v0.21.0

Added

• Tier 1 & 2 parser optimizations: pre-sized arena allocators and parallel user stub discovery for improved cold-start performance (25-40% improvement expected).

Fixed

• cargo-deny configuration format corrected to use proper advisories section syntax.
• Security audit findings: eliminated unwrap calls and unsafe UTF-8 conversions.
• Panic on empty generic type parameters in docblock parsing.
• Outdated lock poison .expect() calls replaced with proper error handling.
• Template parameter bounds preservation and improved generic type narrowing.
• MixedClone detection for unconstrained template parameters.
• Missing stubs directory safety check in build.rs.
• Soft stub fallback version-gating for both functions and classes.

Changed

• Refactored AST-based stub discovery in FileAnalyzer for clarity and performance.
• Split db.rs into focused sub-modules for maintainability.
• Improved code quality with centralized test utilities.
• Eliminated HashMap/HashSet clones in cache flush hot paths.
• Reduced string clone allocations in hot paths.
• Replaced std::sync::Mutex with parking_lot::Mutex to eliminate poison panics.

Performance

• Parallelized fixture discovery in build script.