GitHub setup succeeds without repository installation guidance #2523

Executor Cloud: GitHub OAuth connection succeeds, but private repository calls return 404 until Executor.sh's GitHub App is installed separately.

Verified with the same Executor account and repository:

• Before installation: identity lookup succeeds, GET /user/installations returns 0, and the private repository read returns 404.
• After installation: installation count is 1 and the same repository read succeeds. No credential replacement was needed.

The catalog health check only calls GET /user. Its README describes one-click sign-in without explaining repository installation.

Please include an installation link and repository-selection guidance, and distinguish identity verification from repository access. Public-only connections can remain valid. scopes: [] is correct for GitHub App authentication.

Related: #2080 implemented this setup step but was closed unmerged; the closing comment invited a new v2 report. This supplies a current hosted reproduction. Deployed server version unknown. No private identifiers or credentials included.