Fix container username and home mount

README.md

@@ -9,7 +9,7 @@ the host.
 - Arch Linux–based image
 - Runs as the host user (same username, UID, GID)
 - Mounts only the current project directory (same absolute path inside container)
-- Persists OpenCode state in ./container-home directory
+- Persists OpenCode state in XDG_DATA_HOME/opencode-container/container-home directory
 - No access to SSH keys, passwords, or full `$HOME`
 - Simple shell function (`opencode`) to launch interactively
 
@@ -24,10 +24,14 @@ git clone https://git.jeena.net/jeena/opencode-container.git
 Source the helper file `opencode.aliases` in your shell configuration  
 (`.bashrc` or `.zshrc`) so the `opencode` function is available in new sessions.
 
-We set up the ./container-home directory as a central $HOME inside of the
+We set up the XDG_DATA_HOME/opencode-container/container-home directory as a central $HOME inside of the
 container, independent of the session or project directory we start in. This
-presists the whole $HOME from inside the container so everything opencode
-writes into config files, etc. presists there.
+persists the whole $HOME from inside the container so everything OpenCode
+writes into config files, etc. persists there.
+
+## Environment Variables
+
+- `XDG_DATA_HOME`: Override default data directory (default: ~/.local/share)
 
 ## Usage