fix(cli): preserve empty failure diagnostics

[cursor]

Summary

• fall back to an exception's class name when its sanitized CLI error message is empty
• keep failure telemetry categorical and privacy-safe instead of allowing the error property to disappear
• cover generic and Cyclopts exceptions with empty diagnostics

Tests

• TOGETHER_TELEMETRY_DISABLED=1 .venv/bin/pytest tests/unit/test_cli_telemetry.py tests/cli/test_command_telemetry.py -n 0 (48 passed)
• .venv/bin/ruff check src/together/lib/cli/_track_cli.py tests/unit/test_cli_telemetry.py
• .venv/bin/ruff format --check src/together/lib/cli/_track_cli.py tests/unit/test_cli_telemetry.py
• uv run pyright src/together/lib/cli/_track_cli.py tests/unit/test_cli_telemetry.py

  

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