hermes - 💡(How to fix) Fix Feature Request: /new all — reset all group topic sessions in one command

Feature Description

On Telegram group chats with topics/threads, each topic gets its own independent Hermes session. Currently, /new (or /reset) only resets the current session you are in. There is no way to reset all topic sessions at once.

When switching to a new model or provider, users have to manually visit every topic and type /new in each one — tedious if you have 5+ active threads.

Proposed Solution

A new slash command that resets all sessions belonging to the current group chat:

• /new all — reset every topic session in the current group
• /reset all — same behaviour, alternate name

The gateway would iterate over all active sessions tied to the current group chat ID and reset them.

Motivation

• Saves time after model/provider changes
• Consistent state — avoids half-reset groups where some topics are on the old model
• Matches user expectation — /new exists per-session, having a bulk variant is the natural next step

Alternatives Considered

• hermes sessions prune — too nuclear, deletes history permanently
• Manual per-topic reset — current workaround, but scales poorly

Implementation Notes

The gateway already tracks sessions by (platform, chat_id, thread_id). A /new all handler could query all sessions matching the current platform + chat_id and issue a reset for each. The trickiest bit is probably sending responses back to the correct threads after reset — each topic needs to acknowledge independently.

Suggested by a user running Hermes on Telegram group chat with topic threads.