TEMP: disable CMakeLists.txt from ALWAYS_RUN_ALL to test pruning in CI

This is a temporary commit to verify --only-changes works end-to-end.
Will be reverted before merge.

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

Author: sbryngelson

toolchain/mfc/test/coverage.py

@@ -50,7 +50,7 @@
     "toolchain/mfc/params/definitions.py",
     "toolchain/mfc/run/input.py",
     "toolchain/mfc/case_validator.py",
-    "CMakeLists.txt",
+    # "CMakeLists.txt",  # TEMP: disabled to test pruning in CI — re-enable before merge
 ])