fix: resolve sporadic environment variable loading in arty.sh

- Fix race condition in load_env_vars() caused by process substitution
- Replace unreliable `< <(yq eval ...)` with stable variable capture
- Ensure environment variables are consistently loaded on every execution
- Add yq binary (mikefarah/yq v4.48.1) for reliable YAML parsing

🤖 Generated with [Claude Code](https://claude.com/claude-code)

Co-Authored-By: Claude <noreply@anthropic.com>

arty.sh

@@ -51,7 +51,7 @@ log_success() {
 }
 
 log_warn() {
-  echo -e "${YELLOW}[ ]${NC} $1" >&2
+  echo -e "${YELLOW}[<EFBFBD>]${NC} $1" >&2
 }
 
 log_error() {
@@ -65,7 +65,7 @@ log_debug() {
 }
 
 log_step() {
-  echo -e "${CYAN}[’]${NC} $1" >&2
+  echo -e "${CYAN}[<EFBFBD>]${NC} $1" >&2
 }
 
 # ============================================================================
@@ -96,7 +96,8 @@ load_env_vars() {
   log_debug "Loading environment variables from '$current_env' environment"
 
   # First load default variables if they exist
-  if yq eval '.envs.default' "$config_file" 2>/dev/null | grep -q -v '^null$'; then
+  local default_envs=$(yq eval '.envs.default | to_entries | .[] | .key + "=" + .value' "$config_file" 2>/dev/null)
+  if [[ -n "$default_envs" ]] && [[ "$default_envs" != "null" ]]; then
     while IFS='=' read -r key value; do
       if [[ -n "$key" ]] && [[ "$key" != "null" ]] && [[ -n "$value" ]]; then
         # Only export if not already set (for default env only)
@@ -107,18 +108,19 @@ load_env_vars() {
         export "$key=$value"
         log_debug "  Set $key (from default)"
       fi
-    done < <(yq eval '.envs.default | to_entries | .[] | .key + "=" + .value' "$config_file" 2>/dev/null)
+    done <<< "$default_envs"
   fi
 
   # Then load environment-specific variables (which can override defaults)
   if [[ "$current_env" != "default" ]]; then
-    if yq eval ".envs.$current_env" "$config_file" 2>/dev/null | grep -q -v '^null$'; then
+    local env_envs=$(yq eval ".envs.$current_env | to_entries | .[] | .key + \"=\" + .value" "$config_file" 2>/dev/null)
+    if [[ -n "$env_envs" ]] && [[ "$env_envs" != "null" ]]; then
       while IFS='=' read -r key value; do
         if [[ -n "$key" ]] && [[ "$key" != "null" ]] && [[ -n "$value" ]]; then
           export "$key=$value"
           log_debug "  Set $key (from $current_env)"
         fi
-      done < <(yq eval ".envs.$current_env | to_entries | .[] | .key + \"=\" + .value" "$config_file" 2>/dev/null)
+      done <<< "$env_envs"
     fi
   fi
 }
@@ -722,7 +724,7 @@ build_reference_tree() {
 
     # Add location info
     if [[ -n "$into" ]]; then
-      printf " ${MAGENTA}’ %s${NC}" "$into"
+      printf " ${MAGENTA}<EFBFBD> %s${NC}" "$into"
     fi
 
     echo