Add notes that sample-platform depends on artifact names

The CCExtractor/sample-platform test runner does exact string matching
on artifact names to find builds for testing. If these names are changed
without updating Artifact_names in sample-platform, CI tests silently
stop running.

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

.github/workflows/build_linux.yml

@@ -42,6 +42,9 @@ jobs:
       run: mkdir ./linux/artifacts
     - name: Copy release artifact
       run: cp ./linux/ccextractor ./linux/artifacts/
+    # NOTE: The sample-platform test runner (CCExtractor/sample-platform)
+    # matches artifact names exactly. Update Artifact_names in
+    # mod_ci/controllers.py there if you rename this artifact.
     - uses: actions/upload-artifact@v6
       with:
         name: CCExtractor Linux build

.github/workflows/build_windows.yml

@@ -129,6 +129,9 @@ jobs:
         run: ./ccextractorwinfull.exe --version
         working-directory: ./windows/${{ matrix.outdir }}Release-Full
 
+      # NOTE: The sample-platform test runner (CCExtractor/sample-platform)
+      # matches artifact names exactly. Update Artifact_names in
+      # mod_ci/controllers.py there if you rename these artifacts.
       - name: Upload Release artifact
         uses: actions/upload-artifact@v6
         with: