Skip the empty notification container until it is opened

evidence/dm-initial-publication-20261008/README.md

@@ -760,3 +760,34 @@ the header layout epoch unchanged, changed activity still reorders members,
 original widget identities/pins and unchanged prepared resource preserved.
 Raw: `/home/ts/.cache/agent-scratch/channel-label-owner-20261008/source-app.log`.
 Installed latency remains to be measured; no broad pacing pass claimed.
+
+## Channel label fix delivered
+
+Toad573 merged; exact96f961acd cohort built with retained nativec330/Core09a.
+954assets/69packages/2857RECORD/native package matched. Installed original
+activity-order check passed including pin/counts and unchanged header epoch.
+
+Installed same160-wheel/20-message/16-recipient burst: ordered delivery,
+channel-header Layout48 to0 and all other sidebar-source Layout to0. Remaining
+layout sources are message captions/disclosures/bodies/window. This proves the
+competing header writer caused the wasted work. Aggregate pacing still FAIL:
+wheel median19.52ms/p95218.63/max257.07; final backlog2.21ms; framep95105.79/
+max277.09; loopmax114.78. One run does not establish overall speedup.
+
+Original frontend publisher selected channel-label-owner-delivery runtime for
+NEW launches, preserving backend defaults/route/native/running owners. Receipt:
+`.artifacts/channel-label-owner-delivery-20261008/live-publication.json`. Raw
+source/build/installed/publication are under
+`/home/ts/.cache/agent-scratch/channel-label-owner-20261008/`. Existing user
+windows retain loaded modules.
+
+Native121 descriptor review is integrated separately: cursor shape alone is
+paint-only, enums remain conservative and custom pointer-reading renderers
+remain measurement-sensitive. This cohort retains c330 and does not claim the
+later cursor fix installed. Next rendering pass targets the empty collapsed
+notification content resource, preserving native input and actual expanded
+feedback rather than bypassing requests.
+
+The initial evidence append was refused by the shell pre-execution parser on a
+quotation in documentation; no command ran. The original tracked bytes were
+materialized and this edit applied through the ordinary file patch tool.

src/toad/widgets/message_notifications.py

@@ -3,6 +3,7 @@
 from collections import Counter
 
 from agent_comms.presentation import MessageNotification
+from textual.app import ComposeResult
 from textual.content import Content
 from textual.widgets import Collapsible, Static
 
@@ -26,15 +27,18 @@ def __init__(self) -> None:
         self._details: Static | None = None
         super().__init__(title="Notification status not checked", collapsed=True)
 
+    def compose(self) -> ComposeResult:
+        yield self._title
+        if self._details is not None:
+            yield self.Contents(self._details)
+
     @property
     def details(self) -> Static:
         """Acquire the original disclosure body only when it is requested."""
         if self._details is None:
             self._details = Static(markup=False)
             if self.is_mounted:
-                self.query_one(self.Contents).mount(self._details)
-            else:
-                self._contents_list.append(self._details)
+                self.mount(self.Contents(self._details))
         self._details.update(self._detail_text())
         return self._details