chore: add a changeset for the build memory work

Assisted-by: Claude Opus 5.5 <noreply@anthropic.com>
Co-authored-by: Aviv Keller <me@aviv.sh>

Author: ovflowd

.changeset/build-memory.md

@@ -0,0 +1,7 @@
+---
+'@doc-kit/core': minor
+'@doc-kit/generator-react': minor
+'@node-core/doc-kit-legacy': minor
+---
+
+Builds take about half the memory and a third of the time (measured on the Node.js API docs): Shiki registers each language once code in it is highlighted, highlighted code reaches pages as static markup rather than a tree per token, `all.html` is rendered by the worker pool, HTML is no longer minified (serve it compressed instead), idle workers end after 250ms, and each worker's heap is limited to 512MB, which Node.js's `--max-old-space-size` raises. `@doc-kit/core/utils/html-minifier.mjs` is removed.