Add Xquik research skill and fix validator line limit

[kriptoburak]

Type

• New skill
• Bug fix
• Tooling / CI

Summary

• Add xquik-x-research for evidence-backed X audience and market research.
• Document canonical Xquik source, REST, OpenAPI, and MCP references.
• Correct the REST base URL and replace a dead API documentation link.
• Fix validator body-line counting at the no-trailing-newline boundary.
• Add 500-line and 501-line regression tests and run them in CI.

Independent Repository Fix

The validator used body.count("\n"), so a 501-line body without a trailing newline was counted as 500 and incorrectly accepted. It now uses splitlines(), accepts exactly 500 lines, and rejects 501 lines regardless of the final newline.

Checklist

• Read CONTRIBUTING.md and CLAUDE.md.
• One skill plus one focused validator boundary fix.
• Required frontmatter fields are present.
• Body is below 500 lines.
• Directory name matches name.
• User-facing README is current.
• No secrets, absolute local paths, or personal data.
• Version remains 0.1.0 for the new skill.

Validation

• python3 scripts/validate-skills.py
• python3 -m unittest scripts/test_validate_skills.py
• python3 -m py_compile scripts/validate-skills.py scripts/test_validate_skills.py
• actionlint .github/workflows/validate-skills.yml
• Markdown link checks for root and Xquik docs
• git diff --check
• Disclosure, punctuation, and secret-shape scans

Xquik is an independent third-party service. Not affiliated with X Corp. "Twitter" and "X" are trademarks of X Corp.

[kriptoburak]

Published current-upstream repair c252840e2aaed71f744678768ba0e74d64d81479 as 1 signed commit.

The Xquik research skill uses the canonical source, live API and MCP documentation, correct /api/v1 base, current authentication guidance, and required disclosure. The independent repository fix corrects validator line undercounting for bodies without a trailing newline, adds exact 500 and 501-line regression tests, and runs them in CI.

Validation passed for all repository skills, both unit tests, Python compilation, workflow YAML, all 5 live Xquik references, whitespace, and the current upstream diff. No contributor action remains.