Extract the runner logic into its own file so the stubs can be minimal

install/packaging/npm.sh

@@ -2,7 +2,7 @@ omarchy-npm-install @openai/codex codex
 omarchy-npm-install @google/gemini-cli gemini
 omarchy-npm-install @github/copilot copilot
 omarchy-npm-install opencode-ai opencode
-omarchy-npm-install playwright playwright-cli
+omarchy-npm-install playwright playwright-cli playwright
 omarchy-npm-install @earendil-works/pi-coding-agent pi
 omarchy-npm-install @kitlangton/ghui ghui
 omarchy-npm-install hunkdiff hunk