fix(ci): add --access public to npm publish, release v0.3.0

[prestwich]

Summary

• Fixes release workflow: scoped packages with npm provenance require --access public
• v0.2.0 GitHub release was created but npm publish failed; this bumps to v0.3.0
• Removes thin viem wrapper functions per SDK scope guidelines (use ABIs + direct viem calls instead)

Changes

CI Fix

• Add --access public to pnpm publish in release.yml

Version Bump

• 0.2.0 → 0.3.0 in package.json

API Cleanup (Breaking)

• Removed enter(), enterToken() - use passageAbi with viem directly
• Removed wrapEth(), unwrapEth() - use wethAbi with viem directly
• Removed getPermit2Allowance(), approvePermit2() - use erc20Abi with viem
• Removed getOutputWitness() - use rollupOrdersAbi with viem
• Removed /weth and /passage subpath exports
• Kept ensurePermit2Approval() which handles USDT-style token edge cases

Documentation

• Updated README with direct viem usage patterns
• Added ABIs section to API reference

Test plan

• pnpm lint passes
• pnpm typecheck passes
• CI passes
• Release workflow creates v0.3.0 tag and publishes to npm

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