feat: add new skills for coding standards, continuous learning, detail layout, form layout, project guidelines, security review, and verification loop

- Introduced coding standards for TypeScript and React in SKILL.md.
- Added continuous learning skill with configuration and evaluation scripts.
- Created detail layout guidelines for read-only pages.
- Established form layout rules for data-entry forms.
- Documented project guidelines for the frontend monorepo.
- Implemented security review checklist for frontend/Electron applications.
- Developed a verification loop skill for comprehensive session checks.

This commit enhances the skill set available for developers, ensuring adherence to best practices and improving code quality.

.cursor/rules/testing.mdc

@@ -0,0 +1,40 @@
+---
+description: TDD workflow, 80% coverage minimum, Vitest unit tests, and browser journey verification
+alwaysApply: true
+---
+
+# Testing Requirements
+
+## Minimum Test Coverage: 80%
+
+Test types:
+
+1. **Unit tests** — pure functions, transformers, validators, stores, utilities (`*.test.ts` / `*.test.tsx`, colocated or `__tests__/`)
+2. **Component tests** — Testing Library in packages that already have it (`packages/ui`, `packages/core-events`)
+3. **App journeys** — browser verification of `apps/web` flows (login, index / form / detail). There is no Playwright or NestJS E2E suite in this repo.
+
+Runner: **Vitest**. Root command: `pnpm test`. Per-package: `pnpm --filter <pkg> test`. Also `pnpm typecheck` and `pnpm check:all`.
+
+## Test-Driven Development
+
+MANDATORY workflow:
+
+1. Write test first (RED)
+2. Run test — it should FAIL
+3. Write minimal implementation (GREEN)
+4. Run test — it should PASS
+5. Refactor (IMPROVE)
+6. Verify coverage (80%+)
+
+## Troubleshooting Test Failures
+
+1. Use **tdd-guide** agent
+2. Check test isolation
+3. Verify mocks are correct (`@repo/core-api` services, HTTP client — not a database)
+4. Fix implementation, not tests (unless tests are wrong)
+
+## Agent Support
+
+- **tdd-guide** — Use PROACTIVELY for new features, enforces write-tests-first
+- **e2e-runner** — Frontend journeys: Vitest + Testing Library, plus browser verification for `apps/web`
+- Skill: `.agents/skills/tdd-workflow/`