feat: add SMS (Twilio) platform adapter

Add SMS as a first-class messaging platform via the Twilio API.
Shares credentials with the existing telephony skill — same
TWILIO_ACCOUNT_SID, TWILIO_AUTH_TOKEN, TWILIO_PHONE_NUMBER env vars.

Adapter (gateway/platforms/sms.py):
- aiohttp webhook server for inbound (Twilio form-encoded POSTs)
- Twilio REST API with Basic auth for outbound
- Markdown stripping, smart chunking at 1600 chars
- Echo loop prevention, phone number redaction in logs

Integration (13 files):
- gateway config, run, channel_directory
- agent prompt_builder (SMS platform hint)
- cron scheduler, cronjob tools
- send_message_tool (_send_sms via Twilio API)
- toolsets (hermes-sms + hermes-gateway)
- gateway setup wizard, status display
- pyproject.toml (sms optional extra)
- 21 tests

Docs:
- website/docs/user-guide/messaging/sms.md (full setup guide)
- Updated messaging index (architecture, toolsets, security, links)
- Updated environment-variables.md reference

Inspired by PR #1575 (@sunsakis), rewritten for Twilio.

hermes_cli/gateway.py

@@ -1039,6 +1039,33 @@ _PLATFORMS = [
              "help": "Only emails from these addresses will be processed."},
         ],
     },
+    {
+        "key": "sms",
+        "label": "SMS (Twilio)",
+        "emoji": "📱",
+        "token_var": "TWILIO_ACCOUNT_SID",
+        "setup_instructions": [
+            "1. Create a Twilio account at https://www.twilio.com/",
+            "2. Get your Account SID and Auth Token from the Twilio Console dashboard",
+            "3. Buy or configure a phone number capable of sending SMS",
+            "4. Set up your webhook URL for inbound SMS:",
+            "   Twilio Console → Phone Numbers → Active Numbers → your number",
+            "   → Messaging → A MESSAGE COMES IN → Webhook → https://your-server:8080/webhooks/twilio",
+        ],
+        "vars": [
+            {"name": "TWILIO_ACCOUNT_SID", "prompt": "Twilio Account SID", "password": False,
+             "help": "Found on the Twilio Console dashboard."},
+            {"name": "TWILIO_AUTH_TOKEN", "prompt": "Twilio Auth Token", "password": True,
+             "help": "Found on the Twilio Console dashboard (click to reveal)."},
+            {"name": "TWILIO_PHONE_NUMBER", "prompt": "Twilio phone number (E.164 format, e.g. +15551234567)", "password": False,
+             "help": "The Twilio phone number to send SMS from."},
+            {"name": "SMS_ALLOWED_USERS", "prompt": "Allowed phone numbers (comma-separated, E.164 format)", "password": False,
+             "is_allowlist": True,
+             "help": "Only messages from these phone numbers will be processed."},
+            {"name": "SMS_HOME_CHANNEL", "prompt": "Home channel phone number (for cron/notification delivery, or empty)", "password": False,
+             "help": "Phone number to deliver cron job results and notifications to."},
+        ],
+    },
 ]
 
 

hermes_cli/status.py

@@ -252,6 +252,7 @@ def show_status(args):
         "Signal": ("SIGNAL_HTTP_URL", "SIGNAL_HOME_CHANNEL"),
         "Slack": ("SLACK_BOT_TOKEN", None),
         "Email": ("EMAIL_ADDRESS", "EMAIL_HOME_ADDRESS"),
+        "SMS": ("TWILIO_ACCOUNT_SID", "SMS_HOME_CHANNEL"),
     }
     
     for name, (token_var, home_var) in platforms.items():