CR: harden discovery callback during full scan #2620

Job	Run time
Dependency	4s
Shellcheck	4s
Cache identify	6s
Prepare	8s
Ruff check and force	12s
Check commit	30s
Run pytest using Python 3.13	30s
Process test coverage	12s
Run mypy	0s
Process test complexity	9s
Build and publish Python 🐍 distributions 📦 to TestPyPI	10s
	2m 5s

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