Pull requests now run the macOS x64 test legs and the mas test legs as a
single shard each over a curated allowlist of spec files
(script/macos-x64-spec-allowlist.txt, script/macos-mas-spec-allowlist.txt),
while the darwin arm64 legs keep running the whole suite. The whole suite
still runs on every macOS leg for pushes to main and release branches, for
roller/ pull requests and for pull requests carrying the run-full-macos
label. This takes a PR from 13 macOS runners to 8.
The gate is a new full-macos-tests boolean input on the build-and-test
pipelines and the test segment, computed in build.yml from the event name,
head ref and PR labels, and defaulting to true for every other caller.
Claude-Session: https://claude.ai/code/session_015NrhHJaEg6V3V9G6yF9SHA
Co-authored-by: Claude <noreply@anthropic.com>
