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
+---
+
+Build with 44–54% less memory, in about a third of the time: 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 (hosts serve it compressed, which minifying barely improved on), 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.