Enhance CLI with multi-platform messaging integration and configuration management

- Updated CLI to load configuration from user-specific and project-specific YAML files, prioritizing user settings.
- Introduced a new command `/platforms` to display the status of connected messaging platforms (Telegram, Discord, WhatsApp).
- Implemented a gateway system for handling messaging interactions, including session management and delivery routing for cron job outputs.
- Added support for environment variable configuration and a dedicated gateway configuration file for advanced settings.
- Enhanced documentation in README.md and added a new messaging.md file to guide users on platform integrations and setup.
- Updated toolsets to include platform-specific capabilities for Telegram, Discord, and WhatsApp, ensuring secure and tailored interactions.

gateway/__init__.py

@@ -0,0 +1,35 @@
+"""
+Hermes Gateway - Multi-platform messaging integration.
+
+This module provides a unified gateway for connecting the Hermes agent
+to various messaging platforms (Telegram, Discord, WhatsApp) with:
+- Session management (persistent conversations with reset policies)
+- Dynamic context injection (agent knows where messages come from)
+- Delivery routing (cron job outputs to appropriate channels)
+- Platform-specific toolsets (different capabilities per platform)
+"""
+
+from .config import GatewayConfig, PlatformConfig, HomeChannel, load_gateway_config
+from .session import (
+    SessionContext,
+    SessionStore,
+    SessionResetPolicy,
+    build_session_context_prompt,
+)
+from .delivery import DeliveryRouter, DeliveryTarget
+
+__all__ = [
+    # Config
+    "GatewayConfig",
+    "PlatformConfig", 
+    "HomeChannel",
+    "load_gateway_config",
+    # Session
+    "SessionContext",
+    "SessionStore",
+    "SessionResetPolicy",
+    "build_session_context_prompt",
+    # Delivery
+    "DeliveryRouter",
+    "DeliveryTarget",
+]