detangle 0.2.1

What's Changed

• Install check for published releases; lock the 0.2.0 platform packages by @debug-diary-1 in #11
• Remove docs/design by @debug-diary-1 in #12
• Resolve imports of unbuilt workspace packages into their sources by @debug-diary-1 in #13
• Unbuilt workspace packages: directory-only root requests; respect preserve_symlinks by @debug-diary-1 in #14
• Release 0.2.1: resolve unbuilt workspace packages by @debug-diary-1 in #15

Full Changelog: v0.2.0...v0.2.1