dominicrume/cantor8_kya_rails: docs/drafts/sig-membership-route.md

The documented route from here to a Champion Everything below was read on 4 November 2026 from github.com/canton-foundation/canton-dev-fund and is cited by file and line. The gate we had wrong sig-directory.md line 39: "Under CIP-0100, an external Development Fund proposal requires a Champion from…