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devx tests were validating infra, grm, sso-bridge, and Mattermost OIDC workflow/skill files. This is an architecture violation — devx must not be aware of other repos. Those repos consume devx, not the other way round. Tests now only validate devx's own workflows and skills. Closes DEVX-160 Generated with [Devin](https://devin.ai) Co-Authored-By: Devin <158243242+devin-ai-integration[bot]@users.noreply.github.com>