checks: Expand out-of-service detection to fabric ports

[monrog2]

Summary

• include fabric ports in the Out-of-Service Ports validation
• match usage masks 32, 34, 36, and 292
• use explicit equality filters so unrelated usage-mask values are not selected
• update regression fixtures, assertions, and validation documentation

Validation

• git diff --check origin/v4.2.0-dev...HEAD passed
• targeted pytest was not run locally because pytest is unavailable in the current environment

Fixes #292