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/ratelimit/memory_linux.go

@@ -0,0 +1,62 @@
+//go:build linux && !(js && wasm)
+
+package ratelimit
+
+import (
+	"bufio"
+	"os"
+	"strconv"
+	"strings"
+)
+
+// ReadProcessMemoryStats reads memory statistics from /proc/self/status.
+// This provides accurate RSS (Resident Set Size) information on Linux,
+// including the breakdown between shared and anonymous memory.
+func ReadProcessMemoryStats() ProcessMemoryStats {
+	stats := ProcessMemoryStats{}
+
+	file, err := os.Open("/proc/self/status")
+	if err != nil {
+		// Fallback to runtime stats if /proc is not available
+		return readProcessMemoryStatsFallback()
+	}
+	defer file.Close()
+
+	scanner := bufio.NewScanner(file)
+	for scanner.Scan() {
+		line := scanner.Text()
+		fields := strings.Fields(line)
+		if len(fields) < 2 {
+			continue
+		}
+
+		key := strings.TrimSuffix(fields[0], ":")
+		valueStr := fields[1]
+
+		value, err := strconv.ParseUint(valueStr, 10, 64)
+		if err != nil {
+			continue
+		}
+
+		// Values in /proc/self/status are in kB
+		valueBytes := value * 1024
+
+		switch key {
+		case "VmRSS":
+			stats.VmRSS = valueBytes
+		case "RssShmem":
+			stats.RssShmem = valueBytes
+		case "RssAnon":
+			stats.RssAnon = valueBytes
+		case "VmHWM":
+			stats.VmHWM = valueBytes
+		}
+	}
+
+	// If we didn't get VmRSS, fall back to runtime stats
+	if stats.VmRSS == 0 {
+		return readProcessMemoryStatsFallback()
+	}
+
+	return stats
+}