0.3.3 swept 83 lexicon patterns arm by arm and left the other ten regex-bearing
modules on 0.3.2's hand-written rows. Generalising the sweep found three more,
and the two on the input path matter more than the count suggests: `sanitize` is
step 1 of `prepare_input`, and `MAX_SCAN_CHARS` is applied in `scan_lexicon` and
`scan_output` only, so there was no cap to extrapolate to. That missing input
cap is now a documented residual of its own -- extending it changes the contract
for existing callers and is not something to smuggle into a ReDoS patch.
Version synced in all four places + CHANGELOG. LIMITATIONS 30 -> 31 items;
the 0.3.3 entry claiming the lexicon sweep's scope is corrected in place, since
"the output path" was never the whole surface either.
676 tests, coverage 128/128 + 6/6 gaps, sweep clean across 150 patterns.