PR_DESCRIPTION_ISSUE_168.md

Summary

Implements SIP-4 / SEP-46 contract metadata standard for the RWA Marketplace contract.

Changes

Compile-time metadata (Wasm custom section)

• Added contractmeta!() macro entries embedded in the contractmetav0 Wasm section:
  • name: RWA Marketplace
  • version: 0.2.0
  • description: Tokenized Fractional RWA Marketplace
  • sep: 41 (token interface compliance)

Runtime metadata

• Defined ContractMetadata struct with name, version, and description fields (#[contracttype])
• Added ContractMetadata variant to DataKey enum
• Metadata is stored in instance storage during init()
• Added public get_contract_metadata() query function

Tests

• test_get_contract_metadata_returns_expected_values — validates name, version, description
• test_get_contract_metadata_before_init_panics — confirms panic on uninitialized read

Documentation

• Updated docs/architecture.md with SIP-4 section, Wasm entries table, and data type reference

Related

closes #168