[split] Refactor / cleanup — from #21

[pull-apart]

Automated split from #21.

Context

This is the refactor / cleanup half of an automated split from #21.

Changes in this PR:

• utilities/unittests/test_console.py: Added import: pytest
• Added helper function _single_attempt_sampler for testing
• Updated test_console_disconnect_terminated_child to mock _proc.poll() and call console_eof_sampler() without arguments
• Updated test_console_eof_sampler_success to assert _spawn_console as func and remove command/timeout checks
• Updated test_console_eof_sampler_no_sample to call console_eof_sampler() without arguments
• Added new test test_spawn_console_success for _spawn_console method
• Added new test test_spawn_console_popen_failure for _spawn_console error handling during Popen call
• Added new test test_spawn_console_fdspawn_failure for _spawn_console error handling during fdspawn call
• Added new test test_terminate_proc_success for _terminate_proc method
• Added new test test_terminate_proc_already_exited for _terminate_proc when process already exited
• Added new test test_terminate_proc_timeout_then_kill for _terminate_proc when process times out
• Added new test test_connect_success_with_reconnect for connect using the new _spawn_console
• Added new test test_connect_failure_with_cleanup for connect error path and _terminate_proc cleanup
• Added new test test_disconnect_success_with_reconnect for disconnect with explicit reconnect

How this split maps your changes

• Refactor branch (split-pr-21-1783491041-refactor): files classified as cleanup / mechanical work:
  • utilities/unittests/test_console.py
• Main branch (split-pr-21-1783491041-main): files classified as feature / behavior work:
  • utilities/console.py

Merge order

Merge the refactor PR first if it touches shared files or would conflict with the main PR; then merge the main PR. Resolve conflicts in the usual way if both branches touch the same lines.

Main PR: #42