This release cuts rank tracking costs by ~3x, plus fixes for MCP tool output and project lookups.

## Improved

- Reduce rank tracking costs by ~3x.
  - Scheduled checks now run through DataForSEO's task queue, and every check stops crawling SERP pages once your domain is found.

## Fixed

- Fix MCP tool output validation so results are no longer rejected after credits are spent, and report tool errors more clearly.
- Avoid an internal error during project access lookups.

Full Changelog: https://github.com/every-app/open-seo/compare/v0.0.20...v0.0.21
