Add the TypeScript mirror of engine/modules/_constraint_math.py with
identical semantics, validated against the SAME shared corpus
(tests/fixtures/constraint-corpus.json) so Py === TS parity holds. Vitest
covers 2 unit cases (multi-tag multiply, exclude-absorbing) plus the 4
corpus cases (multi-tag->1, multi-pick->6, exclude->EXCLUDE, exception->0.25).
Also bump bundle TOTAL_LIMIT 405 -> 430 KB for the upcoming SP3 constraint
reach UI; entry/per-file limits unchanged.