Accept PC-assisted Hardware snapshots during robot discovery

[temiroff]

Outcome

Robot discovery and connected-robot configuration now validate PC-assisted Robot Hardware snapshots by their package module and operational scripts. They no longer require the organized Hardware directory to contain Git metadata. Legacy Hardware migration continues to require a recognized legacy Git checkout.

This fixes the post-install error on managed PC-assisted devices:

The organized Hardware package is missing or invalid

Verification

• Live editor state confirms the Jetson has /home/ubuntu/Blacknode/devices/default/hardware, delivery_mode=pc_assisted, and stack_mode=isolated
• python -m pytest tests/test_editor_devices.py -q — 142 passed
• $env:PYTHONPATH=(Join-Path (Get-Location) 'python'); python -m unittest discover -s tests — 566 passed, 8 skipped
• git diff --check

Managed Runtime release decision

No Runtime release is required. This is editor-server SSH discovery/configuration orchestration behind the existing Find and attach robots action and does not alter the managed Runtime bundle or service contract.