tooling(console): build-console.sh tests OBJECTUI_ROOT with -d .git, so a linked objectui worktree is ignored and the build silently uses the shared sibling checkout #22429

Filing gate ① — a finding: a repo script silently swaps the checkout it was told to use. reach: scripts/build-console.sh, which pnpm objectui:build runs (AGENTS.md: "Moving the pin has a second half: regenerate the committed manifest — pnpm objectui:build …").

What is wrong

At origin/main 27a8b33dec, scripts/build-console.sh:162–:166:

if [[ -n "${OBJECTUI_ROOT:-}" && -d "${OBJECTUI_ROOT}/.git" ]]; then
  SOURCE_ROOT="$OBJECTUI_ROOT"
elif [[ -d "${FRAMEWORK_ROOT}/../objectui/.git" ]]; then
  SOURCE_ROOT="$(cd "${FRAMEWORK_ROOT}/../objectui" && pwd)"
fi

• In a linked git worktree, .git is a regular file holding a gitdir: pointer, so -d is false for every linked objectui worktree.
• An OBJECTUI_ROOT that names one is ignored with no message, and the script falls back to the sibling ../objectui checkout.
• It then works in that shared checkout: git fetch when the pin is missing (:178–:179), git worktree prune (:200), and the build worktree for .cache/objectui-<sha> is registered there.

scripts/bump-objectui.sh already fixed the same test. Its comment at :157–:160 reads: "-e, not -d: in a git WORKTREE .git is a regular file holding a gitdir: pointer, so a -d test rejected every linked worktree — and AGENTS.md requires one per task, so this rejected the mandated workflow and only ever worked from a primary clone." build-console.sh did not get the same change.

Where it was met

• On PR chore(objectui): bump the console pin to f0268ad78485 (carries objectui#11880) #22412 (the console pin bump for chore(objectui): bump the console pin past objectui 5bc55c0c5a1e — it carries objectstack-ai/objectui#11880, which #11509's v18 retirement must ship with #22385), the dev saw the fallback and recorded it in the PR's Acceptance notes.
• The dev built from a scratch repository that uses objectui's object store as an alternate, so nothing was registered in the shared checkout.
• The at-tier contract review on that PR (6075438386) escalated it as owed a card. This is that card.

Done when

• build-console.sh accepts a linked worktree as OBJECTUI_ROOT, the way bump-objectui.sh does.
• An OBJECTUI_ROOT that is set but is not a checkout is refused with a message. It is never silently replaced by the sibling.
• The fix is pinned by a test or self-test the repo already runs.

Generated by Claude Code