fix(desktop+acp): wake agents on edit-added @mentions

[Bartok9]

Closes #2540

Problem

Editing a channel message to add @AgentName did not wake the agent. Fresh sends with the same mention worked.

Root causes

1. ACP Mentions mode default subscription kinds were only KIND_STREAM_MESSAGE (+ approval/reminder). kind:40003 edits never matched the filter, so even a correct p tag on the edit event could not start a turn.
2. build_message_edit only attached p tags for newly added mention pubkeys (composer already diffs via diffAddedMentionPubkeys). Send attaches both p and explicit mention reference tags (MENTION_REFERENCE_TAG). Edit lacked the mention refs (parity / offline-notice / resolve paths).

Fix

• Include KIND_STREAM_MESSAGE_EDIT in default Mentions kinds (crates/buzz-acp/src/lib.rs). require_mention still requires a matching p tag on the edit event (composer only adds p for newly added mentions — typo-fix edits stay quiet).
• build_message_edit emits paired mention ref tags for those same pubkeys.
• Unit test: edit with added mention emits both p and mention.

Test

cd desktop/src-tauri && cargo test --lib events::tests::edit_

All 3 edit_mention tests passed.

Signed-off-by: Bartok9 <danielrpike9@gmail.com>

[github-actions]

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