feat: add Honcho AI-native memory integration

Opt-in persistent cross-session user modeling via Honcho. Reads
~/.honcho/config.json as single source of truth (shared with
Claude Code, Cursor, and other Honcho-enabled tools). Zero impact
when disabled or unconfigured.

- honcho_integration/ package (client, session manager, peer resolution)
- Host-based config resolution matching claude-honcho/cursor-honcho pattern
- Prefetch user context into system prompt per conversation turn
- Sync user/assistant messages to Honcho after each exchange
- query_user_context tool for mid-conversation dialectic reasoning
- Gated activation: requires ~/.honcho/config.json with enabled=true

toolsets.py

@@ -60,6 +60,8 @@ _HERMES_CORE_TOOLS = [
     "schedule_cronjob", "list_cronjobs", "remove_cronjob",
     # Cross-platform messaging (gated on gateway running via check_fn)
     "send_message",
+    # Honcho user context (gated on honcho being active via check_fn)
+    "query_user_context",
 ]
 
 
@@ -185,6 +187,12 @@ TOOLSETS = {
         "tools": ["delegate_task"],
         "includes": []
     },
+
+    "honcho": {
+        "description": "Honcho AI-native memory for persistent cross-session user modeling",
+        "tools": ["query_user_context"],
+        "includes": []
+    },
     
     
     # Scenario-specific toolsets