fix(anthropic-recovery): clear session state after successful summarize and fix timing test

- Add missing clearSessionState() call after successful summarize (line 117)
  Without this, retry state persisted even after success, potentially causing
  unnecessary retries on subsequent compaction events.

- Fix timing-sensitive test: adjust attempt=0 and firstAttemptTime to give
  proper remainingTimeMs buffer for capped delay calculation.

Fixes #2225
Supersedes #2671

src/hooks/anthropic-context-window-limit-recovery/summarize-retry-strategy.ts

@@ -114,6 +114,7 @@ export async function runSummarizeRetryStrategy(params: {
           body: summarizeBody as never,
           query: { directory: params.directory },
         })
+        clearSessionState(params.autoCompactState, params.sessionID)
         return
       } catch {
         const remainingTimeMs = SUMMARIZE_RETRY_TOTAL_TIMEOUT_MS - (Date.now() - retryState.firstAttemptTime)