mpg: route attach connection info through the public API - #5191
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Retrieve MPG attach connection information through the public API, falling back to the legacy bundle only on classified cluster or default-credential 404s. Fetch default credentials only when no username is selected. Explicit and interactively selected users use their own credentials without being blocked by an unrelated default-user lookup. Reject failed clusters and missing pooler hosts or ports before requesting credentials. Preserve database and secret-name overrides, legacy fallback behavior, and authoritative non-404 errors. Keep the change scoped to attach and cover public success, credential selection, fallback, readiness, and failure handling.
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fly mpg attachstill fetches the legacy cluster response to get its base connection URI. This change builds that connection information from the public pooler endpoint and default-user credentials instead.Classified 404 responses retain the legacy fallback. Other errors stop before app secrets are written. Missing pooler endpoints are rejected before fetching credentials. The public path uses the existing
fly-userandfly-dbdefaults.Validation: MPG/mpgutil tests, full lint, and build pass. Tests cover public success, fallback and error ordering, missing endpoints, and port defaults. No new end-to-end attach run was performed.