README: replace the one-line v1 migration note with a collapsed
<details> block. Quick Start stays compact for the common case (fresh
install) while v1 users get the actual instructions. Calls out
explicitly that the script must be run from a real terminal — not from
inside a Claude session — so the channel-select / switchover prompts
and the Node/pnpm/Docker bootstrap all work.
migrate-from-v1 skill: add a Preflight section that aborts if
logs/setup-migration/handoff.json is missing. Without this, invoking
the skill before the script just leads Claude to start guessing /
running shell commands. The new message redirects them to the script
and tells them it'll hand back to Claude on completion.
Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>
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