fix: prod triage 2026-07-08 — MCP auth residue, gateway envelopes, verb-loop cap, A2A interjection, manual spawn UX (#334)

* fix(auth): pass agent UUID to CLI-arg MCP servers (optimal/docs/search)

The container token is HMAC-signed over the agent UUID (#314), but the
optimal/docs/search MCP servers received the slug as their CLI arg and
sent X-Agent-ID=<slug>, so every research/RAG/docs call 401ed with
signature mismatch under enforced auth. Pass the already-computed
agent_uuid in the three args lists instead.

* fix(gateway): include remediate in gateway.rejected audit details

Conventions-gate rejections carry the offending file:line listing only
in the envelope's remediate field, which the audit row dropped -- ops
logs showed just the violation count with no way to see what blocked.

* fix(gateway): return envelope on do/commit git failure

A GitError from the commit verb propagated to the generic middleware
handler, so agents got a raw error blob with no remediate/next. Catch
it and return an error envelope; 'no changes added to commit' with an
explicit files list now names the mismatch and the omit-files fallback.

* fix(agent-sdk): absolute rejection cap breaks slow-drip verb loops

The verb circuit breaker only counted rejections inside a 60s sliding
window, so an agent retrying i_am_done every 3-4 minutes looped for 30+
minutes without tripping it. Add a session-scoped cumulative per-(verb,
task) cap at 3x the windowed limit that trips regardless of pacing.

* feat(a2a): CEO chime-in interjects into the viewed conversation

Previously reply_as_ceo re-homed the message into a canonical CEO<->target
conversation with no panel surface, so a chime-in reported success but was
invisible and only opportunistically delivered. interject_as_ceo now inserts
the message into the conversation being viewed (from_agent=ceo, directed via
an @target content prefix), bumps that conversation's counters with the
unread ping keyed to the addressed participant, and both participants see it
in transcript and read_a2a.

* feat(panel): manual spawn carries task + message, surfaces refusals

The agent detail page spawned with no request body (task/message impossible),
the spawn button could double-fire (2.5ms double-POST seen live), and refusal
reasons never reached the UI: readiness refusals were generic 500s and the
already-running no-op looked like success. Detail page now uses
SpawnAgentDialog, a synchronous ref guard blocks re-entry, AgentReadinessError
maps to 409 with its reason shown, already_running is signalled and toasted,
and a task_id builds a task-aware prompt instructing the claim (task_id alone
never did), with the CEO's message appended as a note.

* test(panel): align a2a page test with the interjection footer copy

The chime-in rebuild changed the composer footer; the page-level test
asserting the old copy was outside the rebuild's scoped vitest run.

* fix(api): commit the request DB session before the response is sent

FastAPI unwinds yield-dependencies after the response bytes go out, so
get_db's post-yield commit raced the client's next request -- a verb
could return ok while its claim/status write was still uncommitted (the
e2e ok-without-effect flake family), and a failed commit was silently
lost behind an already-sent 200. DbCommitMiddleware (innermost, pure
ASGI) commits the session stashed by get_db_committed before forwarding
http.response.start; commit failure now surfaces as a 5xx. get_db is
untouched for its direct non-request callers.

* fix(db): invalidate, not rollback, the session on request cancellation

With the commit moved into the send path, the flow-verb timeout can
cancel mid-commit; rolling back then issues another command over an
asyncpg connection stranded mid-wire-protocol, and the poisoned
connection segfaults uvloop/asyncpg when a later checkout recycles it
(3/3 identical CI faulthandler dumps). On CancelledError discard the
connection via session.invalidate() -- SQLAlchemy's documented handling
for a timeout during commit -- and keep rollback for plain exceptions.

---------

Co-authored-by: Renn F <rennf93@users.noreply.github.com>

panel/src/components/agents/spawn-agent-dialog.tsx

@@ -1,7 +1,8 @@
 "use client";
 
-import { useState } from "react";
+import { useRef, useState } from "react";
 import { useSpawnAgent } from "@/hooks/use-agents";
+import { getErrorMessage } from "@/lib/api/client";
 import { Button } from "@/components/ui/button";
 import { Input } from "@/components/ui/input";
 import { Label } from "@/components/ui/label";
@@ -32,21 +33,34 @@ export function SpawnAgentDialog({
   const [taskId, setTaskId] = useState("");
   const [initialPrompt, setInitialPrompt] = useState("");
   const spawnAgent = useSpawnAgent();
+  // Synchronous re-entrancy guard: `spawnAgent.isPending` only flips on a
+  // re-render, which lags a fast double-click/double-fire by a tick or two —
+  // the guard below blocks a second call within the same synchronous burst
+  // regardless of render timing.
+  const submittingRef = useRef(false);
 
   const handleSpawn = async () => {
+    if (submittingRef.current) return;
+    submittingRef.current = true;
     try {
-      await spawnAgent.mutateAsync({
+      const result = await spawnAgent.mutateAsync({
         agentId,
         request: {
           task_id: taskId || undefined,
           initial_prompt: initialPrompt || undefined,
         },
       });
-      toast.success(`Agent ${agentName} spawned successfully`);
+      if (result.already_running) {
+        toast.info(`Agent ${agentName} already running — spawn skipped`);
+      } else {
+        toast.success(`Agent ${agentName} spawned successfully`);
+      }
       setOpen(false);
       resetForm();
-    } catch {
-      toast.error("Failed to spawn agent");
+    } catch (error) {
+      toast.error(getErrorMessage(error));
+    } finally {
+      submittingRef.current = false;
     }
   };