Fix Payment type and update TypeScript package documentation

- Remove erroneous `defaultAddress` field from Payment interface
- Update Payment JSDoc example to remove defaultAddress reference
- Add comprehensive README.md for TypeScript package with current type definitions
- Update CLAUDE.md with accurate Participant, Agent, and Party type information
- Add nameHash examples to travel rule compliance section

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Co-Authored-By: Claude <noreply@anthropic.com>

Author: pelle