Review finding on #2. Swapping the settle window's `stat -c %Z` for `%Y` —
the exact substitution the comment beside it calls the wrong signal — left
the suite green at 37/37. The scenario built its aside with `mkdir`, so the
fixture's mtime was also ~now and the two timestamps agreed; a fixture whose
clocks agree cannot tell them apart.
Every real aside is the opposite shape: a cache last written days ago,
renamed a moment ago. Under `%Y` the window would never fire for one, the
sweeper would silently return to reclaiming asides another pass is still
deciding about, and nothing would say so — the mechanism guarded by a comment
again, which is what the previous finding was about.
So the fixture is now built the way the pass builds one: an old directory
`mv`d into the aside name. `%Z` -> `%Y` now fails scenario 14, as does
deleting the guard outright.
Also sharpens why the PID alternative was rejected: the `$$` in an aside's
name was that pass's PID inside its own job container, so testing it from
another one is not unreliable, it is meaningless.
No change to prune-cache.sh's behaviour; the assertions are untouched.
claude
dcd73dd82d
