
+        )
+    return {"ok": True, "cancelled": len(rows)}
+
+
 # Singleton project for the precedent-library extraction queue. One issue per
 # uploaded precedent — assigned to the CEO who runs the local-MCP extractor.
 _LIBRARY_PROJECT_NAME = "ספריית פסיקה — תור חילוץ"