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Garry Tan
81b768109e
Clones gbrain at a pinned commit (v0.18.2) and registers it via `bun link`. Before any clone: D5 detect-first — probes ~/git/gbrain, ~/gbrain, and the install target for a valid pre-existing clone (package.json with name "gbrain" and bin.gbrain set). If one is found, `bun link` runs there instead of cloning a second copy. Prevents the day-one duplicate-install footgun on the skill author's own machine. After install: D19 PATH-shadow guard — reads the install-dir's package.json version, compares to `gbrain --version` on PATH. On mismatch: exits 3, prints every gbrain binary on PATH via `type -a`, and gives a remediation menu. Setup skills refuse broken environments instead of warning and continuing. Prereq checks (bun, git, https://github.com reachability) fail fast with install hints. --dry-run and --validate-only flags let the skill probe the plan without touching state; tests use them to cover D5 and D19 without exercising real bun link. Pin is a load-bearing version: setup-gbrain v1 verified against gbrain v0.18.2. Updating requires re-running Pre-Impl Gate 1 to verify gbrain's CLI + config shapes haven't drifted. Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>