README: draw the signal path as SVG diagrams

Replace the ASCII signal chain in both READMEs with a rendered diagram
(resources/diagram_en.svg / resources/diagram_ru.svg): SIM card <-> reader
with the passive tap on the contacts, the FX2 logic analyzer, sigrok-cli
with the iso7816 decoder, GSMTAP UDP :4729, and the SIMtrace Analyser /
Wireshark consumers.

The SVGs are hand-authored, self-contained (no scripts, no external
references), carry <title>/<desc>, and each README embeds its own language
variant with the chain repeated in the alt text.

Release packaging: both diagrams are added to the archive allowlist.  The
shared-image equality check ignores them (the READMEs embed different
files by design), while every other resources/ photo must still match
across the two READMEs.  AGENTS.md documents the exception.

README_RUS.md

@@ -8,12 +8,7 @@
 **живым GSMTAP-UDP-стримингом**: дешёвый логический анализатор FX2 (клон
 Saleae) ведёт себя как сниффер SIMtrace2:
 
-```
-SIM-карта ⇄ ридер (пассивный съём с контактов)
-    → логический анализатор FX2 (fx2lafw, 8 каналов, до 24 МГц)
-    → sigrok-cli + декодер iso7816
-    → GSMTAP UDP :4729  →  [SIMtrace Analyser](https://github.com/anttro/simtrace-analyser) / Wireshark
-```
+![Путь сигнала: SIM-карта и ридер с пассивным съёмом с контактов, логический анализатор FX2 (fx2lafw, 8 каналов, до 24 МГц), sigrok-cli с декодером iso7816, GSMTAP UDP :4729, SIMtrace Analyser и Wireshark](resources/diagram_ru.svg)
 
 [SIMtrace Analyser](https://github.com/anttro/simtrace-analyser) —
 рекомендуемый инструмент для визуализации живых трасс и просмотра