Addresses all issues found in Codex review:
1. Prevent double-install: Check SUMMARY_PROXY_INSTALLED to distinguish
between fresh installs (skip repair) vs existing installs (run repair)
2. Fix clustered node failures: Explicitly detect deployment type and bail
out with clear error message if neither --ctid nor --standalone can be
determined
3. Add health validation: Mirror main install path - verify service active,
socket exists, and fetch SSH public key after repair
4. Capture installer output: Show full diagnostics on failure (tail -20)
5. Better error messages: Provide specific manual repair commands when
deployment type cannot be auto-detected
This ensures the turnkey repair experience works reliably without regressing
fresh install UX.
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