Fix check_hardcoded_byte_size false-positive on inline comments

byte_re was run against the full stripped line, so a comment like
  ! old code: int(8._wp, kind=i64)
would be flagged even though the pattern is inside a Fortran ! comment.
Strip the inline comment portion before searching.

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

Author: sbryngelson

toolchain/mfc/lint_source.py

@@ -142,7 +142,7 @@ def check_hardcoded_byte_size(repo_root: Path) -> list[str]:
             stripped = line.strip()
             if _is_comment_or_blank(stripped):
                 continue
-            if byte_re.search(stripped):
+            if byte_re.search(stripped.split("!")[0]):
                 errors.append(
                     f"  {rel}:{i + 1} hard-codes 8-byte real size."
                     " Fix: use 'storage_size(0._wp)/8' instead of"