Root causes identified via logcat:
Chrome <71: globalThis not defined → ReferenceError in Pyodide factory,
loadPyodide stays as {} (set by UMD wrapper), "not a function"
Chrome <63: dynamic import() is a parse-time SyntaxError
Chrome <63: for-await-of is a parse-time SyntaxError
Fix: when Chrome <80 is detected, fetch v0.18.1 pyodide.js as text and apply
three split/join patches before injecting via Blob URL:
1. prepend globalThis polyfill
2. import( → __loadScript( (script-tag shim)
3. for await( → for( (getFsHandles is never called in our flow)
Chrome 80+ keeps the original clean <script>-tag path with v0.26.4.
Davide Scaini
4cabbea0d4