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Cooldowns were tracked per kind ({move,hint}), so a hint ad and a move ad
did not see each other: after a hinted move's ad the move timer was still
zero, and the next plain move fired an ad immediately — two ads within a
minute, under the cooldown. Track a single shared last-shown time; the kind
only selects the required gap (hint 1m, move 5m, vs_ai 30m) measured from the
last interstitial of any kind. A hint can still fire on its shorter gap
(D30's "independent" hint cooldown), but never stacks a second ad within a
cooldown.
Tests: a hint uses the shorter shared gap; a move does not stack onto a
just-shown hint ad.