docs(quality): add engineering quality plan

Author: however-yir

docs/ENGINEERING_QUALITY.md

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+# Engineering Quality Plan
+
+This document defines the quality baseline and delivery policy for 
+
+
+default branch in 
+auto-improving workflows.
+
+## 1. Scope
+
+- Repository: 
+auto-tracked via GitHub Actions
+- Primary language: JavaScript
+- Baseline release tag: 
+
+## 2. Quality Gates
+
+- Security scans: CodeQL + secret scanning workflows
+- Dependency hygiene: Dependabot for GitHub Actions and detected ecosystems
+- Contract checks:  in CI
+- Build and test checks: existing project-specific workflows remain the source of truth
+
+## 3. Test Strategy
+
+- Contract layer: repository invariants (docs, security files, workflow presence)
+- Project layer: language/framework tests already configured in existing CI
+- Release layer: tag-based baseline validation for reproducible milestones
+
+## 4. Pull Request Definition of Done
+
+- CI pipelines pass
+- Contract test passes
+- Docs updated for behavior changes
+- Security impact acknowledged for risky changes
+
+## 5. Next Deepening Steps
+
+- Add service-level integration tests for critical user journeys
+- Add performance regression checks on core paths
+- Track flaky tests and enforce deflaking SLA