The compiled OpenCode tools import `tool` from `@opencode-ai/plugin/tool`
at module top level, and the hooks plugin imports those tools statically.
The package was only a devDependency, so production installs (OpenCode's
npm plugin cache, `npm install --omit=dev`) could not resolve it and the
whole plugin failed to load.
Move it to `dependencies` and add a build-opencode regression test that
fails when the built bundle imports a package not declared as a runtime
dependency.
Fixes#3543
(cherry picked from commit 106024070e)
Gaurav Dubey
e4666abb01