refactor(context-window-recovery): split executor and storage into focused modules

Extract recovery strategies and storage management:
- recovery-strategy.ts, aggressive-truncation-strategy.ts
- summarize-retry-strategy.ts, target-token-truncation.ts
- empty-content-recovery.ts, message-builder.ts
- tool-result-storage.ts, storage-paths.ts, state.ts
- client.ts, tool-part-types.ts

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

@@ -0,0 +1,2 @@
+export { runAggressiveTruncationStrategy } from "./aggressive-truncation-strategy"
+export { runSummarizeRetryStrategy } from "./summarize-retry-strategy"