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+- add pyproject.toml
+- declare runtime dependencies
+- add pytest, ruff, mypy and pylint
+- configure src layout
+- keep existing removeads.py behavior unchanged
+refactor: extract H.264 bitstream primitives
+refactor: extract SPS/PPS structures
+refactor: extract AVC decoder configuration
+refactor: extract Matroska/EBML helpers
+refactor: isolate external tool execution
+refactor: separate CLI from processing pipeline