fix(cli): preserve endpoint creation diagnostics

[cursor]

Summary

• replace endpoint creation's controlled sys.exit(1) paths with CliDiagnosticExit
• retain safe categorical diagnostics for replica bounds, availability zones, hardware, and unavailable models
• keep the existing user-visible guidance unchanged
• add focused regression coverage for every converted path

Evidence

The 2026-08-22 14:00–2026-08-23 14:00 UTC export contained 175 CLI failures, 18 from version 2.31.0. Two current-version legacy endpoints create invocations were recorded only as 1; one omitted hardware and followed the command's existing guided failure path. #537 covers only the shared endpoint API decorator, so it does not duplicate these command-specific exits.

Tests

• TOGETHER_TELEMETRY_DISABLED=1 python3 -m uv run pytest tests/unit/test_cli_endpoint_create.py tests/unit/test_cli_telemetry.py tests/cli/test_endpoints.py (57 passed)
• focused endpoint diagnostic suite (5 passed)
• Ruff check and format check
• Pyright on changed files
• mypy on the implementation

  

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