Feat/token quirks engine#60
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Five heuristic detectors for non-standard ERC20 integration bugs: - token-fee-on-transfer: transferFrom amount used without balance diff - token-rebasing-incompatible: cached balanceOf without shares conversion - token-erc777-reentrancy: transfer without guard + post-call state write - token-unchecked-return: raw transfer/approve without return check - token-approval-race: approve without zero-first pattern Includes 14 unit tests covering detection and skip paths. Refs #56
Run token quirks stage after guard_engine, before cross_contract. Add token_candidates to PipelineStats and CachedEngineResult. Bump ENGINE_CACHE_VERSION v5 → v6. Refs #56
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