SDK TypeScript: add React hooks for common operations

[Tristan-Stoltz-ERC]

The TypeScript SDK (sdk-ts/, 37 modules, ~226K LOC, 6,316 tests) provides raw API bindings but no framework-specific helpers.

Proposed hooks

• useProposal — fetch and subscribe to proposal updates
• useIdentity — current user identity and tier
• useGovernanceVote — cast votes with optimistic updates
• useClusterEvents — subscribe to cluster signal streams
• useConsciousnessGating — current tier and progression

Requirements

• WebSocket subscription management (auto-connect/reconnect)
• Optimistic updates with rollback on failure
• Error states and loading indicators
• TypeScript generics for type-safe responses

This would dramatically lower the barrier for web developers building on Mycelix.