feat(tool) show tool usage via channel

[afjcjsbx]

📝 Description

Introduced an (optional) real-time feedback mechanism to notify users when the agent is actively using a tool (e.g., executing a command or searching the web). This vastly improves the UX by showing that the agent is "thinking" and performing actions, rather than just hanging silently while processing.

Key implementations:

• Added a NotificationFormatter interface in the tools package. The core agent loop now checks if a tool implements this interface via type assertion.
• Global Toggle: Added enable_notifications boolean under the tools configuration (defaults to false) so users can silence these intermediate messages if they prefer a cleaner chat.

🗣️ Type of Change

• 🐞 Bug fix (non-breaking change which fixes an issue)
• ✨ New feature (non-breaking change which adds functionality)
• 📖 Documentation update
• ⚡ Code refactoring (no functional changes, no api changes)

🤖 AI Code Generation

• 🤖 Fully AI-generated (100% AI, 0% Human)
• 🛠️ Mostly AI-generated (AI draft, Human verified/modified)
• 👨‍💻 Mostly Human-written (Human lead, AI assisted or none)

🔗 Related Issue

📚 Technical Context (Skip for Docs)

• Reference URL: N/A
• Reasoning:

🧪 Test Environment

• Hardware: PC / Server
• OS: Linux / macOS
• Model/Provider: OpenAI / Anthropic
• Channels: Telegram / CLI

📸 Evidence (Optional)

---

Configuration Example (config.json):
Users can disable this feature globally:

{
  "tools": {
    "enable_notifications": false
  }
}

☑️ Checklist

• My code/docs follow the style of this project.
• I have performed a self-review of my own changes.
• I have updated the documentation accordingly.

[alexhoshina]

Please develop based on the refactor branch. The refactor branch is about to be merged, and PRs developed based on main before the merge will not be reviewed.

The refactor branch is scheduled to be merged during the daytime of February 28, 2026, Beijing Time (GMT+8), with the exact time yet to be determined. You may wait until after the merge to request a PR review Or complete the review before finishing the merge; I will review your PR as quickly as possible We have provided comprehensive migration documentation for the new channel system.