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.md

@@ -8,12 +8,7 @@ Fork of [svenso/sigrok_iso7816](https://github.com/svenso/sigrok_iso7816) with
 **live GSMTAP UDP streaming**, making a cheap FX2 logic analyzer (Saleae clone)
 behave like a SIMtrace2 sniffer:
 
-```
-SIM card ⇄ reader (passive tap on the contacts)
-    → FX2 logic analyzer (fx2lafw, 8ch, 24MHz max)
-    → sigrok-cli + iso7816 decoder
-    → GSMTAP UDP :4729  →  [SIMtrace Analyser](https://github.com/anttro/simtrace-analyser) / Wireshark
-```
+![Signal path: SIM card and reader with a passive tap on the contacts, FX2 logic analyzer (fx2lafw, 8 channels, up to 24 MHz), sigrok-cli with the iso7816 decoder, GSMTAP UDP :4729, SIMtrace Analyser and Wireshark](resources/diagram_en.svg)
 
 [SIMtrace Analyser](https://github.com/anttro/simtrace-analyser) is the
 recommended tool for visualising live traces and viewing saved captures —