Feature Request: Add locale parameter to buddy_react API for companion language support

Summary

The Dross companion speech bubble messages are generated server-side via the /claude_code/buddy_react API endpoint, but there is no locale or language parameter in the request payload. As a result, companion messages are always returned in English regardless of the user's language preference.

Current Behavior

The buddy_react API request includes:

• name, personality, species, rarity, stats
• transcript (recent conversation context)
• reason (event trigger: "turn", "error", "test-fail", etc.)
• recent (recent bubble history)
• addressed (whether user addressed the companion by name)

But no locale/language field.

Expected Behavior

Users who prefer non-English languages (e.g., Korean, Japanese, French) should be able to receive companion messages in their preferred language.

Proposed Solution

Add a locale parameter to the buddy_react API request, sourced from a companion.language setting in ~/.claude/settings.json.

Example settings.json:

{
  "companion": {
    "language": "ko"
  }
}

Example API request change:

{
  "name": "Dross",
  "personality": "...",
  "transcript": "...",
  "reason": "turn",
  "locale": "ko"
}

Why This Matters

Claude Code is used globally. Non-English speakers enjoy the companion feature but cannot fully appreciate the contextual humor and commentary when it's always in English. A simple locale parameter would make the companion experience accessible to a much wider audience.

Environment

• Claude Code version: 2.1.89
• Platform: macOS (darwin)
• Preferred locale: ko (Korean)