Initial reusable pipeline (ci, security-scan, ai-review)

README.md

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+# vanity-dev-engine
+
+Shared CI/Security/AI reusable workflows for Vanity ecosystem repositories.
+
+## Reusable Workflow
+
+Use from another repository:
+
+```yaml
+jobs:
+  use-vanity-dev-engine:
+    uses: OliverGiertz/vanity-dev-engine/.github/workflows/repo-pipeline.yml@v1
+    secrets: inherit
+```
+
+Optional inputs:
+
+- `lint_command`
+- `build_command`
+- `test_command`
+
+Optional control:
+
+- set repository variable `USE_VANITY_DEV_ENGINE=true` in consumer repos.