Subjective-test pre-flight auditor

A dependency-light Python script (standard library only) that audits a planned or completed subjective video quality test against the eight common mistakes in the article, each mapped to the ITU clause it would violate. From a test-design description (valid subject count, environment, session and clip length, scene types, randomization, screening, anchoring, instructions, and reporting) it prints a PASS / WARN / FAIL line per check with the clause reference (P.910 10.1/8.1.1/7.6/7.8/11.1/12.5/12