feat: add Rsdoctor v2 migration skill

[yifancong]

Summary

This PR adds a dedicated migration skill for projects moving from Rsdoctor 1.x to 2.0. It covers compatibility gates, package and ESM changes, configuration replacements, MCP-to-Agent CLI migration, and behavior-preserving validation.

TODO

• After mergering, modify the description of the corresponding rsdoctor packages of rsdoctor-analysis

Related Links

https://rsdoctor.rs/guide/start/migration-v2

[chatgpt-codex-connector]

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[chatgpt-codex-connector]

Update the analysis skill to recognize @rsdoctor/core

After this replacement, a migrated project that later invokes rsdoctor-analysis without an existing rsdoctor-data.json is treated as having no plugin: its Generation Gate only detects @rsdoctor/rspack-plugin or @rsdoctor/webpack-plugin (skills/rsdoctor-analysis/SKILL.md lines 44-52), and the referenced setup guide installs and imports @rsdoctor/rspack-plugin (references/install-rsdoctor-rspack.md lines 17-20 and 55-56). That adds the legacy plugin back alongside 2.x, directly undoing this migration and violating the new no-mixed-versions guardrail, so the analysis gate and installation references need a v2 @rsdoctor/core path as part of this change.

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