compress/zstd accepted for the standard library

The compress/zstd proposal has been accepted, giving Go a standard-library Zstandard implementation to sit alongside the existing gzip and flate packages. It lands the same week as the accepted plan to migrate packages out of x/crypto into the standard library, so the shape of what counts as "batteries included" is visibly shifting. Elsewhere, a golang-nuts thread digs into sync.Pool patterns that actually survive production traffic, which pairs nicely with the zstd news for anyone about to wire a new codec into a hot path.