On one dry run the two arm shards split: the shard whose serial tail
held the install-flow suites failed the source-directory policy minutes
after its pre-wave stamp, while its sibling — same runner image, same
stamp — passed with no install-flow suites to notice. Wave suites spawn
Cygwin-family tooling that can rewrite the build directory's DACL
behind the first stamp, so the stamp is now a function invoked both
pre-wave and at the tail boundary, where the deadline-sensitive suites
that depend on it actually run. Both invocations self-verify out loud.
Verified on the VM from a deliberately reset (inherited) build
directory through the real --par path: both stamps report clean, mini
shard green.
Signed-off-by: Martin Vogel <martin.vogel.tech@gmail.com>
Martin Vogel
dc5649d1e6