fix(discord_tool): coerce limit parameter to int before min() call

_search_members() and _fetch_messages() call min(limit, 100) assuming
limit is int. Models can pass limit as a string (e.g. "10"), causing
TypeError: '<' not supported between instances of 'str' and 'int'.

Add try/except int() coercion with safe defaults at the top of both
functions, matching the pattern used in session_search fix (#10522).

tools/discord_tool.py

@@ -328,6 +328,10 @@ def _member_info(token: str, guild_id: str, user_id: str, **_kwargs: Any) -> str
 
 def _search_members(token: str, guild_id: str, query: str, limit: int = 20, **_kwargs: Any) -> str:
     """Search for guild members by name."""
+    try:
+        limit = int(limit)
+    except (TypeError, ValueError):
+        limit = 20
     params = {"query": query, "limit": str(min(limit, 100))}
     members = _discord_request("GET", f"/guilds/{guild_id}/members/search", token, params=params)
     result = []
@@ -350,6 +354,10 @@ def _fetch_messages(
     **_kwargs: Any,
 ) -> str:
     """Fetch recent messages from a channel."""
+    try:
+        limit = int(limit)
+    except (TypeError, ValueError):
+        limit = 50
     params: Dict[str, str] = {"limit": str(min(limit, 100))}
     if before:
         params["before"] = before