measure: icu with the toolset first on a kept PATH [m3-only]

Author: speak-agent

.github/workflows/measure-734.yml

@@ -29,6 +29,7 @@ env:
 jobs:
   vcpkg-vs:
     name: M1 M2 (Visual Studio)
+    if: "!contains(github.event.head_commit.message, '[m3-only]')"
     runs-on: windows-2025
     timeout-minutes: 90
     defaults: { run: { shell: bash } }
@@ -220,6 +221,11 @@ jobs:
           setenv "$TOOLS"
           run zlib "M3 managed, CMake port" a
           run icu  "M3 managed, make port" a
+          # The make-based port finds link.exe on PATH; vcpkg keeps the caller's PATH
+          # only through VCPKG_KEEP_ENV_VARS.
+          ( export PATH="$TOOLS/bin/Hostx64/x64:$SDK/bin/$SDKVER/x64:/c/Windows/system32:/c/Windows:/c/Windows/System32/Wbem:/c/Windows/System32/WindowsPowerShell/v1.0"
+            export VCPKG_KEEP_ENV_VARS=PATH
+            run icu "M3 managed, make port, toolset first on a kept PATH" k )
           # P3: the same toolset at another path; a restore means the same ABI hash.
           cp -r "$TOOLS" "$RUNNER_TEMP/tc2"
           setenv "$RUNNER_TEMP/tc2"
@@ -232,7 +238,7 @@ jobs:
 
   mcpp-legs:
     name: E2b E4 (mcpp 2026.9.28.2)
-    if: "!contains(github.event.head_commit.message, '[vcpkg-only]')"
+    if: "!contains(github.event.head_commit.message, '[vcpkg-only]') && !contains(github.event.head_commit.message, '[m3-only]')"
     runs-on: windows-2025
     timeout-minutes: 120
     defaults: { run: { shell: bash } }