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* XFA: one script thread per event, and the live form kept up to date in place A form with hundreds of calculate scripts used to spend its open-time budget on set-up: every script got a thread of its own, and the engine dropped its live form after every value a script settled, rebuilding the whole tree for the next script. The js crate gains xfa_session::XfaSession: the scripts of one event run on one thread (with the script stack), each in a fresh JavaScript context or FormCalc interpreter on a copy of the form as the engine holds it then, so scripts share nothing, a script that fails halfway leaves nothing behind, and what a script changed reaches the next one only through the engine. A script past its time limit is abandoned on the thread and the session is dead from then on; a fault in the engine (a panic) loses only that script, the thread is replaced. On wasm the scripts run inline, as before. The engine's runner keeps one session per event and, for a value, now refreshes the one field in its live form in place (xfa::refresh_value, computing the value as the tree builder would: saved values, template defaults) instead of rebuilding the tree; rows, presence, access, resets, relayouts and data rewrites still rebuild it. Under test, the live form is compared with a fresh build before every script and at the end of every event, and a difference ends the test binary (a panic would be caught by the engine's guard and turned into a script error). 210 calculate scripts (one per row of 10 sections x 20 rows, plus a sum per section), debug build, instrumented inside the engine: the script event on open 495 ms -> 204 ms (of which live-form rebuilds 217 ms -> 0), on a change 300 ms -> 172 ms; through the tools, layout included, open 1.27 s -> 0.97 s and a change 0.44 s -> 0.22 s. The rebuild cost removed grew with form size times script count. * CI: the GoToR tests' case lists are only grown on Unix, so Windows must not warn on their mut