[Feature Request]: Support a skill for analyzing dialect capabilities, and reliably list the capabilities for each dialect

### Topic

Any Others

### Description

支持方言能力分析 Skill，稳定输出每个方言的能力列表

No files, tests, or entry points are named. Start by clarifying which dialects, capabilities, and output contract are required, then locate the parser entry points and existing dialect tests. Done means each dialect's capabilities are reliably analyzed and listed with test coverage.

索引モデルが issue の本文から書いたものです。