chore: release v0.2.0

[prestwich]

Summary

• Bump version from 0.1.0 to 0.2.0
• Add initial CHANGELOG.md with release notes for 0.1.0 and 0.2.0
• Update CLAUDE.md with changelog requirements and correct release process (removed outdated changesets reference)

0.2.0 Release Notes

Added

• Bundle types (SignetEthBundle, SignetCallBundle) with builder classes
• Bundle serialization helpers (serializeEthBundle, serializeCallBundle)
• Order feasibility checking (checkOrderFeasibility)
• Tx-cache client (createTxCacheClient) for submitting orders and bundles
• Passage helpers (enter, enterToken) for bridging to Signet
• WETH helpers (wrapEth, unwrapEth) for wrapping/unwrapping ETH
• Permit2 approval helpers (getPermit2Allowance, approvePermit2, ensurePermit2Approval)
• Token registry with USDC/USDT addresses for Mainnet and Parmigiana
• Viem chain definitions (signetRollup, parmigianaRollup, parmigianaHost)
• New subpath exports: /client, /passage, /weth, /permit2

Changed

• Expanded token mapping utilities

Test plan

• pnpm typecheck passes
• pnpm lint passes
• pnpm format:check passes

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