test(CDPBrowser): tunnel-proof Kitesurf pre-existing tests, untrack plans/006

Kitesurf's pre-existing example.com tests used amOnPage('/'), which broke
once the instance url could point at a SITE_URL tunnel instead. Switch
them to absolute URLs so they pass regardless of the configured base url.

plans/ is intentionally untracked in this repo; drop plans/006 from the
index (content unchanged on disk) to keep that convention.

Co-Authored-By: Claude Fable 5 <noreply@anthropic.com>

Author: DavertMik