## Added
- `rand_core` v0.10 support (#333, #513)
- 64-bit counter support (#439)
- `{get,set}_block_pos` inherent methods (#516)
- AVX-512 backend - requires `--cfg chacha20_avx512` to enable (#477)
- Inherent methods for RNG state (de)serialization (#541)

## Changed
- Bump `cipher` from `0.4` to `0.5` - replaces `generic-array` with
  `hybrid-array` (#338, #521)
- Edition changed to 2024 and MSRV bumped to 1.85 (#397)
- Relax MSRV policy and allow MSRV bumps in patch releases
- Bump `cpufeatures` to v0.3 (#530)
- `--cfg chacha20_backend="..."` replaces `chacha20_force*` (#520)
  - `chacha20_force_avx2` => `chacha20_backend="avx2"`
  - `chacha20_force_avx512` => `chacha20_backend="avx512"`
  - `chacha20_force_soft` => `chacha20_backend="soft"`
  - `chacha20_force_sse2` => `chacha20_backend="sse2"`

## Removed
- `chacha20_force_neon` cfg attribute - now on-by-default for supported
  targets (#361)
- `std` feature (#397)
- `Clone` impls (#462)