fix: v0.10.1 usage ping uses tab presence; CI-safe test

The usage ping now treats "away" like the needs-you notifier: no DevDesk
tab in view for ~2 minutes. The test sets a presence marker instead of
attaching a tmux client, which never attached in CI. 0.10.0 was never
published.

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_01WHRLCCdXYm41Qx5kNhehaP

debian/changelog

@@ -1,3 +1,13 @@
+devdesk (0.10.1) bookworm; urgency=medium
+
+  * Everything in 0.10.0, which was never published: its CI test for the
+    usage ping depended on attaching a tmux client.
+  * The usage ping counts you as away the same way "Claude needs you" does:
+    no DevDesk tab in view for ~2 minutes. A forgotten background tab no
+    longer silences it.
+
+ -- Jared Vititoe <jjvititoe1@gmail.com>  Mon, 12 Oct 2026 01:45:00 -0400
+
 devdesk (0.10.0) bookworm; urgency=medium
 
   * Matrix "Claude needs you" is quieter and says what is asked (#50):
@@ -13,7 +23,7 @@ devdesk (0.10.0) bookworm; urgency=medium
     worktree if it is clean, and the branch if it is merged.
   * Plan meters show when each window resets. If the pace so far would use
     a window up before then, they warn instead. Matrix gets one message per
-    5-hour window past DEVDESK_USAGE_WARN (90%) when you're away (#45).
+    5-hour window past DEVDESK_USAGE_WARN (90%) when no tab is in view (#45).
   * Repo panel lists the changed files; a click opens the diff (#46).
   * Copy Claude's last reply as Markdown: a session button and a palette
     entry, backed by `--last-reply` (#47).