hook-authoring

Use when adding or changing a hook in a pluginfinity plugin: a hook entry in pluginfinity.config.ts, a script under hooks/, or its bats test under __test__/. Walks the bats-first loop (fixture, failing run_hook test on both targets, script, config entry, build, bats) and the script rules the hook library depends on. Applies to files matching: **/hooks/**/*.sh, **/pluginfinity.config.ts, **/__test__/**/*.bats