fix: let extra bots see peer music state for !similar/!tags

_current_meta now checks registry._bots for peer bot music state
when the current bot has nothing playing. Fixes merlin reporting
"Nothing playing" while derp is actively streaming.

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

plugins/lastfm.py

@@ -109,15 +109,23 @@ def _current_meta(bot) -> tuple[str, str]:
     """Extract artist and title from the currently playing track.
 
     Returns (artist, title). Either or both may be empty.
-    Tries the music plugin's current track metadata, falling back to
-    splitting the title on common separators.
+    Tries the music plugin's current track metadata on this bot first,
+    then checks peer bots (shared registry) so extra bots can see what
+    the music bot is playing.
     """
-    music_ps = bot._pstate.get("music", {})
-    current = music_ps.get("current")
-    if current is None:
-        return ("", "")
-    raw_title = current.title or ""
-    return _parse_title(raw_title)
+    # Check this bot first, then peers
+    candidates = [bot]
+    for peer in getattr(getattr(bot, "registry", None), "_bots", {}).values():
+        if peer is not bot:
+            candidates.append(peer)
+    for b in candidates:
+        music_ps = getattr(b, "_pstate", {}).get("music", {})
+        current = music_ps.get("current")
+        if current is not None:
+            raw_title = current.title or ""
+            if raw_title:
+                return _parse_title(raw_title)
+    return ("", "")
 
 
 # -- Discovery orchestrator --------------------------------------------------