[Notification] Always notify on human messages, even when forwarded by a bot

## Feature Request / Bug Description
Currently, notifications may be suppressed when a human message is forwarded through a bot. The expected behavior is that any message originating from a human should always trigger a notification, regardless of the delivery channel.

## Expected Behavior
- If a human sends a message directly → notification fires.
- If a human's message is forwarded/relayed by a bot → notification still fires.

The key rule: notification is determined by the **origin** of the message (human vs. bot), not by the **delivery method**.

## Actual Behavior
When a human message is forwarded by a bot, the notification may be skipped, causing the recipient to miss the message.

## Why This Matters
Users can miss important human-initiated messages simply because they were relayed through an automated channel, which is unexpected and can harm communication reliability.

The issue names no files, tests, or entry points, so first locate the notification handling and how message origin is represented. Reproduce both direct human messages and human messages relayed by a bot, then verify that both trigger notifications while bot-originated messages remain governed by the existing behavior.

Written by the indexing model from the issue text.