skip neovim bootstrap in non-interactive mode

Headless nvim plugin/LSP install doesn't work well without a proper
terminal. Auto-skip it alongside non-interactive TUI detection.

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

run_onchange_after_install_main_deps.sh.tmpl

@@ -66,6 +66,7 @@ done
 # Auto-detect non-interactive mode when no real terminal is present
 if [ ! -t 0 ] || [ ! -t 1 ]; then
   NON_INTERACTIVE=1
+  SKIP_NVIM_BOOTSTRAP=1
 fi
 
 # Timeout portability (macOS has gtimeout via coreutils, not timeout)