refactor: remove cross-repo contract tests from devx

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

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Co-Authored-By: Devin <158243242+devin-ai-integration[bot]@users.noreply.github.com>

docs/specs/DEVX-160.md

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+# DEVX-160: Remove cross-repo contract tests from devx
+
+## Problem
+devx unit tests (`test_spec_driven_workflows.py`) were validating workflow
+YAML and skill files in infra, grm, sso-bridge, and Mattermost OIDC repos.
+This is an architecture violation — devx must not be aware of other repos.
+Those repos consume devx; devx does not test them.
+
+## Approach
+Rewrite `test_spec_driven_workflows.py` to only test devx's own workflows
+and skills. Remove all references to `_OBLACHNO_ROOT`, `_INFRA`, `_GRM`,
+`_SSO_BRIDGE`, and parametrized repo lists.
+
+REQ-1: No references to other repos in devx tests
+REQ-2: All devx workflow/skill tests still pass
+REQ-3: 100% coverage maintained
+
+## Test Plan
+- Run `pytest tests/unit/test_spec_driven_workflows.py` — all pass
+- Run full test suite with coverage — 100%
+
+## Deploy Plan
+- Merge to master
+
+## Rollback Plan
+- Revert the merge commit
+
+## Acceptance Criteria
+- [x] REQ-1: No references to other repos in devx tests
+- [x] REQ-2: All devx workflow/skill tests still pass
+- [x] REQ-3: 100% coverage maintained