Spell out explicitly, per run: check whether the shared index store
already has a published index; if so, fetch it regardless of access
level; a write-access user always continues to rebuild and publish
back to that same store, and this is precisely what creates it there
the first time the store is empty. A read-only user never rebuilds or
publishes anything, whether or not the store already had content.
Co-Authored-By: Claude Sonnet 5 <noreply@anthropic.com>
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