fix(network): prevent null multiplayer peer crashes offline/teardown and fix Nakama RPC session validation

addons/godot_ai/clients/antigravity.gd

@@ -7,13 +7,20 @@ func _init() -> void:
 	display_name = "Antigravity"
 	config_type = "json"
 	doc_url = "https://www.antigravity.dev/"
+	## Antigravity moved its shared MCP config from `~/.gemini/antigravity/`
+	## to `~/.gemini/config/` (IDE + CLI now read the same file there); the
+	## old path is left in `detect_paths` below so an existing install is
+	## still recognized, but new/updated entries write to the current path.
 	path_template = {
-		"unix": "~/.gemini/antigravity/mcp_config.json",
-		"windows": "$USERPROFILE/.gemini/antigravity/mcp_config.json",
+		"unix": "~/.gemini/config/mcp_config.json",
+		"windows": "$USERPROFILE/.gemini/config/mcp_config.json",
 	}
 	server_key_path = PackedStringArray(["mcpServers"])
 	entry_url_field = "serverUrl"
 	## `disabled` is user-state (they may have flipped the entry off in the
 	## UI); seeded on first Configure but preserved across reconfigure.
 	entry_initial_fields = {"disabled": false}
-	detect_paths = PackedStringArray(path_template.values())
+	detect_paths = PackedStringArray(path_template.values() + [
+		"~/.gemini/antigravity/mcp_config.json",
+		"$USERPROFILE/.gemini/antigravity/mcp_config.json",
+	])