refactor: remove wait_seconds from get_user_request tool

Wait time is now fully server-controlled via default_wait_seconds setting.
Agents can no longer request a different wait duration - only the user
controls this via the web UI.
- Remove wait_seconds param from get_user_request signature
- Simplify actual_wait to min(cfg.default_wait_seconds, MAX_WAIT)
- Update Settings panel label from 'Min Wait' to 'Wait (sec)'
- Update hint text to explain server-only control
- Update README: input schema, behavior rules, settings description, changelog

app/mcp_server.py

@@ -42,21 +42,16 @@ _agent_generations: dict[str, int] = {}
 @mcp.tool()
 async def get_user_request(
     agent_id: str = "unknown",
-    wait_seconds: Optional[int] = None,
     default_response_override: Optional[str] = None,
 ) -> dict:
     """
     Fetch the next pending user instruction from the queue.
 
-    The server enforces a minimum wait time (configurable via the web UI).
-    The agent may request a longer wait via `wait_seconds`, but cannot go
-    below that minimum — this prevents busy-polling when the queue is empty.
-    actual_wait = max(wait_seconds or 0, server_min_wait_seconds).
+    If no instruction is available the tool will wait up to `wait_seconds`
+    (or the server-configured default) before returning an empty / default response.
 
     Args:
         agent_id: An identifier for this agent instance (used to track connectivity).
-        wait_seconds: Desired wait when queue is empty. Actual wait is
-                      max(this, server minimum). Omit to use server minimum only.
         default_response_override: Override the server-default empty response text
                                    for this single call.
 
@@ -66,12 +61,8 @@ async def get_user_request(
     """
     cfg = config_service.get_config()
 
-    # default_wait_seconds is the server-enforced MINIMUM wait time.
-    client_requested = wait_seconds if wait_seconds is not None else 0
-    actual_wait = min(
-        max(client_requested, cfg.default_wait_seconds),  # enforce floor
-        _MAX_WAIT_SECONDS,
-    )
+    # Wait time is entirely server-controlled — the user sets it via the web UI.
+    actual_wait = min(cfg.default_wait_seconds, _MAX_WAIT_SECONDS)
 
     # Register this call as the newest for this agent.  Any older coroutines
     # still lingering (e.g. client timed-out and retried) will see a stale