v0.284.0 — a box deletes old app images (decision 53, R-736); an after_install app is held until its known login is replaced (R-741)

Image retention: after a done/undone guarded Update and at remove, an app's images older than its running
and previous one are deleted — never an image any container, installed compose or installed/previous record
names (box-wide keep set read at delete time); exact id, never forced or pruned; paused while any update runs;
a one-time sweep of catalog app images at the first start. Install hold: an after_install app is installed
behind the setup gate's door and opens when after_install succeeds or the household says it changed the login.
Tests TestImageRetention_* and TestInstallHold_* with red-proofs; parity fixture for the held card.

MinAgent: 0.131.0 (unchanged).

Co-Authored-By: Claude Opus 5.5 (1M context) <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_0159rPz1ZhFKsS53msqPYxtS

controller/internal/web/templates/app_info.html

@@ -85,6 +85,12 @@
          onerror="this.style.display='none'">
 </div>
 
+{{- if .InstallHoldClosed}}
+<div class="app-info-card" style="margin-top:1rem" id="install-hold-card">
+    <h3>{{T "app_info.install_hold_title"}}</h3>
+    <p>{{T "app_info.install_hold_closed"}}</p>
+</div>
+{{- end}}
 {{- if .SetupGateClosed}}
 <div class="app-info-card" style="margin-top:1rem" id="setup-gate-card">
     <h3>{{T "app_info.setup_gate_title"}}</h3>