AssMatroskaExtractor and MatroskaLatmSupport reflect MatroskaExtractor's private extractorOutput/subtitleSample fields by name, but no keep rule covered them: R8 renames the fields and every MKV direct-play in a release build fails constructing the extractor. Adds the keepclassmembernames rule (descriptors verified against media3 1.11.0 in the Gradle cache) and extends check_shrinker_rules.py to scan Kotlin/Java reflection across all android src/main roots including libass.
scripts/ had ~80 flat files. Entry points (ci_*.sh, codegen.sh, run_tests.sh, format_native.sh, setup_hooks.sh, upload-symbols.*) and the shared pubspec_version.py stay at the root; checkers, generators, maestro tooling and release tooling move into subdirectories with their tests. Updated every reference: workflow steps, guard-test glob, Docker COPY paths and .dockerignore whitelist, website audit path, dart test imports, and regenerated the five outputs whose headers embed generator paths.
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