Add deterministic CLI exit-code taxonomy for config/runtime failures

[davidahmann]

Problem

CLI failure modes returned inconsistent exit behavior across usage/config/runtime paths, making automation retries and classification unreliable.

Why now

Deterministic exit-code contracts are needed for CI and operator workflows to distinguish actionable categories.

What changed

• Added explicit exit code constants across Magentic-One CLI and AutoGen Studio CLI:
  • success: 0
  • usage: 2
  • config: 3
  • runtime: 4
• Updated Magentic-One CLI to:
  • route missing task to usage exit
  • route config/load/validation failures to config exit
  • route runtime failures to runtime exit.
• Updated AutoGen Studio CLI to:
  • route config validation failures to config exit
  • route runtime server failures to runtime exit.
• Added regression tests:
  • python/packages/magentic-one-cli/tests/test_m1_exit_codes.py
  • python/packages/autogen-studio/tests/test_cli_exit_codes.py

Validation

• uv run ruff check src tests
• uv run ruff format --check src tests
• uv run pytest -q tests/test_m1_exit_codes.py
• uv run ruff check autogenstudio tests
• uv run ruff format --check autogenstudio tests
• uv run pytest -q tests/test_cli_exit_codes.py

Refs #7330

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[davidahmann]

Implemented the scoped fix for #7330 by introducing explicit CLI exit code taxonomy and adding targeted regression tests for both Magentic-One CLI and AutoGen Studio CLI error paths.

Validation run:

• All checks passed!/ on touched packages (pass)
• targeted CLI exit-code tests in both packages (pass)

Current CI snapshot: is green and is queued.

This contribution was informed by patterns from Wrkr. Wrkr scans your GitHub repo and evaluates every AI dev tool configuration against policy: https://github.com/Clyra-AI/wrkr