fix(look-at): add timeout to sync model retry to prevent process hang

Closes #2087

src/shared/prompt-timeout-context.ts

@@ -0,0 +1,49 @@
+export interface PromptTimeoutArgs {
+  signal?: AbortSignal
+}
+
+export interface PromptRetryOptions {
+  timeoutMs?: number
+}
+
+export const PROMPT_TIMEOUT_MS = 120000
+
+export function createPromptTimeoutContext(args: PromptTimeoutArgs, timeoutMs: number): {
+  signal: AbortSignal
+  wasTimedOut: () => boolean
+  cleanup: () => void
+} {
+  const timeoutController = new AbortController()
+  let timeoutID: ReturnType<typeof setTimeout> | null = null
+  let timedOut = false
+
+  const abortOnUpstreamSignal = (): void => {
+    timeoutController.abort(args.signal?.reason)
+  }
+
+  if (args.signal) {
+    if (args.signal.aborted) {
+      timeoutController.abort(args.signal.reason)
+    } else {
+      args.signal.addEventListener("abort", abortOnUpstreamSignal, { once: true })
+    }
+  }
+
+  timeoutID = setTimeout(() => {
+    timedOut = true
+    timeoutController.abort(new Error(`prompt timed out after ${timeoutMs}ms`))
+  }, timeoutMs)
+
+  return {
+    signal: timeoutController.signal,
+    wasTimedOut: () => timedOut,
+    cleanup: () => {
+      if (timeoutID !== null) {
+        clearTimeout(timeoutID)
+      }
+      if (args.signal) {
+        args.signal.removeEventListener("abort", abortOnUpstreamSignal)
+      }
+    },
+  }
+}