Ask lib/collab whether a setup error is the server's answer

The generated Convex types stay inside lib/collab
(convex_architecture_test); isConvexFunctionError already says this.

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>
f6ff3e9aefDara Adedeji committed on 10/18/2026, 1:34:44 AMparent9ba9d8f

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