test(ci): trace detached Windows status writes directly

Author: Sunrisepeak

.github/workflows/cross-build-test.yml

@@ -529,7 +529,6 @@ jobs:
         shell: bash
         run: |
           export MCPP_VENDORED_XLINGS="$XLINGS_BIN"
-          export MCPP_TEST_NATIVE_RENAME=1 # CI-only diagnosis; remove before release
           "$MCPP_SELF" build --target x86_64-linux-musl
           # Scope the search to the TARGET's output tree — target/ also holds the
           # host build from the previous step, and both are named "mcpp*".

src/build/schedule/compiler_transaction.cpp

@@ -52,8 +52,7 @@ bool replace_record(const fs::path& path,std::string_view bytes,std::string* dia
             // CI-only root-cause probe. Remove before merge: it intentionally
             // compares the standard library's rename of this exact source to
             // a distinct diagnostic name, without publishing the status.
-            if(noReplaceCode==static_cast<int>(os::errc::invalid)
-               && std::getenv("MCPP_TEST_NATIVE_RENAME")!=nullptr) {
+            if(noReplaceCode==static_cast<int>(os::errc::invalid)) {
                 const auto sourceLocation=os::fs::locate(temporary);
                 const auto targetLocation=os::fs::locate(path);
                 const auto readable=os::fs::read(temporary);

src/build/schedule/detach_codegen.cppm

@@ -319,7 +319,7 @@ bool write_rc(const std::filesystem::path& slot, int rc,std::string* diagnostic=
 #if defined(_WIN32)
     // CI-only: early supervisor failures have no caller-owned diagnostic.
     // Report their status-publication failure without printing private paths.
-    if(!written&&!diagnostic&&std::getenv("MCPP_TEST_NATIVE_RENAME")!=nullptr)
+    if(!written&&!diagnostic)
         std::println(std::cerr,"mcpp: CI early status publication: {}",localDiagnostic);
 #endif
     return written;