fix(campus-net): prompt for a usable interface

[Cedarflake]

Summary

• Share Windows IPv4 interface enumeration between the CLI and GUI
• Prompt interactive CLI users to explicitly select another interface when probing is inconclusive
• Keep the selection runtime-only and create a fresh bound session without changing config.json
• Preserve fail-fast behavior for GUI, background, redirected, cancelled, and non-interactive runs
• Document the recovery flow and packaged CLI smoke check

Root cause

The captive runner converted an UNKNOWN probe result directly into exit code 2. The GUI could enumerate and select interfaces, but the CLI had no explicit recovery path, so a stale or disconnected configured interface always stopped the run.

Validation

• python -m unittest discover -s tests -p "test_*.py" -v — 164 tests passed
• uvx ruff format --check workbench — 97 files formatted
• uvx ruff check workbench — passed
• python -m PyInstaller --clean --noconfirm build.spec — passed
• Packaged Auto-Connect-CampusNet.exe --help and --print-config-path — exit code 0
• Live read-only Windows IPv4 enumeration — succeeded

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