Claude Test: a safer browser helper and a new all argument

What

Claude Test is a built-in skill run with /claude-test. A skill is a packaged set of instructions Claude can follow. Two parts of it changed.

• The browser helper is a Playwright MCP server (playwright-mcp.mjs), a small program that lets Claude drive a web browser. It now starts with a cleaned-up set of environment variables (settings passed to programs when they start). Values for proxy variables, NODE_OPTIONS, LD_PRELOAD and similar ones are not taken from the project's .claude/settings.json or .claude/settings.local.json, and a warning says so.
• The helper now checks the path to Node.js before using it. Setup results are recorded as diskless, no_node, linked, differs or unwritable.
• A new no_node error appears when no working Node.js is found or Node.js takes too long to answer. It tells you to install Node.js or set a default Node version in asdf or mise, then restart and run /claude-test.
• The skill's argument hint now reads [app folder] [all | words from a spec name, to run only those | fix | onboard], adding all. The skill's bundled instructions file also changed.

Why

A project's settings files can no longer slip values such as NODE_OPTIONS or LD_PRELOAD into the browser helper, and a missing Node.js now produces a clear instruction instead of a silent failure. The new all argument appears to run every spec, though the members only show the hint text.