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-implementation/assets/implementation-checklist.md

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+# SEO Implementation Checklist
+
+Before changing code, confirm the current project has or needs:
+
+- Metadata generation by page type.
+- Canonical tags and noindex controls.
+- XML sitemap generation.
+- robots.txt policy.
+- Open Graph and social metadata.
+- Structured data by page type.
+- Breadcrumb markup and UI breadcrumbs.
+- Internal linking modules.
+- Category intro content or SEO content blocks.
+- Product content sections such as FAQs, specs, care, compatibility, or shipping info.
+- Search result and filter route indexation rules.
+- Pagination or infinite-scroll SEO handling.
+- Image component support for alt text, size hints, and optimized delivery.
+- Performance-sensitive rendering for money pages.
+
+If any item is missing, decide whether to implement it now, defer it, or document it as blocked by architecture.