`astro build` exits 0 on a vite asset-resolution failure. That is how a
stale `@import` survived the cutover and stayed green through every gate
run: the build printed `[ERROR]`, returned 0, and the gate believed it.
Tee the build log and treat a logged error as a failure. Negative-tested
by reintroducing the import -- GATE 1, with both the vite error and the
new message.
Co-Authored-By: Claude Opus 5 <noreply@anthropic.com>
Marcos Paulo
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