add architecture details and more third-party lib details

third-party/README.md

@@ -44,6 +44,32 @@ Notes:
 | `ApexProxy.dll`, `ApexProxyMain.dll` | no VERSIONINFO | Proprietary (Apex anti-cheat); no public SDK. |
 | `XLSLogin.dll` | no VERSIONINFO | Unknown origin; no public source identified. |
 
+## Statically linked: TinyXML
+
+TinyXML is not a separate DLL; it is compiled into the server EXEs.
+
+- **Identity (observed):**
+  - 9 `TiXml*` RTTI classes appear in 14 of the 16 server EXEs. The two
+    `SMMonitoring` EXEs have none.
+  - In `Agent_Release_x64.exe`, the 12 TinyXML error-table strings and
+    `Failed to open file` appear contiguously at file offset `0x11d570`.
+  - There is no version string in the binary.
+- **Version (inference from the error table):**
+  - The binary contains `Memory allocation failed.`. TinyXML 2.6.x removed that
+    entry; 2.5.1–2.5.3 have it, and their error tables are identical.
+  - So it is 2.5.1–2.5.3, but which one is unresolved. `tinyxml.h` and
+    `tinyxmlparser.cpp` differ between those releases, and the code has not been
+    compared.
+  - 2.5.0 couldn't be fetched, and pre-2.5 releases were not checked.
+- **Directory:** `tinyxml-2.5.3/` holds the latest 2.5.x release, unmodified.
+  - Source: `sourceforge.net/projects/tinyxml`, file `tinyxml_2_5_3.zip`.
+  - SHA-256: `143590aa5930c1326315fb9fe3c0aab316a43751a44582dedd69331004b2c6a1`.
+- **Match:** closest available, not confirmed exact.
+- **Licence:** zlib, so it's fine to commit.
+- **Use:** class layouts and the parser source let you label TinyXML functions
+  in the decompiled output, via the class records' method tables and the error
+  strings above.
+
 ## Statically linked: ProudNet (Nettention) — local-only headers
 
 ProudNet is not a separate DLL; it is linked into the server EXEs.