fix: Signal adapter parity pass — integration gaps, clawdbot features, env var simplification

Integration gaps fixed (7 files missing Signal):
- cron/scheduler.py: Signal in platform_map (cron delivery was broken)
- agent/prompt_builder.py: PLATFORM_HINTS for Signal (agent knows it's on Signal)
- toolsets.py: hermes-signal toolset + added to hermes-gateway composite
- hermes_cli/status.py: Signal + Slack in platform status display
- tools/send_message_tool.py: Signal example in target description
- tools/cronjob_tools.py: Signal in delivery option docs + schema
- gateway/channel_directory.py: Signal in session-based channel discovery

Clawdbot parity features added to signal.py:
- Self-message filtering: prevents reply loops by checking sender != account
- SyncMessage filtering: ignores sync envelopes (sent transcripts, read receipts)
- Edit message support: reads dataMessage from editMessage envelope
- Mention rendering: replaces \uFFFC placeholders with @identifier text
- Jitter in SSE reconnection backoff (20% randomization, prevents thundering herd)

Env var simplification (7 → 4):
- Removed SIGNAL_DM_POLICY (DM auth follows standard platform pattern via
  SIGNAL_ALLOWED_USERS + DM pairing, same as Telegram/Discord)
- Removed SIGNAL_GROUP_POLICY (derived from SIGNAL_GROUP_ALLOWED_USERS:
  not set = disabled, set with IDs = allowlist, set with * = open)
- Removed SIGNAL_DEBUG (was setting root logger, removed entirely)
- Remaining: SIGNAL_HTTP_URL, SIGNAL_ACCOUNT (required),
  SIGNAL_ALLOWED_USERS, SIGNAL_GROUP_ALLOWED_USERS (optional)

Updated all docs (website, AGENTS.md, signal.md) to match.

hermes_cli/gateway.py

@@ -757,42 +757,25 @@ def _setup_signal():
 
     save_env_value("SIGNAL_ALLOWED_USERS", allowed)
 
-    # DM policy
+    # Group messaging
     print()
-    policies = ["pairing (default — new users get a pairing code to approve)",
-                 "allowlist (only explicitly listed users)",
-                 "open (anyone can message)"]
-    dm_choice = prompt_choice("  DM access policy:", policies, 0)
-    dm_policy = ["pairing", "allowlist", "open"][dm_choice]
-    save_env_value("SIGNAL_DM_POLICY", dm_policy)
-
-    # Group policy
-    print()
-    group_policies = ["disabled (default — ignore group messages)",
-                      "allowlist (only specific groups)",
-                      "open (respond in any group the bot is in)"]
-    group_choice = prompt_choice("  Group message policy:", group_policies, 0)
-    group_policy = ["disabled", "allowlist", "open"][group_choice]
-    save_env_value("SIGNAL_GROUP_POLICY", group_policy)
-
-    if group_policy == "allowlist":
+    if prompt_yes_no("  Enable group messaging? (disabled by default for security)", False):
         print()
-        print_info("  Enter group IDs to allow (comma-separated).")
+        print_info("  Enter group IDs to allow, or * for all groups.")
         existing_groups = get_env_value("SIGNAL_GROUP_ALLOWED_USERS") or ""
         try:
-            groups = input(f"  Group IDs [{existing_groups}]: ").strip() or existing_groups
+            groups = input(f"  Group IDs [{existing_groups or '*'}]: ").strip() or existing_groups or "*"
         except (EOFError, KeyboardInterrupt):
             print("\n  Setup cancelled.")
             return
-        if groups:
-            save_env_value("SIGNAL_GROUP_ALLOWED_USERS", groups)
+        save_env_value("SIGNAL_GROUP_ALLOWED_USERS", groups)
 
     print()
     print_success("Signal configured!")
     print_info(f"  URL: {url}")
     print_info(f"  Account: {account}")
-    print_info(f"  DM policy: {dm_policy}")
-    print_info(f"  Group policy: {group_policy}")
+    print_info(f"  DM auth: via SIGNAL_ALLOWED_USERS + DM pairing")
+    print_info(f"  Groups: {'enabled' if get_env_value('SIGNAL_GROUP_ALLOWED_USERS') else 'disabled'}")
 
 
 def gateway_setup():

hermes_cli/status.py

@@ -206,6 +206,8 @@ def show_status(args):
         "Telegram": ("TELEGRAM_BOT_TOKEN", "TELEGRAM_HOME_CHANNEL"),
         "Discord": ("DISCORD_BOT_TOKEN", "DISCORD_HOME_CHANNEL"),
         "WhatsApp": ("WHATSAPP_ENABLED", None),
+        "Signal": ("SIGNAL_HTTP_URL", "SIGNAL_HOME_CHANNEL"),
+        "Slack": ("SLACK_BOT_TOKEN", None),
     }
     
     for name, (token_var, home_var) in platforms.items():