v0.5.0

Milestone 7 — Hough voting & feature matching in pure Rust

🚀 Features

• (kpm) Implement Hough similarity voting algorithm (M7)
• (kpm) Implement binary hierarchical clustering and k-medoids for FREAK descriptors
• (kpm) Port FeatureStore and FeatureMatcher with three match variants
• (kpm) Port ArrayShuffle for BHC parity with C++ baseline

🐛 Bug Fixes

• (kpm) Fix arlog macro imports and unused variable warnings (#109)
• (kpm) Apply clippy and fmt fixes to hough.rs for M7
• (kpm) Resolve clippy warnings in clustering module
• (kpm) Resolve remaining clippy warnings in clustering
• (kpm) Include in kpm_c_api.cpp for GCC build
• (kpm) Move include before matcher headers for GCC build
• (build) Use platform-appropriate C++ stdlib (libc++ on macOS, libstdc++ on Linux)
• (kpm) Use combined absolute+relative tolerance in M6-2 dual-mode tests
• (kpm) Widen relative tolerance to 1e-5 for M6-2 dual-mode tests

🧪 Testing

• (kpm) Add dual-mode FFI tests for FeatureMatcher (M7-3)
• (kpm) Strengthen dual-mode FeatureMatcher tests with pair equality and global-best invariants

📚 Documentation

• Add pre-commit verification workflow and arlog import pattern to CLAUDE.md

🎨 Styling

• Fix formatting from cargo fmt

⚙️ Miscellaneous Tasks

• Run dual-mode tests in CI to enforce C++ parity
• Scope dual-mode tests to --lib to avoid pre-existing integration test failures