Ensure connector always passes meta placeholder

Pass `_meta=None` through connector call_tool even when no trace is set and keep FastMCP cast typed.

Author: ryantzr1

hud/clients/fastmcp.py

@@ -148,7 +148,7 @@ async def _call_tool(self, tool_call: MCPToolCall) -> MCPToolResult:
             meta = {"_hud_trace_id": trace_id}
 
         # FastMCP returns a different result type, convert it
-        client = cast(Any, self._client)
+        client = cast("Any", self._client)
         # Only pass _meta if we have trace context to avoid test/API issues
         if meta:
             try:

hud/environment/connection.py

@@ -198,17 +198,13 @@ async def call_tool(
 
         args = dict(arguments or {})
         trace_id = get_current_trace_id()
+        meta = {"_hud_trace_id": trace_id} if trace_id else None
 
         client = cast("Any", self.client)
-        # Only pass _meta if we have trace context
-        if trace_id:
-            meta = {"_hud_trace_id": trace_id}
-            try:
-                result = await client.call_tool(name=name, arguments=args, _meta=meta)
-            except TypeError:
-                # Fallback for clients that don't accept _meta
-                result = await client.call_tool(name=name, arguments=args)
-        else:
+        try:
+            result = await client.call_tool(name=name, arguments=args, _meta=meta)
+        except TypeError:
+            # Fallback for clients that don't accept _meta
             result = await client.call_tool(name=name, arguments=args)
 
         # FastMCP and mcp-python use slightly different result shapes/types.