MS pre-review polish followup — log levels + docstring honesty

Three nits I missed in the prior pass:

(1) Two more exception swallows still at logger.debug — the
get_recently_added_albums wrapper and the configured_clients
inner loop. My earlier sed only matched single-line patterns.
Both now log at warning level so a broken Plex / Jellyfin
surfaces in the boot log instead of silently returning [].

(2) registry.py module docstring still claimed it replaced
"33 hand-maintained dispatch sites" — same overclaim I fixed
on the engine docstring. Server-specific chains stay explicit
in web_server.py per the "lift what's truly shared" standard;
the registry just owns name → client lookup. Docstring rewritten
to match reality.

core/media_server/engine.py

@@ -233,7 +233,7 @@ class MediaServerEngine:
             try:
                 return client.get_recently_added_albums(max_results)
             except Exception as exc:
-                logger.debug(
+                logger.warning(
                     "%s get_recently_added_albums raised: %s",
                     self.active_server, exc,
                 )
@@ -256,7 +256,7 @@ class MediaServerEngine:
                 if not hasattr(client, 'is_connected') or client.is_connected():
                     result[name] = client
             except Exception as exc:
-                logger.debug("%s is_connected raised in configured_clients: %s", name, exc)
+                logger.warning("%s is_connected raised in configured_clients: %s", name, exc)
         return result
 
     def reload_config(self, name: Optional[str] = None) -> bool:

core/media_server/registry.py

@@ -3,11 +3,17 @@
 Single source of truth for which servers exist, what their canonical
 names are, and which client class implements each. Replaces the
 historic web_server.py pattern of holding 4 separate client globals
-+ 33 hand-maintained ``if active_server == 'plex' / 'jellyfin' / ...``
-dispatch sites.
+that every dispatch site reached individually.
 
-Adding a new server (e.g. Subsonic, Emby) becomes one ``register``
-call here + the new client class. Web server dispatch stays put.
+Server-specific dispatch chains in web_server.py (playlist add /
+remove / replace, per-server metadata sync, etc.) still hand-branch
+on ``active_server == X`` because the work each server does at those
+sites is genuinely different — but they reach the per-server CLIENT
+through ``engine.client(name)`` (which goes through this registry)
+instead of separate globals.
+
+Adding a new server (Subsonic / Emby) = one ``register`` call here +
+the new client class.
 """
 
 from __future__ import annotations