v0.1.22 - Maintenance Grace and Proof Protocol Docs

Changes

• Added runtime maintenance grace controls for validators and gateways.
• Added open-ended maintenance grace support for coordinated rollout windows.
• Hardened maintenance grace fallback behavior.
• Normalized capacity-audit GPU name matching for common naming variants.
• Added public proof protocol documentation.

Version

• Validator/proxy version: 0.1.22
• Miner version: unchanged at 0.1.0
• Spec version: 0.1.22