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-visual-pack.prompt.md

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+---
+name: "Ecommerce Visual Pack"
+description: "Produce a visual direction, asset plan, and AI image prompts for an ecommerce storefront and admin experience."
+agent: "shop-fullstack-fastapi-react"
+---
+Prepare the visual system for an ecommerce project.
+
+Requirements for this run:
+- Ask for missing brand and audience information only when necessary.
+- Produce a concise visual direction for storefront and admin.
+- Define typography, color logic, layout rhythm, motion cues, and content block style.
+- List required assets for hero, categories, product placeholders, banners, social preview, and empty states.
+- If real assets are unavailable, generate strong prompts that the user can send to an external image model.