Hammer createTokenizer with the worst stalls a terminal can produce —
split + flush at every interior byte, and a 200-report byte-by-byte feed
that flushes after every single byte — and assert the two invariants that
make the SGR-leak class structurally impossible: nothing ever leaks as a
text token, and every complete report reassembles whole. A mixed
mouse+keystroke variant proves real input survives the same storm.
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