fix(FN-4892): harden intake auto-archive fail-open behavior

Fusion-Task-Id: FN-4892
Fusion-Task-Lineage: 6f56b468-a827-416d-ba1f-444e1326d613

packages/engine/src/self-healing.ts

@@ -67,7 +67,6 @@ export async function archiveAsGhostBug(
   taskTitle: string,
   decision: GhostBugDecision,
 ): Promise<void> {
-  await store.moveTask(taskId, "archived");
   await store.logEntry(
     taskId,
     "Auto-archived as ghost bug — cited code construct not present on main",
@@ -83,6 +82,7 @@ export async function archiveAsGhostBug(
       findings: decision.findings.slice(0, 10),
     },
   });
+  await store.moveTask(taskId, "archived");
 }
 
 async function classifyOwnedLandedEvidenceForSelfHealing(rootDir: string, task: Task, mergeTargetBranch: string): Promise<OwnedLandedClassification> {

packages/engine/src/triage-preflight.ts

@@ -106,7 +106,14 @@ export async function probeCitedConstructs(
 
       const { stdout, stderr } = await opts.exec(command, { cwd: opts.cwd, timeoutMs });
       if (construct.kind === "command") {
-        findings.push({ construct, matched: true, output: `${stdout}${stderr}`.trim() });
+        // FN-4892: command probes are intentionally non-definitive here because
+        // ProbeExec does not expose exit codes. Keep fail-open behavior.
+        findings.push({
+          construct,
+          matched: true,
+          output: `${stdout}${stderr}`.trim(),
+          probeError: "exit_code_unavailable",
+        });
         continue;
       }
       const output = `${stdout}${stderr}`.trim();