feat: add RPC infrastructure — fallback chain, circuit breaker, rate limiter, health monitor#6
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…limiter, health monitor, metrics Phase 3 of RPC provider fallback chain (ev-zwqy per en-25w5 directive). - RpcCircuitBreakerManager: per-(chainId, provider) circuit breakers with 5 failures/60s → OPEN, 30s timeout, 3 successes to close - RpcRateLimiter: per-endpoint token bucket rate limiting from rateLimitRps - RpcFallbackChain: ordered endpoint traversal with CB + RL integration, cache fallback, 30s total timeout, retry maxAttempts=2 with exponential backoff, skip retry on 401/403 - RpcHealthMonitor: background ping per provider/chain (60s interval, accepts eth_blockNumber health check fn) - ProviderMetrics: P50/P95/P99 latency, rolling 5-min error rate 64 new tests across 5 test files. All 842 project tests passing. All classes exported for sol-integration to import.
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Summary
src/rpc/module with 6 components: RpcFallbackChain, RpcCircuitBreakerManager, RpcRateLimiter, RpcHealthMonitor, ProviderMetrics, and typessrc/index.tswith RPC module exportsTest plan
MQ: ev-otl3 | Branch: polecat/obsidian/ev-zwqy@mlr9d1op