Add Xquik skill

[kriptoburak]

Summary

Adds a built-in xquik skill for X data workflows through Xquik REST and MCP APIs.

Changes

• Adds skills/xquik/SKILL.md
• Documents API key handling, narrow REST examples, MCP access, and approval gates for persistent or bulk work
• Clarifies that xurl remains the right skill for direct account-scoped X API actions

Test evidence

python3 skills/skill-creator/scripts/quick_validate.py skills/xquik
git diff --check
perl -ne 'print if /\x{2014}|\x20\x2d\x2d\x20/' skills/xquik/SKILL.md
curl link checks for https://docs.xquik.com, API overview, and MCP overview
curl route probe for /api/v1/x/tweets/search returned HTTP 402 without credentials

Full pnpm check was not run because this checkout has no installed dependencies and this PR only adds a standalone skill file.

Checklist

• pnpm lint passes
• pnpm typecheck passes
• pnpm test passes
• Tests added for new behavior
• Docs updated if behavior or APIs changed

[chatgpt-codex-connector]

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[kriptoburak]

Addressed in 99140d1.

• REST examples now use x-api-key: ${XQUIK_API_KEY}.
• MCP auth text now matches the same documented API key header.

Validation:

• python3 skills/skill-creator/scripts/quick_validate.py skills/xquik
• git diff --check
• banned punctuation scan
• Xquik docs link checks returned HTTP 200