docs: add per package README for implementation details (AI generated with human review)

agent/cmd/README.md

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+# agent/cmd
+
+The main entry point for the GoDoxy Agent, a secure monitoring and proxy agent that runs alongside Docker containers.
+
+## Overview
+
+This package contains the `main.go` entry point for the GoDoxy Agent. The agent is a TLS-enabled server that provides:
+
+- Secure Docker socket proxying with client certificate authentication
+- HTTP proxy capabilities for container traffic
+- System metrics collection and monitoring
+- Health check endpoints
+
+## Architecture
+
+```mermaid
+graph TD
+    A[main] --> B[Logger Init]
+    A --> C[Load CA Certificate]
+    A --> D[Load Server Certificate]
+    A --> E[Log Version Info]
+    A --> F[Start Agent Server]
+    A --> G[Start Socket Proxy]
+    A --> H[Start System Info Poller]
+    A --> I[Wait Exit]
+
+    F --> F1[TLS with mTLS]
+    F --> F2[Agent Handler]
+    G --> G1[Docker Socket Proxy]
+```
+
+## Main Function Flow
+
+1. **Logger Setup**: Configures zerolog with console output
+1. **Certificate Loading**: Loads CA and server certificates for TLS/mTLS
+1. **Version Logging**: Logs agent version and configuration
+1. **Agent Server**: Starts the main HTTPS server with agent handlers
+1. **Socket Proxy**: Starts Docker socket proxy if configured
+1. **System Monitoring**: Starts system info polling
+1. **Graceful Shutdown**: Waits for exit signal (3 second timeout)
+
+## Configuration
+
+See `agent/pkg/env/README.md` for configuration options.
+
+## Dependencies
+
+- `agent/pkg/agent` - Core agent types and constants
+- `agent/pkg/env` - Environment configuration
+- `agent/pkg/server` - Server implementation
+- `socketproxy/pkg` - Docker socket proxy
+- `internal/metrics/systeminfo` - System metrics