v3.24.0 review: the ARR fetch retry and the DF-scope note

- pysimArrEnsure no longer caches a transient /api/arr fetch failure:
  the next file click retries instead of silently showing no ARR rules
  for the rest of the card session (a success is still cached per
  session, and a session change refetches).
- The help (EN/RU) and both AGENTS state the cache scope: only the MF
  (2F06) and ADF.USIM (6F06) ARR copies are read - a reference to
  another DF's copy is left unresolved.
- Test: the transient failure retries, a success is cached, a session
  change refetches.  869 frontend + 856 Python; sw cache simple-v423.

frontend/help.html

@@ -396,7 +396,7 @@
 	<p class="mb-3">Connects to a local <a href="https://github.com/anttro/simple" class="text-blue-600 dark:text-blue-400 hover:underline">pysim-simple-server</a> for live card operations: enter the server URL (default <code class="font-mono text-sm">http://127.0.0.1:8080</code>) and press <strong>Connect</strong>. The status area shows the reader/card state, and <strong>Equip card</strong> (re)initializes the card after insertion. Sub-tabs: <strong>File manager</strong>, <strong>pySim command line</strong>, and <strong>Raw APDU</strong>. The <strong>Profiler</strong> and <strong>Simulator</strong> are separate top-level tabs.</p>
 
 	<h3 id="file-manager" class="text-lg font-medium mb-2">6.1 File manager</h3>
-	<p class="text-sm mb-2">The file system tree is displayed on the left; selecting a file opens its detail pane on the right. Entries are grouped with DFs above EFs and sorted by <strong>FID</strong> or symbolic <strong>Name</strong> (pills pinned above the scrolling tree together with <strong>Probe all files</strong>; the choice is remembered in <code class="font-mono text-sm">localStorage</code>). Selecting a file also shows its FID, file type, size / record layout and the decoded FCI — in a bordered block labelled with the file&rsquo;s symbolic name — above the content pane. When the FCI references its access rules through an <code class="font-mono text-sm">EF.ARR</code> record (security attribute <code class="font-mono text-sm">8B</code>), the rules of the referenced record are shown as indented lines under that row: they are resolved from the card&rsquo;s <code class="font-mono text-sm">EF.ARR</code> copies (read once per card session at equip, refreshed on reset/equip and after an <code class="font-mono text-sm">EF.ARR</code> write); a snapshot resolves the same references from its own captured copy.</p>
+	<p class="text-sm mb-2">The file system tree is displayed on the left; selecting a file opens its detail pane on the right. Entries are grouped with DFs above EFs and sorted by <strong>FID</strong> or symbolic <strong>Name</strong> (pills pinned above the scrolling tree together with <strong>Probe all files</strong>; the choice is remembered in <code class="font-mono text-sm">localStorage</code>). Selecting a file also shows its FID, file type, size / record layout and the decoded FCI — in a bordered block labelled with the file&rsquo;s symbolic name — above the content pane. When the FCI references its access rules through an <code class="font-mono text-sm">EF.ARR</code> record (security attribute <code class="font-mono text-sm">8B</code>), the rules of the referenced record are shown as indented lines under that row: they are resolved from the card&rsquo;s <code class="font-mono text-sm">EF.ARR</code> copies &mdash; the MF copy (<code class="font-mono text-sm">2F06</code>) and the ADF.USIM copy (<code class="font-mono text-sm">6F06</code>): read once per card session at equip, refreshed on reset/equip and after an <code class="font-mono text-sm">EF.ARR</code> write; a snapshot resolves the same references from its own captured copy. A reference to another DF&rsquo;s ARR copy is not resolved (the row stays as it is).</p>
 	<ul class="list-disc list-inside text-sm space-y-1 mb-3">
 		<li><strong>Read raw / Read decoded</strong> — read the selected file as a hex dump or as a decoded field table (client-side EF decoders: IMSI, ICCID, SPN, PLMN lists, LOCI/PSLOCI/EPSLOCI, ADN/MSISDN, service tables, SUME, …); the server-side pySim JSON of the same read stays available in the collapsed <em>pySim JSON (server)</em> disclosure. The highlighted pill is the current view; clicking either pill (re-)reads the file. <strong>Read decoded</strong> is disabled when the client-side decoders do not cover the file (name/FID check, before reading).</li>
 		<li><strong>Edit raw</strong> — edit the raw hex data, <strong>Save</strong> to write back (or <strong>Cancel</strong>); transparent files use a textarea, record files one input per record with selection checkboxes. The decoded view is read-only — <strong>Edit raw</strong> switches to the hex view first and reads the file if needed.</li>