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-strategy/assets/seo-measurement-framework.md

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+# SEO Measurement Framework
+
+## Primary KPIs
+- Non-brand clicks and impressions.
+- Organic sessions by landing page group.
+- Organic conversion rate.
+- Revenue or lead value from organic traffic.
+- Indexed page quality by page type.
+
+## Secondary KPIs
+- CTR on major page templates.
+- Average position for priority keyword groups.
+- Core Web Vitals on category and product pages.
+- Share of traffic landing on strategic commercial pages versus weak informational pages.
+
+## Monitoring dimensions
+- By page type: homepage, category, collection, brand, product, content, help.
+- By market or locale.
+- By device.
+- By branded versus non-branded traffic.
+
+## Reporting approach
+- Separate quick wins from structural improvements.
+- Measure before and after major releases.
+- Track technical fixes, content launches, and internal linking changes as distinct interventions.