Xubin Ren 82dec12f66 refactor: extract tool hint formatting to utils/tool_hints.py
- Move _tool_hint implementation from loop.py to nanobot/utils/tool_hints.py
- Keep thin delegation in AgentLoop._tool_hint for backward compat
- Update test imports to test format_tool_hints directly

Made-with: Cursor
2026-04-07 15:15:07 +08:00
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