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-report-template.md

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+# TEST-REPORT.md Template
+
+## 1. Scope
+- Areas covered
+- Test frameworks used
+- Commands executed
+
+## 2. Added or Updated Tests
+- Backend tests
+- Frontend tests
+- UI or end-to-end tests if any
+
+## 3. Execution Results
+- Passing suites
+- Failing suites
+- Skipped or unrun suites
+
+## 4. Gaps
+- Areas still missing coverage
+- Risky flows still not tested
+
+## 5. Next Step
+- If failures exist, run the test-repair workflow.
+- If green, note whether more coverage is still recommended.