feat: v0.10.0 quieter Matrix, worktrees, usage pace, repo diffs, copy reply, turn timer, compact

- Matrix "needs you": ignore Claude's idle reminder (no red, no post); post
  only when no tab is in view, after 60 s, once per session per 10 min, and
  say what is asked. Closes #50
- devdesk new NAME PROJECT --worktree: own checkout on devdesk/NAME,
  cleaned up on end when clean/merged. Closes #44
- Usage meters: reset time, pace warning; Matrix ping past 90% when away.
  Closes #45
- Repo panel lists changed files; click opens the diff. Closes #46
- Copy Claude's last reply (--last-reply). Closes #47
- Turn timer in chip, title and cards. Closes #48
- Compact button at 80% context when idle. Closes #49

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

etc/env

@@ -46,9 +46,16 @@ DEVDESK_PUBLIC_URL=https://dev.lotusguild.org
 
 # "Claude needs you" in Matrix when a session waits and no tab or SSH client is
 # attached: put a hookshot webhook URL in this file (mode 600). No file = off.
+# Only real requests (a permission prompt, a question), never Claude's idle
+# reminder, and never while a DevDesk tab is in view.
 # DEVDESK_MATRIX_DELAY: seconds the wait must last before posting.
+# DEVDESK_MATRIX_QUIET: at most one message per session in this many seconds.
 DEVDESK_MATRIX_WEBHOOK_FILE=/etc/devdesk/matrix-webhook
-DEVDESK_MATRIX_DELAY=30
+DEVDESK_MATRIX_DELAY=60
+DEVDESK_MATRIX_QUIET=600
+# DEVDESK_USAGE_WARN: post to the same room once per 5-hour window when plan usage
+# passes this percent while no browser tab or SSH client is attached (devdesk#45).
+DEVDESK_USAGE_WARN=90
 
 # 0 turns off the guard that makes Claude ask before destructive commands
 # (pct/zfs/ceph destroy, rm -r /…, force pushes, reboots). Extra rules: