fix: allow failed code agent sessions to resume

internal/cloud/code-agent-agentrun-adapter.ts

@@ -1456,13 +1456,14 @@ function agentRunResultToCodeAgentPayload({ base, result, traceStore, traceId, a
     });
   }
   const partialContext = partialAgentRunContext(runnerTrace);
+  const resumableAfterFailure = !canceled && Boolean(safeOpaqueId(base.threadId ?? base.agentRun?.threadId));
   return {
     ...base,
     status: canceled ? "canceled" : "failed",
     canceled,
     updatedAt: now,
     session: agentRunSessionSummary(base, canceled ? "canceled" : "failed"),
-    sessionReuse: agentRunSessionReuseSummary(base, base.agentRun.reused === true, { status: canceled ? undefined : "failed-requires-new-session" }),
+    sessionReuse: agentRunSessionReuseSummary(base, base.agentRun.reused === true, { status: canceled ? undefined : resumableAfterFailure ? "failed-resumable" : "failed-requires-new-session" }),
     runner: agentRunRunnerSummary(base.agentRun),
     runnerTrace: partialContext ? { ...runnerTrace, partialContext } : runnerTrace,
     toolCalls: agentRunToolCalls(result, canceled ? "canceled" : "failed"),
@@ -1489,8 +1490,8 @@ function agentRunResultToCodeAgentPayload({ base, result, traceStore, traceId, a
       route: "/v1/agent/chat",
       toolName: "agentrun.manual-dispatch"
     },
-    agentRun: { ...base.agentRun, terminalStatus, completed: false, reuseEligible: false, providerTrace, valuesPrinted: false },
-    reuseEligible: false,
+    agentRun: { ...base.agentRun, terminalStatus, completed: false, reuseEligible: resumableAfterFailure, providerTrace, valuesPrinted: false },
+    reuseEligible: resumableAfterFailure,
     ...(partialContext ? { partialContext } : {}),
     valuesPrinted: false
   };