"Failed to find a valid sub check, check your constraints"

# Problem
The following tests are failing with "Failed to find a valid sub check, check your constraints". A skim seems to indicate that all tests with sub_checks are failing.

- 1.1.1.6.a
- 1.1.1.6.b
- 1.1.1.8.a
- 1.1.1.8.b
- 1.1.1.8.c
- 1.1.22
- 1.2.1
- 1.2.2
- 1.3.1
- 1.4.4
- 1.5.4
- 1.6.1.1
- 1.6.2.1
- 1.6.2.2.a
- 1.6.2.2.b
- 1.6.2.3.a
- 1.6.2.3.b
- 1.6.2.4
- 1.6.2.5
- 1.6.3.1
- 1.6.3.2
- 2.1.10
- 2.2.1.1.a
- 2.2.1.1.b
- 2.2.1.2.c
- 2.2.1.2.d
- 2.2.2
- 2.2.3
- 2.2.4
- 2.2.5
- 2.2.6
- 2.2.7.a
- 2.2.7.b
- 2.2.8
- 2.2.9
- 2.2.10
- 2.2.11
- 2.2.12
- 2.2.13
- 2.2.14
- 2.2.16
- 2.2.17
- 2.3.1
- 2.3.2
- 2.3.3
- 2.3.4
- 2.3.5
- 4.2.1.1
- 4.2.1.2

# Platform
NixOS 25.05.20241209.a73246e (Warbler) x86_64
linux-bench built from source at ce03975

Reproduce the listed failing checks using the linux-bench source at ce03975 on NixOS 25.05, then trace how sub_checks are selected and validated. Use the affected check IDs as the test set; done means the listed checks no longer fail with “Failed to find a valid sub check, check your constraints.”

Written by the indexing model from the issue text.