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/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 ?? ""}`