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/SKILL.md

@@ -0,0 +1,26 @@
+---
+name: ecommerce-store-foundation
+description: 'Create a new ecommerce project with FastAPI, React, Next.js, PostgreSQL, storefront, admin panel, back office, and AGENTS.md. Use for greenfield online stores in monorepos or split repos.'
+argument-hint: 'Describe the store, repo mode, design direction, and must-have features'
+---
+# Ecommerce Store Foundation
+
+## When to use
+- Building a new online store from scratch.
+- Scaffolding a new FastAPI and React commerce stack.
+- Setting up storefront plus admin panel or back office.
+- Creating AGENTS.md before implementation.
+
+## Procedure
+1. Run the discovery questions from [discovery checklist](./assets/discovery-checklist.md).
+2. Decide whether the target is a monorepo or split repos.
+3. Create AGENTS.md first using the matching template.
+4. Define entities, flows, roles, and integrations.
+5. Scaffold backend, then storefront, then admin.
+6. Finish with responsive polish, motion, content plan, and image prompt support.
+
+## Templates
+- Monorepo: [monorepo AGENTS template](./assets/monorepo-agents-template.md)
+- Split frontend repo: [split frontend AGENTS template](./assets/split-frontend-agents-template.md)
+- Split backend repo: [split backend AGENTS template](./assets/split-backend-agents-template.md)
+- Image prompts: [image prompt template](./assets/image-prompt-template.md)