pylint cleanups

bin/inject_nanopb_options.py

@@ -21,7 +21,7 @@ generated by regen-protobufs.sh, not the source .proto files.
 import re
 import sys
 from pathlib import Path
-from typing import Any, Dict, List, Optional, Tuple
+from typing import Any, Dict, List, Tuple
 
 # IntSize enum values from nanopb.proto
 INT_SIZE_ENUM = {8: "IS_8", 16: "IS_16", 32: "IS_32", 64: "IS_64"}
@@ -72,7 +72,7 @@ def parse_options_file(
     specific: Dict[Tuple[str, ...], Dict[str, Any]] = {}
     wildcard: Dict[str, Dict[str, Any]] = {}
 
-    with open(path) as f:
+    with open(path, encoding="utf-8") as f:
         for line in f:
             # Strip inline comments
             comment_pos = line.find("#")
@@ -287,6 +287,7 @@ def inject_into_proto(
 
 
 def main() -> int:
+    """Parse an .options file and inject its constraints into a .proto file in-place."""
     if len(sys.argv) != 3:
         print(
             f"Usage: {sys.argv[0]} <options_file> <proto_file>",
@@ -312,13 +313,13 @@ def main() -> int:
         print(f"  [{opts_path.name}] No injectable options found, skipping.")
         return 0
 
-    content = proto_path.read_text()
+    content = proto_path.read_text(encoding="utf-8")
 
     # After regen-protobufs.sh's sed fixup, the nanopb import path is:
     nanopb_import_path = "meshtastic/protobuf/nanopb.proto"
 
     modified = inject_into_proto(content, specific, wildcard, nanopb_import_path)
-    proto_path.write_text(modified)
+    proto_path.write_text(modified, encoding="utf-8")
 
     print(
         f"  [{opts_path.name}] Injected {len(specific)} specific + "