v0.6.0-rc.1

What's Changed

• fix(cc): pre-clean read-only restored objects before recompiling on a cache miss by @emmanuelm41 in #297
• clang-cl support — Layers 0/1/2/4: dialect tables, /EP probe, cacheable cl + Firefox flags (#285) by @emmanuelm41 in #295
• fix(#298): keep restored Rust --test executables executable + regression coverage by @emmanuelm41 in #302
• fix(cc): splice -ffile-prefix-map flags before the -- separator (#300) by @emmanuelm41 in #305
• test(cc): guard #299 — clang-cl invocations get zero injected flags by @emmanuelm41 in #306
• chore(release): bump version to 0.6.0-rc.1 by @emmanuelm41 in #307

Full Changelog: v0.5.1-rc.4...v0.6.0-rc.1