Collapses the two-phase setup into a single linear skill: steps 1-6
(prereqs through end-to-end CLI ping) run straight through, steps 7-13
(naming, timezone, channel wiring, mounts, QoL, done) are skippable.
Drops the "chat now vs. continue" branch point — after the ping the
flow emits "Test Agent success, proceeding with setup" and continues
directly into the naming questions.
Also updates stale `/new-setup-2` header comments in setup/install-*.sh.
Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>
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