claude_startup: flip default to setup-only, add --launch flag

Default behavior is now setup-only (symlinks + binary, no interactive launch)
so array_started.sh can call it directly without arguments. Use --launch to
start an interactive Claude session.

Tools/claude_startup.sh

@@ -23,12 +23,10 @@
 # ==============================================================================================
 #
 # claude_startup.sh
-#     Set up persistent symlinks and launch Claude.
+#     Set up persistent symlinks only — default, used by array_started.sh on boot.
 #
-# claude_startup.sh --setup
-#     Set up persistent symlinks only — do not launch Claude.
-#     Used by array_started.sh to prepare the environment on boot without
-#     immediately launching an interactive session.
+# claude_startup.sh --launch
+#     Set up persistent symlinks and launch Claude interactively.
 #
 # ==============================================================================================
 
@@ -36,8 +34,8 @@ PERSIST_DIR="/mnt/user/appdata/claude-code"
 CLAUDE_DATA="$PERSIST_DIR/.claude"
 CLAUDE_BIN="$PERSIST_DIR/local/share/claude"
 
-LAUNCH=true
-[[ "$1" == "--setup" ]] && LAUNCH=false
+LAUNCH=false
+[[ "$1" == "--launch" ]] && LAUNCH=true
 
 # Standalone — no common.sh dependency
 _log()  { echo "  ✅  $*"; }