feat: implement Polygon RPC client with caching and rate limiting (#8)
## Summary - Add PolygonClient for blockchain data queries with rate limiting, retry logic, and Redis caching - Implement Transaction and WalletInfo data models with unit conversions - Add comprehensive test coverage (51 tests) ## Features - Token bucket rate limiter to respect RPC provider limits - Exponential backoff retry logic with configurable attempts - Automatic failover to secondary RPC URL - Redis caching with configurable TTL - Methods: get_transaction_count, get_balance, get_token_balance, get_block, get_wallet_info ## Test plan - [x] All 51 profiler tests pass - [x] Ruff lint passes - [x] Mypy type check passes Closes #8 🤖 Generated with [Claude Code](https://claude.com/claude-code) Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>
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