Muhammet Eren Karakuş 606f57a3ab fix(terminal): add Singularity/Apptainer preflight availability check ...

When neither apptainer nor singularity is installed, the Singularity
backend silently defaults to "singularity" and fails with a cryptic
FileNotFoundError inside _start_instance().  Add a preflight check
that resolves the executable and verifies it responds, raising a
clear RuntimeError with install instructions on failure.

Closes #1511

2026-03-16 18:25:20 +03:00

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