Merge pull request #1543 from TSavo/chore/cut-showcase

chore: cut provekit-showcase (demo/benchmark, out of scope)

Author: TSavo

implementations/rust/Cargo.lock

@@ -51,7 +51,6 @@ members = [
     "provekit-lsp-protocol-catalog",
     "provekit-lsp-rust",
     "provekit-build",
-    "provekit-showcase",
     "examples/build_script_demo",
     "provekit-linkerd",
     "provekit-baseline-std",