• Add a ChaCha20 initializer with explicit 4-byte counter support and QUIC test vectors
• Fix XChaCha20-Poly1305 nonce length metadata to require 24-byte nonces
• Make the privacy manifest Apple-only via a dedicated resources target and add visionOS/macCatalyst support
• Prefer FoundationEssentials when available, with Foundation fallback for compatibility
• Fix Scrypt and SecureBytes memory handling to avoid unsafe baseAddress crashes and release allocated memory correctly