fix(ulw-loop): retry parent session after failed verification

Ultraworked with [Sisyphus](https://github.com/code-yeongyu/oh-my-opencode)

Co-authored-by: Sisyphus <clio-agent@sisyphuslabs.ai>

src/hooks/ralph-loop/continuation-prompt-builder.ts

@@ -31,6 +31,20 @@ REQUIRED NOW:
 Original task:
 {{PROMPT}}`
 
+const ULTRAWORK_VERIFICATION_FAILED_PROMPT = `${SYSTEM_DIRECTIVE_PREFIX} - ULTRAWORK LOOP VERIFICATION FAILED {{ITERATION}}/{{MAX}}]
+
+Oracle did not emit <promise>VERIFIED</promise>. Verification failed.
+
+REQUIRED NOW:
+- Verification failed. Fix the task until Oracle's review is satisfied
+- Oracle does not lie. Treat the verification result as ground truth
+- Do not claim completion early or argue with the failed verification
+- After fixing the remaining issues, request Oracle review again using task(subagent_type="oracle", load_skills=[], run_in_background=false, ...)
+- Only when the work is ready for review again, output: <promise>{{PROMISE}}</promise>
+
+Original task:
+{{PROMPT}}`
+
 export function buildContinuationPrompt(state: RalphLoopState): string {
 	const template = state.verification_pending
 		? ULTRAWORK_VERIFICATION_PROMPT
@@ -46,3 +60,15 @@ export function buildContinuationPrompt(state: RalphLoopState): string {
 
 	return state.ultrawork ? `ultrawork ${continuationPrompt}` : continuationPrompt
 }
+
+export function buildVerificationFailurePrompt(state: RalphLoopState): string {
+	const continuationPrompt = ULTRAWORK_VERIFICATION_FAILED_PROMPT.replace(
+		"{{ITERATION}}",
+		String(state.iteration),
+	)
+		.replace("{{MAX}}", getMaxIterationsLabel(state))
+		.replace("{{PROMISE}}", state.completion_promise)
+		.replace("{{PROMPT}}", state.prompt)
+
+	return state.ultrawork ? `ultrawork ${continuationPrompt}` : continuationPrompt
+}