feat: reword phase to epic, update mkdocs

docs/content/stories/epic7/7.3-cicd-enhancement.md

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+# Story 7.3: CI/CD Pipeline Enhancement
+
+## Metadata
+- **Story ID**: 7.3
+- **Title**: CI/CD Pipeline Enhancement
+- **Epic**: 7 - Testing, Documentation & CI/CD
+- **Status**: Pending
+- **Priority**: High
+- **Estimated Time**: 5-6 hours
+- **Dependencies**: 7.1
+
+## Goal
+Enhance CI/CD pipeline with comprehensive testing, security scanning, and release automation.
+
+## Description
+This story enhances the CI/CD pipeline to run comprehensive tests, perform security scanning, and automate releases with Docker image builds.
+
+## Deliverables
+
+### 1. Enhanced CI Pipeline
+- Update `.github/workflows/ci.yml`:
+  - Run unit tests with coverage
+  - Run integration tests (with testcontainers)
+  - Run linters (golangci-lint, gosec)
+  - Generate coverage report
+  - Upload artifacts
+
+### 2. Release Workflow
+- Add release workflow:
+  - Semantic versioning
+  - Tag releases
+  - Build and push Docker images
+  - Generate changelog
+
+### 3. Security Scanning
+- `gosec` for security issues
+- Dependabot for dependency updates
+- Trivy for container scanning
+
+## Acceptance Criteria
+- [ ] CI pipeline runs all tests
+- [ ] Coverage reports are generated
+- [ ] Security scanning works
+- [ ] Release workflow works
+- [ ] Docker images are built and pushed
+
+## Files to Create/Modify
+- `.github/workflows/ci.yml` - Enhanced CI
+- `.github/workflows/release.yml` - Release workflow
+- `.github/dependabot.yml` - Dependabot config
+