feat(polymarket): migrate to CLOB V2 SDK, pUSD collateral, and V2 exchange contracts

[AkshatGada]

Polymarket shipped CLOB V2 on April 28, 2026. This PR migrates our entire Polymarket integration to the new infrastructure , new SDK, new collateral token (pUSD), new exchange contracts, and a new order signing format. The V1 SDK no longer works against production.

What changed

SDK swap

• Replaced @polymarket/clob-client + @polymarket/order-utils with @polymarket/clob-client-v2@1.0.0
• ClobClient constructor changed from positional args to options object (chainId → chain, proxy wallet → funderAddress)
• SignatureType → SignatureTypeV2 (now exported from the v2 client directly)

New collateral: pUSD

• Polymarket replaced USDC.e with pUSD as the trading collateral
• Added automatic USDC.e → pUSD wrapping step in the clob-buy flow via the CollateralOnramp contract
• Buy flow is now: smart wallet → USDC.e to proxy wallet → wrap to pUSD → CLOB order

V2 exchange contracts

• Updated CTF_EXCHANGE to 0xE111180000d2663C0091e4f400237545B87B996B
• Updated NEG_RISK_CTF_EXCHANGE to 0xe2222d279d744050d28e00520010520000310F59
• Added constants: PUSD, COLLATERAL_ONRAMP, COLLATERAL_OFFRAMP

Approval flow updated

• Now approves pUSD → V2 exchange, CTF → V2 exchange, USDC.e → CollateralOnramp
• All users (including returning) must re-run approve --broadcast since V2 uses entirely new contracts

Bug fix: proxy wallet ABI

• The proxy wallet function is proxy() (selector 0x34ee9791), not execute() (0xe8454e54)
• The old selector was silently accepted by the factory but did nothing — all proxy wallet calls (approvals, wrapping) were no-ops
• Fixed the ABI function name, confirmed working with on-chain transactions

SKILL.md rewrite

• Updated for V2: pUSD collateral, mandatory re-approval, wrapping flow, updated troubleshooting

Files changed

• packages/polygon-agent-cli/package.json — dependency swap
• packages/polygon-agent-cli/src/lib/polymarket.ts — constants, SDK client, ABI fix
• packages/polygon-agent-cli/src/commands/polymarket.ts — approvals, wrapping step, output labels
• skills/polygon-polymarket/SKILL.md — full rewrite
• pnpm-lock.yaml

Test plan

Tested end-to-end on production V2 (clob.polymarket.com, version: 2) with real on-chain transactions:

• V2 approvals broadcast — tx 0x6cf87c... (3 approvals: pUSD, CTF, USDC.e→Onramp)
• USDC.e → pUSD wrap via CollateralOnramp — tx 0x00b686...
• GTC limit order posted on V2 test endpoint — orderId 0x4d32e7..., status: live
• Order cancelled successfully
• FOK market order Feature/webhook callback #1 matched on production — "Trump ends Iran military ops" — orderId 0x16acbd...
• FOK market order Review updates #2 matched on production — "Hormuz blockade lifted" — orderId 0x488232...
• FOK market order updated flow, fixed fee options #3 matched on production — "Bitcoin $150k" — orderId 0x5a6e4b...
• Positions query returns all 5 positions correctly
• Markets search/browse — Gamma API unchanged, working
• Proxy wallet lookup — working
• Dry-run outputs show correct V2 flow (fund → wrap → order)