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/verification-failure-handler.ts

@@ -0,0 +1,99 @@
+import type { PluginInput } from "@opencode-ai/plugin"
+import { log } from "../../shared/logger"
+import { buildVerificationFailurePrompt } from "./continuation-prompt-builder"
+import { HOOK_NAME } from "./constants"
+import { injectContinuationPrompt } from "./continuation-prompt-injector"
+import type { RalphLoopState } from "./types"
+
+type LoopStateController = {
+	restartAfterFailedVerification: (
+		sessionID: string,
+		messageCountAtStart?: number,
+	) => RalphLoopState | null
+}
+
+function getMessageCountFromResponse(messagesResponse: unknown): number {
+	if (Array.isArray(messagesResponse)) {
+		return messagesResponse.length
+	}
+
+	if (
+		typeof messagesResponse === "object"
+		&& messagesResponse !== null
+		&& "data" in messagesResponse
+	) {
+		const data = (messagesResponse as { data?: unknown }).data
+		return Array.isArray(data) ? data.length : 0
+	}
+
+	return 0
+}
+
+async function getSessionMessageCount(
+	ctx: PluginInput,
+	sessionID: string,
+	directory: string,
+): Promise<number> {
+	const messagesResponse = await ctx.client.session.messages({
+		path: { id: sessionID },
+		query: { directory },
+	})
+
+	return getMessageCountFromResponse(messagesResponse)
+}
+
+export async function handleFailedVerification(
+	ctx: PluginInput,
+	input: {
+		state: RalphLoopState
+		directory: string
+		apiTimeoutMs: number
+		loopState: LoopStateController
+	},
+): Promise<boolean> {
+	const { state, directory, apiTimeoutMs, loopState } = input
+	const parentSessionID = state.session_id
+	if (!parentSessionID) {
+		return false
+	}
+
+	let messageCountAtStart: number
+	try {
+		messageCountAtStart = await getSessionMessageCount(ctx, parentSessionID, directory)
+	} catch (error) {
+		log(`[${HOOK_NAME}] Failed to read parent session before verification retry`, {
+			parentSessionID,
+			error: String(error),
+		})
+		return false
+	}
+
+	const resumedState = loopState.restartAfterFailedVerification(
+		parentSessionID,
+		messageCountAtStart,
+	)
+	if (!resumedState) {
+		log(`[${HOOK_NAME}] Failed to restart loop after verification failure`, {
+			parentSessionID,
+		})
+		return false
+	}
+
+	await injectContinuationPrompt(ctx, {
+		sessionID: parentSessionID,
+		prompt: buildVerificationFailurePrompt(resumedState),
+		directory,
+		apiTimeoutMs,
+	})
+
+	await ctx.client.tui?.showToast?.({
+		body: {
+			title: "ULTRAWORK LOOP",
+			message: "Oracle verification failed. Continuing ULTRAWORK loop.",
+			variant: "warning",
+			duration: 5000,
+		},
+	}).catch(() => {})
+
+	return true
+}