Agent Skills: test-specs-docs

[Testing] Create or update EasyPlatform test specifications in docs/test-specs/{Module}/. Covers external memory-driven analysis, 4-priority test generation, comprehensive document structure with ERD and traceability. Triggers on "test specs", "test specifications", "test cases", "test scenarios", "QA documentation", "Given-When-Then", "BDD", "TDD", "coverage".