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-test-implementation/assets/test-coverage-checklist.md

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+# Test Coverage Checklist
+
+## Backend
+- Auth and permission rules.
+- Catalog reads and writes.
+- Cart behavior.
+- Order creation and lifecycle.
+- Admin operations.
+- Input validation and error responses.
+- Critical business logic and edge cases.
+
+## Frontend
+- Key page rendering.
+- Empty, loading, and error states.
+- User interactions for catalog, cart, checkout, auth, and account.
+- Admin UI interactions when the repo contains admin code.
+
+## High-priority ecommerce flows
+- Add to cart.
+- Quantity updates and cart totals.
+- Checkout or lead flow.
+- Login and protected routes.
+- Admin create or edit flows.
+
+## Review quality
+- Assertions should verify behavior, not just implementation details.
+- Avoid fragile snapshot-heavy suites unless they truly add confidence.