fix(scrabble): guard initialise() against re-running on repeat calls - #895
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Summary
initialise()wasn't idempotent: a second call re-ran thePromise.all(rebuilding all four Conductor arrays, ~246ms for ~173,000 words) and re-pushed all four exports ontoexportsagain.__initialisedguard (including thesuper.initialise()call), same shape as the csg fix for Migrate CSG Module to Conductor #826, sinceBaseModulePlugin.initialise()isn't idempotent either.Fixes #829
Test plan
yarn tsc --noEmit— no new errorsyarn eslint src/bundles/scrabble/src/index.ts— clean