Add RDLeader control plane

[happysnaker]

Adds RDLeader, a local-first control plane for supervising AI R&D workers with task ownership, runtime dispatch, result collection, approval gates, and public-safe QA evidence.\n\nProject: https://github.com/happysnaker/RDLeader
Project page: https://happysnaker.github.io/rdleader/\nPublic demo/proof ladder: https://happysnaker.github.io/rdleader/
Detailed proof docs: https://github.com/happysnaker/RDLeader/blob/main/docs/public/landing-page.md

[happysnaker]

Small public-proof update for RDLeader: the project page now routes reviewers through a 10-second support/proof router, and the support route keeps the license/reuse caveat explicit.

Project page: https://happysnaker.github.io/rdleader/
Support/proof router: https://happysnaker.github.io/support/#sponsor-router
Distribution kit: https://github.com/happysnaker/RDLeader/blob/main/docs/public/distribution-kit.md
Submission tracker: https://github.com/happysnaker/RDLeader/blob/main/docs/public/submission-tracker.md

Caveat: RDLeader reuse rights are still blocked on https://github.com/happysnaker/RDLeader/issues/3, so this is a review/proof update, not a license grant.