Cleans up the prose-level v2 references that the rename commit didn't
touch. Skills now describe themselves and the codebase without "v2"
versioning language. /add-X-v2 cross-references in setup, init-first-agent,
and manage-channels updated to /add-X.
Runtime path identifiers (data/v2.db, data/v2-sessions/, container name
nanoclaw-v2) deliberately left as-is — renaming them breaks live installs
without commensurate benefit.
Verified: pnpm run build clean, 326 host tests pass.
Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>
c37609ffc8