ClientTLS was the most security-sensitive package in the tree and the least
covered, and it was not in the coverage gate at all (the gate's 4-package set
predates it). 48 -> 84 tests against the real macOS keychain, serialized with a
custom Testing trait after a @globalActor proved insufficient (actors yield at
await, so cross-await critical sections got interleaved by other cases' cleanup).
CI: the app/ipad/ios17 legs ran a bundle containing LiveServerSmokeTests, which
spawns tsx, with no npm ci -- a hard failure, not a skip, on a bare checkout.
Adds the missing iPad UI-test leg, and makes a missing iOS 17 runtime fail loudly
instead of silently reporting green.
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