Chris Tate b98d726382 for-of, destructuring, and spread over island values held in 'unknown' drain the engine's own iterator; engine arrays exit into 'any[]' slots ...

- The iteration pack's JSVAL arm is ARMED (scr_dyn_iter_pack, scr_dyn_arr_push_spread, scr_dyn_pack_push_spread_iter route through the new iter_drain ops row): the ENGINE's iterator protocol drains into a fresh DOM array — engine arrays, generators, Maps, Sets, and Symbol.iterator implementations step exactly as Node runs them, elements wrapping back scalar-normalized.
- for-of over checked-dynamic values LOWERS now (both backends): the source packs once through dyn.iterPack and a hidden index loop binds each element as a dyn value (new dyn.arrLen/dyn.arrAt accessors) — an eager snapshot, the matchAll stance. Pattern heads, pre-declared and var heads, and labeled break/continue all ride the desugar. Non-iterables throw V8's for-of CallPrinter spellings, threaded into the engine-side guard.
- The validated exit gains the jsval-element-array arm (scr_jsval_exit_jsval_arr, both backends): an 'any' value exits into 'any[]'- and 'any[] | undefined'-declared slots Array.isArray-gated, elements BY REFERENCE (identity crosses, the spine is a snapshot) — the withPlugins loadPlugins(plugins) boundary, the driver frontier's first named poison.
- Corpus 2604 and npm case jsval-iterate (package-minted Set/Map/generator/Symbol.iterator) are byte-identical to Node under both backends; dyncheck's jsval-iterate pin flips from the retired island fence to the armed answers; SAN clean over the drain/wrap/exit churn.

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..

index.d.ts

for-of, destructuring, and spread over island values held in 'unknown' drain the engine's own iterator; engine arrays exit into 'any[]' slots

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index.js

for-of, destructuring, and spread over island values held in 'unknown' drain the engine's own iterator; engine arrays exit into 'any[]' slots

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package.json

Fixtures for the jsval→DOM crossing: rows 1-3 differential, the fence ladder pinned

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