Add new feature requests notes

NEW_FEAT.md

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+# New Feature Requests
+
+## 1) Multi-Message Mode (human multi-message)
+
+### Config
+- **Multi-message start marker**: configurable, default **↗️**
+- **Multi-message end marker**: configurable, default **↙️**
+- **Multi-message prompt marker**: configurable, default **⤵️**
+
+### Logic
+- When a **human** message contains the **start marker**:
+  - Pause **turn manager** in that channel.
+  - All agents in the channel reply using **no-reply** model.
+  - Channel enters **multi-msg mode**.
+- In multi-msg mode:
+  - Each human message triggers **moderator bot** to reply with the **prompt marker**.
+  - Continues until a human message contains the **end marker**.
+- When a human message contains the **end marker**:
+  - **Turn manager** resumes for that channel.
+  - **Moderator** sends the **scheduler marker** prompting the next agent to speak.
+
+---
+
+## 2) Shuffle Mode (turn order reshuffle)
+
+### Config / Command
+- Maintain `shuffling: boolean` **per Discord channel**.
+- Slash command: `/turn-shuffling [on | off]` to view/control.
+
+### Logic
+- When shuffle is **on**:
+  - After the **last speaker** in the turn list speaks,
+  - Shuffle the **turn order list**.
+  - Constraint: **the previous last speaker must NOT become the first speaker** after shuffle.