fix(ralph-loop): detect promise tags in tool_result parts for ulw verification

Oracle's <promise>VERIFIED</promise> arrives as a tool_result part from the
task() tool call, not as a text part. Both detectCompletionInSessionMessages
and collectAssistantText only scanned type=text parts, missing the
verification signal entirely. This caused ulw loops to fail verification
even when Oracle successfully emitted VERIFIED.

Include tool_result parts in promise detection alongside text parts.
Exclude tool_use parts to avoid false positives from instructional text.

src/hooks/ralph-loop/completion-promise-detector.test.ts

@@ -108,4 +108,80 @@ describe("detectCompletionInSessionMessages", () => {
       expect(detected).toBe(true)
     })
   })
+
+  describe("#given promise appears in tool_result part (not text part)", () => {
+    test("#when Oracle returns VERIFIED via task() tool_result #then should detect completion", async () => {
+      const messages: SessionMessage[] = [
+        {
+          info: { role: "assistant" },
+          parts: [
+            { type: "text", text: "Consulting Oracle for verification." },
+            { type: "tool_use", text: '{"subagent_type":"oracle"}' },
+          ],
+        },
+        {
+          info: { role: "assistant" },
+          parts: [
+            { type: "tool_result", text: 'Task completed.\n\nAgent: oracle\n\n<promise>VERIFIED</promise>\n\n<task_metadata>\nsession_id: ses_abc123\n</task_metadata>' },
+            { type: "text", text: "Oracle verified the task." },
+          ],
+        },
+      ]
+      const ctx = createPluginInput(messages)
+
+      const detected = await detectCompletionInSessionMessages(ctx, {
+        sessionID: "session-123",
+        promise: "VERIFIED",
+        apiTimeoutMs: 1000,
+        directory: "/tmp",
+        sinceMessageIndex: 0,
+      })
+
+      expect(detected).toBe(true)
+    })
+
+    test("#when DONE appears only in tool_result part #then should detect completion", async () => {
+      const messages: SessionMessage[] = [
+        {
+          info: { role: "assistant" },
+          parts: [
+            { type: "tool_result", text: 'Background task output <promise>DONE</promise>' },
+            { type: "text", text: "Task completed successfully." },
+          ],
+        },
+      ]
+      const ctx = createPluginInput(messages)
+
+      const detected = await detectCompletionInSessionMessages(ctx, {
+        sessionID: "session-123",
+        promise: "DONE",
+        apiTimeoutMs: 1000,
+        directory: "/tmp",
+      })
+
+      expect(detected).toBe(true)
+    })
+
+    test("#when promise appears in tool_use part (not tool_result) #then should NOT detect completion", async () => {
+      const messages: SessionMessage[] = [
+        {
+          info: { role: "assistant" },
+          parts: [
+            { type: "tool_use", text: 'prompt containing <promise>VERIFIED</promise> as instruction' },
+            { type: "text", text: "Calling Oracle." },
+          ],
+        },
+      ]
+      const ctx = createPluginInput(messages)
+
+      const detected = await detectCompletionInSessionMessages(ctx, {
+        sessionID: "session-123",
+        promise: "VERIFIED",
+        apiTimeoutMs: 1000,
+        directory: "/tmp",
+      })
+
+      expect(detected).toBe(false)
+    })
+  })
 })

src/hooks/ralph-loop/completion-promise-detector.ts

@@ -93,7 +93,7 @@ export async function detectCompletionInSessionMessages(
 
 			let responseText = ""
 			for (const part of assistant.parts) {
-				if (part.type !== "text") continue
+				if (part.type !== "text" && part.type !== "tool_result") continue
 				responseText += `${responseText ? "\n" : ""}${part.text ?? ""}`
 			}
 

src/hooks/ralph-loop/pending-verification-handler.ts

@@ -25,7 +25,7 @@ function collectAssistantText(message: OpenCodeSessionMessage): string {
 
 	let text = ""
 	for (const part of message.parts) {
-		if (part.type !== "text") {
+		if (part.type !== "text" && part.type !== "tool_result") {
 			continue
 		}
 		text += `${text ? "\n" : ""}${part.text ?? ""}`