v0.21.0 - RFC Program Batch 1

v0.21.0 - RFC Program Batch 1

Added

• First batch of Genesis Mesh protocol RFCs under docs/rfcs/, covering sovereign identity, recognition treaties, trust bundles, revocation feeds, capability manifests, the Connectome model, operator continuity, and the managed operator role.
• RFC index recording draft status and mapping each RFC to its reference implementation module.
• Wired the RFC section into the documentation tree and linked it from the RFC program direction document.

Changed

• Linked the RFC program's initial sequence to the published draft documents.
• Bumped package metadata to 0.21.0.

Verified

• 297 pytest tests passed.
• Mypy, compileall, Sphinx docs (warnings-as-errors), full pre-push hooks, and package build passed.