feat(imf): persist verified models in the browser Cache API - #52
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Browsers kept verified bytes in memory only — every page reload redownloaded the whole model. The registry now stores verified zips in a named Cache and re-verifies the sha256 against the index on every use; corrupted entries are deleted and refetched. Node hosts are unchanged (filesystem cache). Download-once per browser.
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The browser tier needs download-once semantics to be usable: the
registry now persists sha256-verified zips in the Cache API
(interscript-imf-models-v1). Every use re-verifies against the index
and refetched. Node path untouched. TDD: stubbed caches + a browser
host simulation (no Node fs) over a local HTTP channel that dies
mid-test to prove the cached copy serves, then corrupts it to prove
refetch. 238 green, tsc/lint clean. Version 4.1.0.