Interim release: documentation updates and rate limiting improvements

- Add applesauce library reference documentation
- Add rate limiting test report for Badger
- Add memory monitoring for rate limiter (platform-specific implementations)
- Enhance PID-controlled adaptive rate limiting
- Update Neo4j and Badger monitors with improved load metrics
- Add docker-compose configuration
- Update README and configuration options

🤖 Generated with [Claude Code](https://claude.com/claude-code)

Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>

pkg/neo4j/neo4j.go

@@ -447,3 +447,18 @@ func (n *N) CacheEvents(f *filter.F, events event.S) {}
 
 // InvalidateQueryCache invalidates the query cache (not implemented for Neo4j)
 func (n *N) InvalidateQueryCache() {}
+
+// Driver returns the Neo4j driver for use in rate limiting.
+func (n *N) Driver() neo4j.DriverWithContext {
+	return n.driver
+}
+
+// QuerySem returns the query semaphore for use in rate limiting.
+func (n *N) QuerySem() chan struct{} {
+	return n.querySem
+}
+
+// MaxConcurrentQueries returns the maximum concurrent query limit.
+func (n *N) MaxConcurrentQueries() int {
+	return cap(n.querySem)
+}