Task 1: IncrementalMicrostructureCalculator (12 new features, O(1)/tick) Task 2: fxcache OFI_DIM 8→20 atomic update (15 files, 30+ locations) Task 3: Extend precompute pipeline with MicrostructureState Task 4: Regenerate fxcache + smoke test + compute-sanitizer Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>