Add Guardian health stats (approvals, high risk, value at risk) to sidepanel

Wire Guardian to rescue_service for full-chain approval scanning

increase guardian RPC scan depth to ~180 days (5.2M blocks)

feat: switch guardian from dead Etherscan v2 API to direct RPC calls

feat: show wallet health score in guardian side panel tab

fix: guardian health score no longer reports 'excellent' when data unavailable

fix: make guardian alerts public when filtered by wallet address

fix(ci): replace deprecated pyCrypto keccak with eth_utils.crypto

fix: 10 bugs from full codebase audit

feat(v3): wire V3 features end-to-end — guardian on-chain, Tenderly simulation, threat graph seeding, extension v3.0.0, SDK publish, landing update

docs: add V3 agent firewall design doc and Phase 0 implementation plan

feat(v3): implement all V3 phases — MCP server, guardian, reputation, injection scanner, threat graph, anomaly detection, tier service

fix(firewall): auth scoping, cached spend tracking, analyzer error handling

fix(sdk): raise ShieldBotError on 4xx, reserve fail-mode for transient errors

fix(db): atomic spend update, stale reset, NaN score handling