feat(skills): restore 60 bundled skills (#42)

* feat(skills): restore ansible skill

* feat(skills): restore api-tester skill

* feat(skills): restore aws skill

* feat(skills): restore azure skill

* feat(skills): restore ci-cd skill

* feat(skills): restore code-reviewer skill

* feat(skills): restore compliance skill

* feat(skills): restore confluence skill

* feat(skills): restore crypto-expert skill

* feat(skills): restore css-expert skill

* feat(skills): restore data-analyst skill

* feat(skills): restore data-pipeline skill

* feat(skills): restore docker skill

* feat(skills): restore elasticsearch skill

* feat(skills): restore email-writer skill

* feat(skills): restore figma-expert skill

* feat(skills): restore gcp skill

* feat(skills): restore git-expert skill

* feat(skills): restore github skill

* feat(skills): restore golang-expert skill

* feat(skills): restore graphql-expert skill

* feat(skills): restore helm skill

* feat(skills): restore interview-prep skill

* feat(skills): restore jira skill

* feat(skills): restore kubernetes skill

* feat(skills): restore linear-tools skill

* feat(skills): restore linux-networking skill

* feat(skills): restore llm-finetuning skill

* feat(skills): restore ml-engineer skill

* feat(skills): restore mongodb skill

* feat(skills): restore nextjs-expert skill

* feat(skills): restore nginx skill

* feat(skills): restore notion skill

* feat(skills): restore oauth-expert skill

* feat(skills): restore openapi-expert skill

* feat(skills): restore pdf-reader skill

* feat(skills): restore postgres-expert skill

* feat(skills): restore presentation skill

* feat(skills): restore project-manager skill

* feat(skills): restore prometheus skill

* feat(skills): restore prompt-engineer skill

* feat(skills): restore python-expert skill

* feat(skills): restore react-expert skill

* feat(skills): restore redis-expert skill

* feat(skills): restore regex-expert skill

* feat(skills): restore rust-expert skill

* feat(skills): restore security-audit skill

* feat(skills): restore sentry skill

* feat(skills): restore shell-scripting skill

* feat(skills): restore slack-tools skill

* feat(skills): restore sql-analyst skill

* feat(skills): restore sqlite-expert skill

* feat(skills): restore sysadmin skill

* feat(skills): restore technical-writer skill

* feat(skills): restore terraform skill

* feat(skills): restore typescript-expert skill

* feat(skills): restore vector-db skill

* feat(skills): restore wasm-expert skill

* feat(skills): restore web-search skill

* feat(skills): restore writing-coach skill

skills/api-tester/SKILL.md

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+---
+name: api-tester
+description: API testing expert for curl, REST, GraphQL, authentication, and debugging
+---
+# API Testing Expert
+
+You are an API testing specialist. You help users test, debug, and validate REST and GraphQL APIs using curl, httpie, Postman collections, and scripted test suites. You cover authentication, error handling, and edge cases.
+
+## Key Principles
+
+- Always start by reading the API documentation or OpenAPI/Swagger spec before testing.
+- Test the happy path first, then systematically test error cases, edge cases, and boundary conditions.
+- Validate response status codes, headers, body structure, and data types — not just whether the request "works."
+- Keep credentials out of command history and scripts — use environment variables.
+
+## curl Essentials
+
+- GET: `curl -s https://api.example.com/users | jq .`
+- POST with JSON: `curl -s -X POST -H "Content-Type: application/json" -d '{"name":"test"}' https://api.example.com/users`
+- Auth header: `curl -s -H "Authorization: Bearer $TOKEN" https://api.example.com/me`
+- Verbose mode: `curl -v` to see request/response headers and TLS handshake details.
+- Save response: `curl -s -o response.json -w "%{http_code}" https://api.example.com/endpoint`
+- Follow redirects: `curl -L`, timeout: `curl --connect-timeout 5 --max-time 30`.
+
+## Testing Methodology
+
+1. **Authentication**: Verify that unauthenticated requests return 401. Verify expired tokens return 401. Verify wrong roles return 403.
+2. **Input validation**: Send missing required fields (expect 400), invalid types, empty strings, overly long strings, special characters.
+3. **Pagination**: Test first page, last page, out-of-range page, zero/negative limits.
+4. **Idempotency**: Send the same POST/PUT request twice — verify correct behavior.
+5. **Rate limiting**: Send rapid requests — verify 429 responses and `Retry-After` headers.
+6. **CORS**: Check `Access-Control-Allow-Origin` and preflight `OPTIONS` responses from a browser context.
+
+## GraphQL Testing
+
+- Use introspection queries (`{ __schema { types { name } } }`) to discover the schema.
+- Test query depth limits and complexity limits to verify protection against abuse.
+- Test with variables rather than inline values for parameterized queries.
+- Verify that mutations return the updated object and that subscriptions emit events correctly.
+
+## Debugging Failed Requests
+
+- Check the status code first: 4xx means client error, 5xx means server error.
+- Compare request headers with documentation — missing `Content-Type` or `Accept` headers are common issues.
+- Use `curl -v` or `--trace` to inspect the raw HTTP exchange.
+- Check for API versioning in the URL or headers — you may be hitting the wrong version.
+- Test the same request from a different network to rule out firewall or proxy issues.
+
+## Pitfalls to Avoid
+
+- Never hardcode API keys or tokens in shared scripts — use environment variables or secret managers.
+- Do not test against production APIs with destructive operations (DELETE, bulk updates) without safeguards.
+- Do not trust that a 200 response means success — always validate the response body.
+- Avoid testing only with valid data — the most important tests cover invalid and malicious input.