Rename PersonToken to Vita (soul-bound identity token) and implement
fee exemption system for citizens:
- Add Federation native contract for cross-chain Vita coordination
- Visitor registry for Vita holders from other chains
- Configurable visiting fee percentage (default 50%)
- Inter-chain debt tracking for settlement between chains
- Modify GAS contract to burn fees from Treasury for Vita holders
- Local Vita: 100% paid by local Treasury
- Visiting Vita: Split between local Treasury and inter-chain debt
- Deficit tracking when Treasury is underfunded
- Update mempool and blockchain to skip fee checks for Vita exempt users
- Add IsVitaFeeExempt() to Feer interface
- Modify verifyAndPoolTx() to allow zero-fee transactions
- Rename PersonToken -> Vita across codebase
- Update state, native contract, and tests
- Maintain same functionality with clearer naming
🤖 Generated with [Claude Code](https://claude.com/claude-code)
Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>
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