v2.0 - Cold-Gated Re-ranking & Benchmarks

What's Changed

Features & Core Improvements

• Cold-Gated Re-ranking: Fixed hot-item stability issues from v1. The neural network now strictly scores cold items (count == 0), preserving MTF order for hot items in #4 @Elitsuv
• Noise Guard (min_evidence): Added access threshold gating to prevent singleton queries from causing cache thrashing in #4 @Elitsuv
• Benchmark Suite: Added 8.1M multi-regime benchmark suite testing stationary Zipf, workload drift, and noise degradation in #4 @Elitsuv
• Test Suite: Added 16 unit tests with 100% pass rate covering lookups, invariants, and edge cases in #4 @Elitsuv

Documentation

• README Overhaul: Added verified benchmark score tables, architecture overview, and test badges in #5 & #6
  @Elitsuv

Full Changelog: v0.1.1...v2.0