optimize: rsdoctor-skill for faster execution

[yifancong]

Goal

The goal is to optimize the rsdoctor skill for faster and more efficient analysis.

Description

This MR updates the rsdoctor-analysis skill to support a more stable performance analysis workflow:

• Uses the global rsdoctor-agent CLI with version check/install guidance
• Adds a compact default evidence set to avoid large raw outputs
• Tightens output limits and encourages --filter, --compact, and --limit
• Optimizes tree-shaking / side-effects analysis with Top 10 defaults
• Updates the report format to group issues with recommended fixes
• Migrates docs from reference/ to references/
• Simplifies Rsdoctor install and JSON analysis documentation

[chatgpt-codex-connector]

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