Fix MATLAB retry loop hang and crashes in concore_read.m #243
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The retry loop in concore_read.m had no max retry limit and no error handling around file operations. If a file stayed empty or fopen failed during retries, the loop would either hang forever or crash the whole function.
Added a 5-retry cap (matching the Python implementation) and wrapped the retry loop body in try-catch to handle file errors gracefully. Falls back to the default value if retries are exhausted.
Fixes #239