fix(readme): update

readme.memory-leaks-fixed.md

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-# Memory Leaks Fixed in SmartProxy
-
-## Summary of Issues Found and Fixed
-
-### 1. MetricsCollector - Request Timestamps Array
-**Issue**: The `requestTimestamps` array could grow to 10,000 entries before cleanup, causing unnecessary memory usage.
-**Fix**: Reduced threshold to 5,000 and more aggressive cleanup when exceeded.
-
-### 2. RouteConnectionHandler - Unused Route Context Cache
-**Issue**: Declared `routeContextCache` Map that was never used but could be confusing.
-**Fix**: Removed the unused cache and added documentation explaining why caching wasn't implemented.
-
-### 3. FunctionCache - Uncleaned Interval Timer
-**Issue**: The cache cleanup interval was never cleared, preventing proper garbage collection.
-**Fix**: Added `destroy()` method to properly clear the interval timer.
-
-### 4. HttpProxy/RequestHandler - Uncleaned Rate Limit Cleanup Timer
-**Issue**: The RequestHandler creates a setInterval for rate limit cleanup that's never cleared.
-**Status**: Needs fix - add destroy method and call it from HttpProxy.stop()
-
-## Memory Leak Test
-
-A comprehensive memory leak test was created at `test/test.memory-leak-check.node.ts` that:
-- Tests with 1000 requests to same routes
-- Tests with 1000 requests to different routes (cache growth)
-- Tests rapid 10,000 requests (timestamp array growth)
-- Monitors memory usage throughout
-- Verifies specific data structures don't grow unbounded
-
-## Recommendations
-
-1. Always use `unref()` on intervals that shouldn't keep the process alive
-2. Always provide cleanup/destroy methods for classes that create timers
-3. Implement size limits on all caches and Maps
-4. Consider using WeakMap for caches where appropriate
-5. Run memory leak tests regularly, especially after adding new features
-
-## Running the Memory Leak Test
-
-```bash
-# Run with garbage collection exposed for accurate measurements
-node --expose-gc test/test.memory-leak-check.node.ts
-```
-
-The test will monitor memory usage and fail if memory growth exceeds acceptable thresholds.