feat(session): implement session reset policy for messaging platforms

- Added configuration options for automatic session resets based on inactivity or daily boundaries in cli-config.yaml.
- Enhanced SessionResetPolicy class to support a "none" mode for no auto-resets.
- Implemented memory flushing before session resets in SessionStore to preserve important information.
- Updated setup wizard to guide users in configuring session reset preferences.

gateway/config.py

@@ -65,8 +65,9 @@ class SessionResetPolicy:
     - "daily": Reset at a specific hour each day
     - "idle": Reset after N minutes of inactivity
     - "both": Whichever triggers first (daily boundary OR idle timeout)
+    - "none": Never auto-reset (context managed only by compression)
     """
-    mode: str = "both"  # "daily", "idle", or "both"
+    mode: str = "both"  # "daily", "idle", "both", or "none"
     at_hour: int = 4  # Hour for daily reset (0-23, local time)
     idle_minutes: int = 1440  # Minutes of inactivity before reset (24 hours)
     
@@ -264,6 +265,21 @@ def load_gateway_config() -> GatewayConfig:
         except Exception as e:
             print(f"[gateway] Warning: Failed to load {gateway_config_path}: {e}")
     
+    # Bridge session_reset from config.yaml (the user-facing config file)
+    # into the gateway config. config.yaml takes precedence over gateway.json
+    # for session reset policy since that's where hermes setup writes it.
+    try:
+        import yaml
+        config_yaml_path = Path.home() / ".hermes" / "config.yaml"
+        if config_yaml_path.exists():
+            with open(config_yaml_path) as f:
+                yaml_cfg = yaml.safe_load(f) or {}
+            sr = yaml_cfg.get("session_reset")
+            if sr and isinstance(sr, dict):
+                config.default_reset_policy = SessionResetPolicy.from_dict(sr)
+    except Exception:
+        pass
+
     # Override with environment variables
     _apply_env_overrides(config)