feat: bootstrap he maintainer skill

he-maintainer/references/node-typescript.md

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+# Node / TypeScript Harness Notes
+
+Use this reference for Node.js or TypeScript repositories.
+
+## Common files to inspect
+
+- `package.json`
+- `tsconfig.json`
+- `eslint.config.*` or `.eslintrc*`
+- `vitest.config.*`, `jest.config.*`, `playwright.config.*`
+- `src/`, `apps/`, `packages/`, `tests/`
+
+## Common validation commands
+
+Prefer commands already defined by the repo. Typical examples:
+
+- `npm test`
+- `npm run lint`
+- `npm run build`
+- `npm run typecheck`
+- `pnpm test`
+- `pnpm lint`
+- `pnpm build`
+- `pnpm tsc --noEmit`
+
+## Suggested AGENTS.md sections
+
+- project purpose
+- important directories
+- install / build / test / lint commands
+- constraints on schema, dependencies, and generated files
+- validation order
+
+## Common guardrails
+
+- do not edit generated clients unless the task is specifically about generation
+- avoid lockfile churn unless dependencies truly changed
+- prefer targeted tests before full test suite
+- note whether e2e tests are slow or environment-dependent