Fix fuzzing implementation - #2
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This commit implements the CI infrastructure for differential fuzzing by updating the Bazel configuration, removing redundant workflows, and properly routing fuzzer execution through the Docker sandbox.
This commit completely rewrites the differential fuzzer natively in C++ to enable coverage tracking and execution speedups. It includes safe subprocess execution via pipe/fork/execv and completely avoids thread-unsafe std::getenv usage. It also adds comprehensive test coverage for edge cases and structural downgrades within the sparse and normal representations, integrating necessary and tightly scoped diagnostic suppressions for known compiler false positives.
This commit updates the README to formalize the completed analysis and verification of the bit-exactness differential fuzzer. It also adjusts the source implementation to reflect these verified constraints.
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