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/prompts/ecommerce-seo-strategy.prompt.md

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+name: "Ecommerce SEO Strategy"
+description: "Create or improve an ecommerce SEO strategy across technical SEO, content architecture, schema, metadata, internal linking, and measurement."
+agent: "shop-fullstack-fastapi-react"
+Plan or improve SEO for the ecommerce project.
+
+Requirements for this run:
+- Read .ai/STORE-BRIEF.md first if it exists.
+- If the task is broad, create or update .ai/SEO-PLAN.md.
+- Cover technical SEO, information architecture, category strategy, product page SEO, metadata, schema markup, internal linking, content gaps, and measurement.
+- Do not promise guaranteed first-place rankings; optimize for the strongest realistic organic foundation.