Honor Vite's build.write setting

[fallintoplace]

Why

Vite can run a build with build.write disabled to keep generated output in memory. The plugin currently creates dist/.openai from closeBundle anyway, leaving files behind when no build output should be written.

What changed

• Package Sites metadata from writeBundle, which only runs when Vite writes output.
• Add a real Vite build test covering build.write: false.

Test plan

• pnpm check
• git diff --check

[alecbarber-oai]

Thanks!