docs: fix outdated documentation (automated weekly drift check)

[Miyamura80]

Fixes several instances of documentation drift identified across the .claude/skills/ directory.

• The make ci description in code-quality SKILL was missing lint_links and file_len_check.
• The cleanup SKILL was using pip install -r requirements.txt instead of the required uv pip install -r requirements.txt for requirements.txt fallback scenarios.
• The ralph SKILL referred to OpenCode, which has been globally replaced with Claude Code per memory instructions.

Verified that markdown syntax is intact, translation files are not touched, and make ci + make test are passing cleanly.

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PR created automatically by Jules for task 6155697974766177135 started by @Miyamura80

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Summary by cubic

Fixes documentation drift in .claude/skills to match current tooling and naming. Keeps the quality checks accurate and dependency setup consistent.

• Bug Fixes
  • Updated make ci description to include lint_links and file_len_check in .claude/skills/code-quality/SKILL.md.
  • Switched pip install -r requirements.txt to uv pip install -r requirements.txt in .claude/skills/cleanup/SKILL.md.
  • Replaced "OpenCode" with "Claude Code" in .claude/skills/ralph/SKILL.md.

^{Written for commit e4f16ff. Summary will update on new commits.}

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[cubic-dev-ai]

No issues found across 3 files

_{Re-trigger cubic}