Revert "merge: tier2/phase2_4_5_call_site_completion_20260621 (parent + follow-up + Phase 6e analysis)"

This reverts commit f914b2bcd4, reversing
changes made to 7fef95cc87.

src/api_hooks.py

@@ -10,17 +10,9 @@ import uuid
 # TODO(Ed): Eliminate these?
 from http.server import ThreadingHTTPServer, BaseHTTPRequestHandler
 from typing      import Any
-from dataclasses import dataclass
 
 from src.module_loader import _require_warmed
 from src.result_types import ErrorInfo, ErrorKind, Result
-from src.type_aliases import JsonValue
-
-
-@dataclass(frozen=True)
-class WebSocketMessage:
- channel: str
- payload: JsonValue
 
 
 """
@@ -139,7 +131,7 @@ class HookServerInstance(ThreadingHTTPServer):
   super().__init__(server_address, RequestHandlerClass)
   self.app = app
 
-def _serialize_for_api(obj: Any) -> JsonValue:
+def _serialize_for_api(obj: Any) -> Any:
  """Serializes complex objects into API-friendly formats (dicts/lists)."""
  if hasattr(obj, "to_dict"):
   return obj.to_dict()
@@ -980,12 +972,12 @@ class WebSocketServer:
   if self.thread:
    self.thread.join(timeout=2.0)
 
- def broadcast(self, message: WebSocketMessage) -> None:
+ def broadcast(self, channel: str, payload: dict[str, Any]) -> None:
   """
     [C: src/app_controller.py:AppController._process_pending_gui_tasks, src/events.py:AsyncEventQueue.put, tests/test_websocket_server.py:test_websocket_subscription_and_broadcast]
   """
-  if not self.loop or message.channel not in self.clients:
+  if not self.loop or channel not in self.clients:
    return
-  wire = json.dumps({"channel": message.channel, "payload": message.payload})
-  for ws in list(self.clients[message.channel]):
-   asyncio.run_coroutine_threadsafe(ws.send(wire), self.loop)
+  message = json.dumps({"channel": channel, "payload": payload})
+  for ws in list(self.clients[channel]):
+   asyncio.run_coroutine_threadsafe(ws.send(message), self.loop)