Document Python 3.13 included by default in Trixie base image

DOCKER_HUB.md

@@ -256,13 +256,13 @@ docker run -it --rm \
 
 ## Python Development with uv
 
-The image includes [uv](https://docs.astral.sh/uv/), a fast Python package manager that replaces pip, venv, and pyenv. Python is not pre-installed but can be installed on demand:
+The image includes Python 3.13 (from Debian Trixie) and [uv](https://docs.astral.sh/uv/), a fast Python package manager that replaces pip, venv, and pyenv:
 
 ```bash
-# Install Python (persists across restarts with devbox-uv volume)
-uv python install 3.14
+# Python 3.13 is available out of the box
+python3 --version
 
-# Create a virtual environment and install dependencies
+# Use uv for package management
 uv venv
 uv pip install -r requirements.txt
 
@@ -274,6 +274,9 @@ uv run python script.py
 
 # Install standalone Python tools
 uvx ruff check .
+
+# Install a newer Python version (persists with devbox-uv volume)
+uv python install 3.14
 ```
 
 To persist Python installs across container restarts, add a named volume: