The client bundle aliases `@fusion/core` to the leaf `core/src/types.ts` to
keep Node-only dependencies out of the browser, so a package-root import of
`FUSION_CLIENT_HEADER`/`FUSION_DASHBOARD_UI_CLIENT` typechecked but failed
`vite build`:
"FUSION_CLIENT_HEADER" is not exported by "../core/src/types.ts"
Follow the documented pattern instead of widening the root alias: declare a
`./task-delete-attribution` subpath export, add the matching Vite alias ahead
of the broader `@fusion/core` key (Vite matches in order), register the module
in the browser-safe-core allowlist, and import the subpath from the client.
`task-delete-attribution.ts` has no imports at all, so it is a safe leaf.
`app/utils/detectContentLanguage.ts` already warned about exactly this trap;
the miss was mine for verifying with typecheck, lint and test:gate but not
`pnpm build`, which is one of the four checks CI blocks on.
Co-Authored-By: Claude Opus 5 (1M context) <noreply@anthropic.com>
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