Add evm defi-positions command for DeFi portfolio positions

[ivpusic]

Add dune sim evm defi-positions <address> supporting Erc4626, Tokenized, UniswapV2, and NFT position types with --chain-ids filter, aggregation summaries (total USD by chain), text table and JSON output.

[ivpusic]

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• Add svm transactions command with signature extraction and block time formatting #39
• Add svm balances command with SimClient wiring #38
• Add evm defi-positions command for DeFi portfolio positions #37 👈 (View in Graphite)
• Add evm token-holders command with token address as positional arg #36
• Add evm token-info command for token metadata and pricing #35
• Add evm collectibles command for NFT listings with spam filtering #34
• Add evm transactions command and fix OpenAPI spec gaps across all EVM commands #33
• EVM activity #31
• Sim evm stablecoins #30
• Get balance #29
• Sim evm balances #28
• Supported chains #27
• Sim auth #26
• main

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PR Summary

Medium Risk
Introduces a new CLI surface that calls a new /beta/evm/defi/positions API and parses polymorphic response data, so behavior depends on API stability and response shape (including aggregation handling).

Overview
Adds a new dune sim evm defi-positions <address> command that fetches DeFi portfolio positions from /beta/evm/defi/positions/{address} with optional --chain-ids filtering and supports -o json passthrough.

For text output, it renders a positions table with per-type DETAILS formatting (ERC-4626, tokenized lending tokens, Uniswap V2 LP, and Uniswap V3/V4 NFT positions) and prints an optional aggregation summary (total USD value plus per-chain breakdown). Includes integration-style CLI tests plus unit tests for the details/formatting helpers, and wires the command into the sim evm command tree.

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