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`CapsMirrorTest.APlaceholderMirrorConsumesNothing` asserted the defect F1 closes -
"with no snapshot the mask is zero, every family answers no consumer, the client
emits nothing and the legacy pull path runs" - and it was green for five packages
because nothing on the client ever checked whether that pull path exists. It does
not. Four cases replace it, and each one is the control for a different way the
new gate could go wrong:
* `APlaceholderMirrorRefusesToAnswerAndNamesTheFamily` forks, asks a placeholder
mirror about TextureResources with no session anywhere, and requires the death
to carry `Fatal{CapsBeforeFirstSnapshot, "TextureResources"}` AND `0x400` -
R-16's rule, because "something aborted" is satisfied by any of the other 43
family words.
* `ThePlaceholderWaitsForASnapshotAnotherThreadIsFetching` drives the PRODUCTION
bring-up (`MG_Backend::Init`) with `MOBILEGL_TEST_DELAY_FIRST_CAPS_MS=50` and
asks from a second thread. The wait must return the server's real answer, not
the placeholder's false and not a death. It is the only shape in which "block
with a bounded wait" is a correct answer to F1.
* `ARealSnapshotThatWithholdsAFamilyStillAnswersFalse` is what keeps this from
being a callMask defaulted to all-ones: a server that really consumes nothing
is still answered "no", counted and named. Only the PLACEHOLDER is refused.
* `TheReadAccessorsStillAnswerFromThePlaceholder` pins the half of P5's ruling
that F1 does NOT narrow.
`ResetCapsMirrorForTest()` is new and test-only: a fork child inherits whatever the
previous case adopted, so without it a case about the placeholder would be a case
about that snapshot.
`ServerLoopTest`'s main gains no code, only the sentence that explains why it has
none: it sets `MG_Config::Transport` by hand and never runs `MG_ConfigLoader::Init`,
which is exactly what keeps the client-side gate disarmed for a binary that builds
server sessions and the server's own frontend GLContext and never a client at all.