fix(cli): preserve autoscaling validation diagnostics

[cursor]

Summary

• replace bare autoscaling validation exits with CliDiagnosticExit
• retain existing detailed console errors while emitting stable, privacy-safe telemetry diagnostics
• add an end-to-end regression test for invalid beta endpoint autoscaling bounds

This addresses current-version beta endpoints update failures that supplied replica bounds, made no API requests, and were recorded only as error 1.

Tests

• TOGETHER_TELEMETRY_DISABLED=1 uv run pytest tests/cli/test_command_telemetry.py tests/cli/test_build_autoscaling.py -n 0
• env -u TOGETHER_PROJECT_ID TOGETHER_TELEMETRY_DISABLED=1 uv run pytest tests/cli/test_beta_endpoints_update.py tests/cli/test_beta_endpoints.py -n 0
• ./scripts/lint

  

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