- pypi wheels against the libczirw-sys submodule (self-contained Eigen build, msvc runtime alignment, bindgen flags) - and slim down publish_pypi.yml: no pinned zig/clang versions, no cmake shim, no bindgen env vars; only the ring /imsvc clang shim remains

Cargo.toml

@@ -23,3 +23,10 @@ debug = true
 
 [profile.dev.package.backtrace]
 opt-level = 3
+
+# Build against the libczirw-sys checkout in the submodule of that name:
+# its fixes (self-contained cmake build via vendored Eigen, msvc C runtime
+# alignment for xwin, bindgen flags for zig's libc++) are not yet published
+# to crates.io; drop this patch once a release containing them is available
+[patch.crates-io]
+libczirw-sys = { path = "libczirw-sys" }