[EPIC 2.0] Multichain Support

[mfw78]

Problem

Frame.sh-style global RPC server needed for multi-network management and CLI tool integration.

Success Criteria

• Global RPC at ws://127.0.0.1:1248
• Chain-aware routing
• Per-identity network preferences
• Compatible with cast/forge

Non-goals

L2 optimizations, cross-chain transactions, non-EVM chains

Timeline

Q1 2026

Dependencies

BLOCKED BY: Epic 0, Epic 1
BLOCKS: Epic 3, Epic 4, Epic 7