Records the decision the package-registry work turns on — the SDK is built on a
public base and published before the toolchain that consumes it, so nothing is
circular; mesh-tools stays the thin toolchain base but resolves the SDK by
version. Reconciles docs 12/17/22 and indexes the record.
Claude-Session: https://claude.ai/code/session_01D6qtiYU3P9jk3pnAXyAFyx
