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-store-foundation/assets/monorepo-agents-template.md

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+# AGENTS.md Template For Monorepo
+
+## Product scope
+- Store type and target audience.
+- Required storefront pages and business flows.
+- Required admin or back office flows.
+
+## Repository structure
+- Root folders, package manager, environments, and local run commands.
+- Frontend and backend ownership boundaries.
+- Shared schema or contract locations.
+
+## Backend rules
+- FastAPI service boundaries.
+- Database stack, migrations, auth, and role model.
+- API naming and validation conventions.
+
+## Frontend rules
+- React framework choice.
+- Routing, layout structure, UI architecture, and data fetching strategy.
+- Responsive, accessibility, and animation expectations.
+
+## Admin rules
+- Admin modules, roles, dashboards, audit-sensitive actions, and content workflows.
+
+## Assets and content
+- Source asset folders, placeholder strategy, and external image prompt workflow.
+
+## Delivery rules
+- Definition of done, testing expectations, and how to handle missing requirements.