script/check ran only fmt-check then test, so script/lint was never
invoked anywhere in the gate: make check shims to script/check, the
Dockerfile runs make check, script/cibuild builds the Dockerfile, and
the pre-commit hook calls script/check. The script was dead code that
the README advertised as part of the gate.
It now runs test, lint, fmt-check in the canonical order. script/lint
is hugo --minify --printPathWarnings, which reports render-target
collisions that the plain hugo --minify in script/test does not; that
signal was being discarded.
The gate still modifies no tracked files. script/test and script/lint
both write to public/, which is gitignored and was already written by
script/test before this change.
Corrects the two documents that enumerated the old two-step gate: the
README Entrypoints line for script/check, and the Dockerfile header
comment above the RUN make check that executes it.
