Simplify state persistence

Use use local ./data directory instead of
XDG directories.

.gitignore

@@ -0,0 +1 @@
+data

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 via XDG directories
+- Persists OpenCode state in ./data directory
 - No access to SSH keys, passwords, or full `$HOME`
 - Simple shell function (`opencode`) to launch interactively
 

docker-compose.yaml

@@ -15,10 +15,7 @@ services:
     tty: true
 
     environment:
-      XDG_DATA_HOME: "${XDG_DATA_HOME}"
+      HOME: "${PWD}/data"
-      XDG_CONFIG_HOME: "${XDG_CONFIG_HOME}"
-      XDG_STATE_HOME: "${XDG_STATE_HOME}"
-      XDG_CACHE_HOME: "${XDG_CACHE_HOME}"
       UID: "${UID}"
       GID: "${GID}"
 
@@ -26,12 +23,6 @@ services:
       # Current project (read–write)
       - "${PWD}:${PWD}"
 
-      # OpenCode persistence (host directories, writable)
-      - "${XDG_DATA_HOME}/opencode:${XDG_DATA_HOME}/opencode"
-      - "${XDG_CONFIG_HOME}/opencode:${XDG_CONFIG_HOME}/opencode"
-      - "${XDG_STATE_HOME}/opencode:${XDG_STATE_HOME}/opencode"
-      - "${XDG_CACHE_HOME}/opencode:${XDG_CACHE_HOME}/opencode"
-
     cap_drop:
       - ALL
     security_opt:

opencode.aliases

@@ -1,19 +1,9 @@
 OPENCODE_CONTAINER_DIR="$(cd "$(dirname "${BASH_SOURCE[0]:-$0}")" && pwd)"
 
 opencode() {
-    # Set defaults if not already defined
-    : "${XDG_DATA_HOME:=$HOME/.local/share}"
-    : "${XDG_CONFIG_HOME:=$HOME/.config}"
-    : "${XDG_STATE_HOME:=$HOME/.local/state}"
-    : "${XDG_CACHE_HOME:=$HOME/.cache}"
-
     UID=$(id -u) \
     GID=$(id -g) \
     USER=$(whoami) \
-    XDG_DATA_HOME="$XDG_DATA_HOME" \
-    XDG_CONFIG_HOME="$XDG_CONFIG_HOME" \
-    XDG_STATE_HOME="$XDG_STATE_HOME" \
-    XDG_CACHE_HOME="$XDG_CACHE_HOME" \
     docker compose \
         -f "$OPENCODE_CONTAINER_DIR/docker-compose.yaml" \
         run --rm \