fix(anthropic-recovery): add session timeout cleanup helpers

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

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

src/hooks/anthropic-context-window-limit-recovery/session-timeout-map.ts

@@ -0,0 +1,20 @@
+export function clearSessionTimeout(
+  timeoutBySession: Map<string, ReturnType<typeof setTimeout>>,
+  sessionID: string,
+): void {
+  const timeoutID = timeoutBySession.get(sessionID)
+  if (timeoutID !== undefined) {
+    clearTimeout(timeoutID)
+    timeoutBySession.delete(sessionID)
+  }
+}
+
+export function clearAllSessionTimeouts(
+  timeoutBySession: Map<string, ReturnType<typeof setTimeout>>,
+): void {
+  for (const timeoutID of timeoutBySession.values()) {
+    clearTimeout(timeoutID)
+  }
+
+  timeoutBySession.clear()
+}