Fixes#88198.
Ignore top-level helper scripts in auto-discovered global/workspace extension roots so they do not become manifestless plugin candidates during config validation. Standalone plugin files remain supported when explicitly configured through `plugins.load.paths`, and docs now call out the supported path.
Verification:
- `node scripts/run-vitest.mjs src/plugins/discovery.test.ts src/config/config.plugin-validation.test.ts`
- `node scripts/run-oxlint.mjs src/plugins/discovery.ts src/plugins/discovery.test.ts src/config/config.plugin-validation.test.ts`
- `git diff --check`
- GitHub CI green at `93073bfa85`
- `.agents/skills/autoreview/scripts/autoreview --mode branch --base origin/main`
Thanks @mushuiyu886 for the fix and @mmhzlrj for the report.
f93a558892
