README: name what the runtime tools do

[wzslr321]

"Tools that let Claude see your running app" read as Marionette only. The hook now names both: reading the logs of the last run (flutter-read-logs) and driving the live app (flutter-marionette).

🤖 Generated with Claude Code

[github-actions]

Hi @wzslr321! 👋 You're a LeanCode member, so a quick sanity check before this ships: is this PR meant for the public marketplace?

Everything merged here becomes publicly visible and is automatically synced into ai-plugins-internal.

• Internal-only content (client-specific guidance, internal processes, backend/PMO plugins, anything not ready to be public) belongs in ai-plugins-internal instead.
• Generally useful, public-ready content is right at home here — the internal repo will pick it up through the sync.

If public is what you intended, just ignore this comment. 🙂