Bug Description

Ponytail's style rules are designed for English-only conversations. When used in Chinese/Japanese/Korean (CJK) contexts, several issues arise:

1. "Drop articles" instruction is misleading in CJK context: Chinese has no article concept. When ponytail tells the model to drop articles, the model may incorrectly strip English articles embedded in Chinese text (e.g. "a LLM 模型" → "LLM 模型"), losing semantic specificity.

2. "Short synonyms" rule assumes English: The instruction "big not extensive, fix not implement a solution for" only works in English. In CJK, shorter synonyms don't exist in the same way — Chinese characters are already compact.

3. Output style "fragments OK" is language-agnostic but the examples are English-only: CJK users get English examples that don't map to their language patterns.

Proposed Fix

Add CJK detection (similar to caveman PR #576):

1. Detect CJK characters in user input/session context
2. When CJK is detected, modify the per-turn injection to:
   • Skip article-dropping instructions (Chinese has no articles)
   • Keep code-focused rules (stdlib first, YAGNI, shortest diff) — these are language-agnostic
   • Add CJK-specific brevity guidance (e.g. "简短回答，不用敬语")

This is the same approach caveman uses: CJK detection → skip English-specific rules → keep language-agnostic rules.

Related

• Caveman PR fix: reject review as a default mode (pi-extension + config) #576: Same issue fixed for caveman's compression engine
• Can ponytail be used alongside caveman? #18, Does this conflict with caveman? #68: Previous questions about i18n, closed as "works as designed"