feat: v0.8.1 answer sessions from the inbox: allow/deny, peek & reply

- PermissionRequest hook: the state file records tool, detail and
  description of a pending permission; Notification keeps it.
- devdesk attach --answer (presses 1/Esc only if the same wait is on and the
  prompt is visible), --peek (last exchange from the transcript), --reply
  (bracketed paste + Enter, streamed like uploads).
- Inbox: Allow/Deny/Open for permission waits; Peek & reply for other waits
  and finished sessions. Matrix messages include the command.

Closes #22
Closes #23

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>

README.md

@@ -38,6 +38,7 @@ The tmux server runs in its own unit, so every Claude process lives in **that**
   - The sidebar shows it with context % and a context bar; the session chip's dot shows the current session's state.
   - A "… needs you" chip jumps to other sessions that are waiting, and a desktop notification fires when one starts waiting.
   - The **🔔 inbox** lists what needs you (waiting sessions, firing Grafana alerts) and what happened while you were away (a background session finished or started waiting, CI passed or failed); its badge counts them.
+  - **Answer from the inbox:** a session waiting on a permission shows the exact command/file and **Allow / Deny** (the key is pressed only if that prompt is still on screen); other waits and finished sessions offer **Peek & reply**: the last exchange and a reply box.
 - **Matrix "Claude needs you":** when a session has waited for `DEVDESK_MATRIX_DELAY` seconds (30) and no browser tab or SSH client is attached to it, `devdesk-notify-matrix` posts one message per wait, with a link, to the hookshot webhook URL in `/etc/devdesk/matrix-webhook` (mode 600; no file = off).
 - **File & image drop:** drag files onto the terminal or paste a screenshot.
   - They're uploaded through ttyd to `/var/lib/devdesk/uploads/<session>/` (25 MB max, pruned after 7 days), and the path is pasted into Claude.