feat(conducting-code-review): add missing reviewer-side skill

[HelenGreul]

Summary

• Adds skills/conducting-code-review/SKILL.md — the missing third skill in the review workflow

Problem

The repo has requesting-code-review (how to ask for a review) and receiving-code-review (how to handle feedback), but no skill for conducting a review. The reviewer has no guidance.

This means:

• Subagents dispatched as reviewers have no skill to trigger
• Human reviewers using Superpowers get no structured process
• The requesting-code-review skill dispatches a superpowers:code-reviewer subagent, but there's no matching skill on the reviewer side

What the skill covers

• 5-step process: Orient → Read diff → Verify → Categorize → Report
• Separate checklists for code PRs vs prompt/skill PRs (this repo's primary content type)
• Severity classification with criteria to prevent inflation
• Explicit forbidden behaviors (vague feedback, missing verdicts)
• Integration with the subagent-driven-development and GitHub PR workflows
• References the 3-comment-type fetch from PR fix(receiving-code-review): add guidance to fetch all 3 PR comment types #812

Relationship to existing skills

requesting-code-review  →  conducting-code-review  →  receiving-code-review
    (author)                     (reviewer)                  (author)

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