docs: disclose that the ast.unparse rewrite changes the compiled bytecode on 1 of 383 rows (src/00117.py, MBPP task_id 757) — co_code identical on all 383, set remains sound since reference and .pyc come from the same normalised string

fix: co_filename in all 383 .pyc was the build-machine absolute path; now src/NNNNN.py as bench.jsonl declares (oracle fingerprint excludes co_filename; 383/383 preserved)

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