Add test coverage checklist, report template, and stack matrix for ecommerce project

- Created a test coverage checklist to ensure comprehensive testing of backend and frontend components.
- Added a test report template to standardize reporting on test execution results and gaps.
- Introduced a test stack matrix to guide the selection of testing tools and frameworks for backend and frontend.
- Established a skill for repairing failing tests, including a failure triage checklist and a test repair template.
- Documented recommended MCP stack for ecommerce development with FastAPI and React/Next.js.
- Developed a detailed README outlining the project structure, agent capabilities, and recommended workflows.
- Compiled a comprehensive workflow guide detailing step-by-step commands for project setup, testing, and SEO implementation.

site-fullstack/.github/skills/ecommerce-seo-review/assets/seo-review-template.md

@@ -0,0 +1,53 @@
+# SEO-REVIEW.md Template
+
+## 1. Review Scope
+- Reviewed area
+- Inputs used: .ai/SEO-PLAN.md, .ai/STORE-BRIEF.md, AGENTS.md, codebase files
+- Limits of the review
+
+## 2. Executive Summary
+- Overall SEO implementation quality
+- Biggest risks
+- Biggest missed opportunities
+
+## 3. Findings
+
+### Critical
+- List critical findings
+
+### High
+- List high-priority findings
+
+### Medium
+- List medium-priority findings
+
+### Low
+- List low-priority findings
+
+## 4. Page-Type Notes
+- Homepage
+- Categories and collections
+- Product pages
+- Brand pages
+- Editorial or support pages
+- Utility pages
+
+## 5. Technical SEO Notes
+- Metadata system
+- Canonicals and noindex
+- Sitemap and robots
+- Structured data
+- Internal linking
+- Performance-sensitive SEO
+
+## 6. Unknowns and Runtime Validation
+- Items that require browser validation
+- Items that require production or Search Console data
+
+## 7. Remediation Plan
+- Quick wins
+- Medium lifts
+- Structural fixes
+
+## 8. Suggested Next Validation Steps
+- What to test after fixes are applied