fix(runner): remove dead locale import and harden encoding robustness

- Remove unused `import locale` (dead after encoding fix, fails ruff F401)
- Add `errors="replace"` to both subprocess calls for resilience against
  unexpected non-UTF-8 bytes in JVM error output
- Guard `sys.stdout.buffer` access with hasattr for redirected-stdout
  environments (test fixtures, io.StringIO, etc.)
- Add `sys.stdout.buffer.flush()` to ensure real-time streaming output

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

Author: bundolee

python/opendataloader-pdf/src/opendataloader_pdf/runner.py

@@ -1,7 +1,6 @@
 """
 Low-level JAR runner for opendataloader-pdf.
 """
-import locale
 import subprocess
 import sys
 import importlib.resources as resources
@@ -27,6 +26,7 @@ def run_jar(args: List[str], quiet: bool = False) -> str:
                     text=True,
                     check=True,
                     encoding="utf-8",
+                    errors="replace",
                 )
                 return result.stdout
 
@@ -37,10 +37,15 @@ def run_jar(args: List[str], quiet: bool = False) -> str:
                 stderr=subprocess.STDOUT,
                 text=True,
                 encoding="utf-8",
+                errors="replace",
             ) as process:
                 output_lines: List[str] = []
                 for line in process.stdout:
-                    sys.stdout.buffer.write(line.encode("utf-8", errors="replace"))
+                    if hasattr(sys.stdout, "buffer"):
+                        sys.stdout.buffer.write(line.encode("utf-8", errors="replace"))
+                        sys.stdout.buffer.flush()
+                    else:
+                        sys.stdout.write(line)
                     output_lines.append(line)
 
                 return_code = process.wait()