fix: resolve mypy type errors in pe, baseline, and cli

- Add type arguments to bare dict annotations
- Explicit str() cast for args.rtmr3 to avoid Any return

Author: alhassankhedr-cohere

src/cvm_measure/cli.py

@@ -118,7 +118,7 @@ def _resolve_rtmr3(args: argparse.Namespace, parser: argparse.ArgumentParser) ->
         rtmr3 = extend_rtmr(bytes(SHA384_SIZE), digest)
         return rtmr3.hex()
 
-    return args.rtmr3
+    return str(args.rtmr3) if args.rtmr3 is not None else None
 
 
 def _require_file(path: Path, flag: str) -> None:
@@ -205,7 +205,7 @@ def _cmd_extract_baseline(args: argparse.Namespace) -> None:
         print(f"Baseline written to {args.output}", file=sys.stderr)
     else:
         from dataclasses import asdict
-        data: dict = {}
+        data: dict[str, object] = {}
         if baseline.provider:
             data["provider"] = baseline.provider
         if baseline.platform:

src/cvm_measure/tdx/baseline.py

@@ -108,7 +108,7 @@ def load(path: Path) -> Baseline:
 
 def save(baseline: Baseline, path: Path) -> None:
     """Save a baseline to a JSON file."""
-    data: dict = {}
+    data: dict[str, object] = {}
     if baseline.provider:
         data["provider"] = baseline.provider
     if baseline.platform:

src/cvm_measure/tdx/pe.py

@@ -144,7 +144,7 @@ def pe_extract_section(
     return None
 
 
-def pe_list_sections(pe_data: bytes) -> list[dict]:
+def pe_list_sections(pe_data: bytes) -> list[dict[str, object]]:
     """List all PE sections with metadata."""
     if len(pe_data) < 64 or pe_data[:2] != b"MZ":
         return []