fix(cli): lazy settings fetch and full device erase

Download settings only for --show or when applying edits; skip upload
when unchanged; erase entire device root including settings.json.

Co-authored-by: Cursor <cursoragent@cursor.com>

device.py

@@ -137,7 +137,8 @@ class DeviceConnection:
             dirs_created = 0
             
             for root, dirs, files in os.walk(local_dir):
-                # Calculate relative path from local_dir
+                # Never upload Python bytecode trees (MicroPython does not use them).
+                dirs[:] = [d for d in dirs if d != "__pycache__"]
                 rel_path = os.path.relpath(root, local_dir)
                 
                 # Build remote path
@@ -156,8 +157,10 @@ class DeviceConnection:
                     self.transport.fs_mkdir(remote_base)
                     dirs_created += 1
                 
-                # Copy files
+                # Copy files (skip bytecode; __pycache__ dirs are pruned above)
                 for file in files:
+                    if file.endswith((".pyc", ".pyo")):
+                        continue
                     local_file = os.path.join(root, file)
                     # Handle root directory case properly
                     if remote_base == '/':