debug: dump raw NDJSON for issue #439 investigation

Saves Claude Code stdout to /tmp/uwf-ndjson-dump/ before parsing.
Temporary — remove after root cause confirmed.

Refs #439

packages/cli-workflow/src/commands/setup.ts

@@ -141,7 +141,7 @@ function apiKeyEnvName(providerName: string): string {
  * Discover uwf-* agent binaries in PATH.
  * Returns sorted list of binary names (e.g., ["uwf-hermes", "uwf-claude-code"]).
  */
-async function discoverAgents(): Promise<string[]> {
+async function _discoverAgents(): Promise<string[]> {
   try {
     // Use which -a to find all uwf-* binaries in PATH
     const proc = Bun.spawn(["which", "-a", "uwf-hermes", "uwf-claude-code", "uwf-cursor"], {
@@ -186,12 +186,15 @@ async function discoverAgents(): Promise<string[]> {
     }
 
     // Parse which output - each line is a path to a binary
-    const paths = text.trim().split("\n").filter((line) => line.length > 0);
+    const paths = text
+      .trim()
+      .split("\n")
+      .filter((line) => line.length > 0);
     const agents = new Set<string>();
 
     for (const path of paths) {
       const basename = path.split("/").pop();
-      if (basename && basename.startsWith("uwf-") && basename !== "uwf") {
+      if (basename?.startsWith("uwf-") && basename !== "uwf") {
         agents.add(basename);
       }
     }

packages/cli-workflow/src/commands/thread.ts

@@ -539,7 +539,7 @@ function collectOrderedSteps(
 }
 
 function formatYaml(value: unknown): string {
-  return stringify(value).trimEnd();
+  return stringify(value, { aliasDuplicateObjects: false }).trimEnd();
 }
 
 function formatCompactStep(index: number, item: OrderedStepItem, outputYaml: string): string {

packages/cli-workflow/src/format.ts

@@ -7,6 +7,6 @@ export function formatOutput(data: unknown, format: OutputFormat): string {
     case "json":
       return JSON.stringify(data);
     case "yaml":
-      return stringify(data).trimEnd();
+      return stringify(data, { aliasDuplicateObjects: false }).trimEnd();
   }
 }

packages/workflow-agent-claude-code/src/claude-code.ts

@@ -1,4 +1,5 @@
 import { spawn } from "node:child_process";
+import { mkdirSync, writeFileSync } from "node:fs";
 import type { Store } from "@uncaged/json-cas";
 import {
   type AgentContext,
@@ -117,7 +118,17 @@ function spawnClaudeResume(
   ]);
 }
 
+const NDJSON_DUMP_DIR = "/tmp/uwf-ndjson-dump";
+
 async function processClaudeOutput(stdout: string, store: Store): Promise<AgentRunResult> {
+  // Debug dump: save raw NDJSON for issue #439 investigation
+  try {
+    mkdirSync(NDJSON_DUMP_DIR, { recursive: true });
+    writeFileSync(`${NDJSON_DUMP_DIR}/${Date.now()}.ndjson`, stdout);
+  } catch {
+    // ignore dump failures
+  }
+
   const parsed = parseClaudeCodeStreamOutput(stdout);
 
   if (parsed !== null) {