Improve clone-website skill fidelity guardrails

[YurunChen]

Summary

• upgrades .claude/skills/clone-website/SKILL.md with a snapshot contract requirement to keep upstream baselines stable
• adds entity-level resource alignment rules (title, upstream_url, image_url, local_path) to reduce title/image/link drift
• adds interactive parity guidance and hard acceptance gates (broken-image, semantic, visual, and restart determinism checks)

Why

Recent mirror alignment work exposed recurring regressions where pages looked structurally correct but drifted semantically (mismatched image/title/link, non-functional visual-only chips/tabs, and weak fidelity acceptance). This update makes those checks explicit in the phase-1 clone workflow.

Validation

• reviewed the updated skill section flow to ensure it remains consistent with existing clone workflow steps
• verified commands/path conventions remain aligned with current repository patterns

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