Two fixes to the fresh-install path:
1. setup.sh: when `corepack enable` runs as a non-root user against a
system-wide Node install (apt-installed to /usr/bin), it fails EACCES
trying to symlink /usr/bin/pnpm, leaving pnpm off PATH. Retry with
sudo when pnpm is still missing — gated to Linux/WSL so macOS
Homebrew prefixes aren't polluted with root-owned shims.
2. SKILL.md step 1: if the probe reports STATUS: unavailable (Node not
installed), install Node BEFORE invoking `bash setup.sh`. The old
flow ran setup.sh first as a diagnostic, which always failed fast,
installed Node, then re-ran — two bootstraps for no reason.
Combined: fresh Linux box now goes Node install -> single setup.sh run.
Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>
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