script/bootstrap kept any yarn found on PATH, so YARN_VERSION applied
only where none was installed. It now keeps the yarn on PATH only when
yarn --version is exactly YARN_VERSION, and otherwise installs that
version as before. The node on PATH is used only when it has the
pinned major version, as REPO_POLICIES.md asks, and is at least
NODE_MIN_VERSION. After installing either, bootstrap looks the tool up
through PATH again, stops, naming the path, if that one fails the same
check, and prints the version it uses, as it does for Go. Every host
script except bootstrap that runs yarn now runs it through the new
script/yarn, which uses the first node on PATH, with ~/.local/bin
first, when it passes the same test, and otherwise the pinned node in
nvm.
Model: opus-5-5
make dev ran yarn dev inline and there was no make build. Both are now
shims, over script/dev and the new script/build. .prettierignore stops
leaving out backend/, so backend/README.md is formatted and checked;
backend/.golangci.yml is left out by name instead: it is the org
standard file whose sha256 backend/script/lint checks, and prettier
would reindent it. .claude/ stays in .prettierignore, as git does not
ignore it. script/install-precommit and the date on bootstrap's pins go
back to the org model; bootstrap, fmt and fmt-check keep what the Go
backend and eslint need, each with a comment saying so.
Model: opus-5-5