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

Issue #2540: editing a kind-9 message to add @agent never fired a turn
because (1) Mentions-mode ACP only subscribed to kind 9 (not 40003 edits)
and (2) build_message_edit emitted `p` tags but not explicit `mention`
reference tags that send already attaches.

- Default Mentions subscription kinds include KIND_STREAM_MESSAGE_EDIT
- build_message_edit emits matching `mention` refs with newly added `p`s
- Unit test asserts mention ref on edit-added audience

Closes #2540

Signed-off-by: Bartok9 <danielrpike9@gmail.com>
(cherry picked from commit 4935102)
Signed-off-by: Bartok9 <259807879+Bartok9@users.noreply.github.com>
(cherry picked from commit d3cfe82)
Signed-off-by: Bartok9 <259807879+Bartok9@users.noreply.github.com>
(cherry picked from commit d516ed0)
Signed-off-by: Bartok9 <259807879+Bartok9@users.noreply.github.com>
(cherry picked from commit 0c8ec32)
Signed-off-by: Bartok9 <259807879+Bartok9@users.noreply.github.com>

Author: Bartok9

crates/buzz-acp/src/lib.rs

@@ -25,7 +25,7 @@ use acp::{AcpClient, EnvVar, McpServer};
 use anyhow::{ensure, Context, Result};
 use buzz_core::kind::{
     KIND_MEMBER_ADDED_NOTIFICATION, KIND_MEMBER_REMOVED_NOTIFICATION, KIND_STREAM_MESSAGE,
-    KIND_STREAM_REMINDER, KIND_WORKFLOW_APPROVAL_REQUESTED,
+    KIND_STREAM_MESSAGE_EDIT, KIND_STREAM_REMINDER, KIND_WORKFLOW_APPROVAL_REQUESTED,
 };
 use buzz_core::observer::{
     decrypt_observer_payload, encrypt_observer_payload, OBSERVER_FRAME_TELEMETRY,
@@ -2674,8 +2674,12 @@ async fn tokio_main() -> Result<()> {
                 name: "mentions".into(),
                 channels: filter::ChannelScope::All("all".into()),
                 kinds: config.kinds_override.clone().unwrap_or_else(|| {
+                    // Include kind:40003 message edits so adding an @mention
+                    // via edit can wake the agent the same way a fresh send does
+                    // (#2540). require_mention still gates on a matching `p` tag.
                     vec![
                         KIND_STREAM_MESSAGE,
+                        KIND_STREAM_MESSAGE_EDIT,
                         KIND_WORKFLOW_APPROVAL_REQUESTED,
                         KIND_STREAM_REMINDER,
                     ]

desktop/src-tauri/src/events.rs

@@ -356,6 +356,18 @@ pub struct MessageEditTags<'a> {
 
 /// Kind 40003 — edit a message with full content, media, emoji, mentions,
 /// and optional monotonic link-preview suppression.
+///
+/// Carries the full new content AND a fresh imeta tag set; the receiver overlays
+/// the imeta tags onto the original event so the rendered message reflects exactly
+/// the edited state. NIP-30 custom-emoji tags ride along the same way so an edited
+/// body's `:shortcode:`s stay resolvable (the send path attaches these too).
+///
+/// `mentions` carries the pubkeys of mentions that are *newly added* by this
+/// edit (the caller diffs the edited body against the original). Only those get
+/// a `p` tag (wake/notify) **and** a matching `mention` reference tag (explicit
+/// @mention signal — same as the send path's `MENTION_REFERENCE_TAG`), while a
+/// typo-fix edit that leaves the mention set unchanged emits neither and never
+/// re-wakes anyone. The receiver overlays these onto the original event's audience.
 pub fn build_message_edit(
     channel_id: Uuid,
     target_event_id: EventId,
@@ -368,13 +380,30 @@ pub fn build_message_edit(
         tag(vec!["h", &channel_id.to_string()])?,
         tag(vec!["e", &target_event_id.to_hex()])?,
     ];
-    tags.extend(mention_tags(edit_tags.mentions)?);
-    imeta_tags(edit_tags.media, &mut tags)?;
-    emoji_tags(edit_tags.custom_emoji, &mut tags)?;
+    let p_tags = mention_tags(edit_tags.mentions)?;
+    tags.extend(p_tags.clone());
+    // Parity with send: explicit `mention` refs so relay offline-notice (#1743)
+    // and desktop resolve-mention can treat edit-added @mentions like send.
+    // Prefer caller-supplied mention_refs (snapshot path); otherwise derive
+    // parallel `mention` tags from the p-tags we just emitted.
     if let Some(mention_refs) = edit_tags.mention_refs {
         mention_reference_tags(mention_refs, &mut tags)?;
         tags.push(tag(vec!["buzz:mention-snapshot"])?);
+    } else {
+        let derived_refs: Vec<Vec<String>> = p_tags
+            .iter()
+            .filter_map(|t| {
+                let s = t.as_slice();
+                let pk = s.get(1)?.clone();
+                Some(vec!["mention".to_string(), pk])
+            })
+            .collect();
+        if !derived_refs.is_empty() {
+            mention_reference_tags(&derived_refs, &mut tags)?;
+        }
     }
+    imeta_tags(edit_tags.media, &mut tags)?;
+    emoji_tags(edit_tags.custom_emoji, &mut tags)?;
     if suppress_link_previews {
         tags.push(tag(vec!["link-preview", "none"])?);
     }
@@ -893,6 +922,11 @@ mod tests {
         assert_eq!(tags[0][0], "h");
         assert_eq!(tags[1][0], "e");
         assert_eq!(tags[2], vec!["p".to_string(), ALICE_HEX.to_string()]);
+        // Send-path parity: explicit mention ref for newly added @mentions (#2540).
+        assert!(
+            tags.iter().any(|t| t.as_slice() == ["mention", ALICE_HEX]),
+            "edit-added mention must emit mention ref tag, got {tags:?}"
+        );
     }
 
     #[test]