memory@0.20.1

Publish @ai-devkit/memory 0.20.1 — patch: no functional changes since 0.20.0; the only unreleased commits touching this package are tooling chores (fc09960 repo-wide oxfmt source reformat, 6c51ae5 oxlint migration removing eslint config), hence patch. Released to keep the registry tarball in parity with main; consumer pins (cli, memory-dashboard) re-pinned to 0.20.1 in the same commit per the workspace-pin rule.