docs: clarify the Windows prerequisite, drop the redundant PSK-TLS note

The Windows bullet now states the pyscard wheel situation plainly (3.13
= wheels, no compile; 3.14 = build from source) without repeating the
SCP81 TLS-PSK 3.13+ requirement already given in the Python bullet.

README.md

@@ -750,7 +750,7 @@ The bundled Python server wraps [pySim](https://osmocom.org/projects/pysim/wiki)
 - **Python 3.9+** with `pip`, and **Git** — the app runs on 3.9+, but the **SCP81 TLS-PSK listener needs Python 3.13+** (`ssl`'s PSK callbacks).
 - **Python venv support** — `setup.sh` creates `.venv`; if that fails with `ensurepip is not available` (Debian/Ubuntu ship the venv module separately), install it (`sudo apt install python3-venv`) and run `./setup.sh` again.  An incomplete `.venv` left by the failed run is removed automatically.
 - **Smart card reader** (PC/SC or serial/FTDI) — PC/SC is preferable (`pcsc-lite` + `ccid` on Linux). `pyscard` has no Linux wheels, so it builds from source: install the PC/SC header package too (`libpcsclite-dev` on Debian/Ubuntu, `pcsc-lite-devel` on Fedora; on Arch `pcsclite` includes them).
-- **Windows** — use **Python 3.13 (strongly recommended)**: `pyscard` has precompiled wheels up to 3.13 and the SCP81 TLS-PSK listener needs 3.13+. On 3.14 `pyscard` and some pysim dependency wheels are not available and build from source (needs MSVC C++ Build Tools). 3.9–3.12 run the app but not the SCP81 PSK listener. The SMPP bridge (`smpp.twisted3`) is intentionally skipped on Windows.
+- **Windows** — use **Python 3.13 (strongly recommended)**: `pyscard` ships precompiled wheels for it, so nothing needs compiling; on **3.14** the `pyscard` and some pysim dependency wheels are missing and build from source (needs MSVC C++ Build Tools). The SMPP bridge (`smpp.twisted3`) is intentionally skipped on Windows.
 
 ### Scripts