chore: replace hard-coded model pins with generic aliases

[jamesc]

Summary

Replaces hard-coded per-skill model: frontmatter with generic aliases so skills track the latest model automatically instead of pinning to a generation that goes stale (the Opus pins were on claude-opus-4-6, a generation behind current).

• claude-opus-4-6 → opus — do-refactor, draft-adr, pick-epic, plan-refactor, review-adr, review-code
• claude-haiku-4-5-20251001 → haiku — linear, resolve-merge, update-issues, whats-next
• Also fixes a stale claude-opus-4.6 reference in review-code's adversarial-review instruction (body text) → opus. The cross-family gpt-5.2-codex example is intentionally left as-is.

10 files, 11 replacements, no other changes.

🤖 Generated with Claude Code

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ℹ️ Review info

⚙️ Run configuration

Configuration used: Organization UI

Review profile: CHILL

Plan: Pro

Run ID: 41b3ad14-0542-44fa-a996-438b5de68d5a

📥 Commits

Reviewing files that changed from the base of the PR and between 4e72afa and 01521c7.

📒 Files selected for processing (10)

• skills/do-refactor/SKILL.md
• skills/draft-adr/SKILL.md
• skills/linear/SKILL.md
• skills/pick-epic/SKILL.md
• skills/plan-refactor/SKILL.md
• skills/resolve-merge/SKILL.md
• skills/review-adr/SKILL.md
• skills/review-code/SKILL.md
• skills/update-issues/SKILL.md
• skills/whats-next/SKILL.md

✨ Finishing Touches

🧪 Generate unit tests (beta)

• Create PR with unit tests
• Commit unit tests in branch chore/model-aliases

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