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The composite-mode + project-references setup broke `@/*` path alias resolution inside the Docker stage 1 build (worked locally because tsc's incremental cache was warm). Switch to a single tsconfig with `tsc --noEmit && vite build` — Vite handles the alias via its own resolver, so we only use tsc as a type-checker. Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>