* fix(cli): drop the never-produced dist/index.cjs requirement from prepublish's opencode-plugin skip check (#11787)
* test(build): resolve tsup/npm portably in the #11787 regression test instead of a hardcoded .bin path
The old test assumed @omniroute/opencode-plugin/node_modules/.bin/tsup
already existed. A fresh checkout (CI's npm ci never installs this
standalone package's own deps) has no such node_modules at all, so the
test failed with MODULE_NOT_FOUND in CI while passing locally on a devbox
that had installed it before. Mirror scripts/build/prepublish.ts's own
install-then-resolveLocalBinEntry approach.
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Co-authored-by: Markus Hartung <mail@hartmark.se>
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