fix: use sys.platform guards so mypy passes on Windows (#7401)

mypy does not narrow on `platform.system()`, so Windows-based contributors
get 8 spurious attr-defined/unused-ignore errors from the termios and
resource imports. Switch to `sys.platform` comparisons, which mypy
understands natively, and drop the now-unneeded type-ignore comments.

Fixes #7400

Co-authored-by: Vidit Ostwal <110953813+Vidit-Ostwal@users.noreply.github.com>

lib/crewai/src/crewai/memory/storage/lancedb_storage.py

@@ -8,6 +8,7 @@ import json
 import logging
 import os
 from pathlib import Path
+import sys
 import threading
 import time
 from typing import Any
@@ -77,14 +78,15 @@ class LanceDBStorage:
         self._table_name = table_name
         self._db = lancedb.connect(str(self._path))
 
-        try:
-            import resource
+        if sys.platform != "win32":
+            try:
+                import resource
 
-            soft, hard = resource.getrlimit(resource.RLIMIT_NOFILE)
-            if soft < 4096:
-                resource.setrlimit(resource.RLIMIT_NOFILE, (min(hard, 4096), hard))
-        except Exception:  # noqa: S110
-            pass  # Windows or already at the max hard limit — safe to ignore
+                soft, hard = resource.getrlimit(resource.RLIMIT_NOFILE)
+                if soft < 4096:
+                    resource.setrlimit(resource.RLIMIT_NOFILE, (min(hard, 4096), hard))
+            except Exception:  # noqa: S110
+                pass  # Already at the max hard limit — safe to ignore
 
         self._compact_every = compact_every
         self._save_count = 0

lib/crewai/src/crewai/utilities/crew_chat.py

@@ -3,7 +3,6 @@
 import contextvars
 import json
 from pathlib import Path
-import platform
 import re
 import sys
 import threading
@@ -175,11 +174,11 @@ def create_tool_function(crew: Crew, messages: list[LLMMessage]) -> Any:
 
 def flush_input() -> None:
     """Flush any pending input from the user."""
-    if platform.system() == "Windows":
+    if sys.platform == "win32":
         import msvcrt
 
-        while msvcrt.kbhit():  # type: ignore[attr-defined]
-            msvcrt.getch()  # type: ignore[attr-defined]
+        while msvcrt.kbhit():
+            msvcrt.getch()
     else:
         import termios