[SDK] buildWrapCalldata + WrapERC7984 explain/verify

[0xPrabh]

Description

Adds buildWrapCalldata(to, amount, rate?) and WrapERC7984 transaction support for the ERC-7984 shield path.

• Encodes wrap(address,uint256) with selector 0xbf376c7a
• Validates checksummed to, amount > 0, and optional amount × rate uint64 fit (euint64)
• Adds TransactionType.WrapERC7984 with builder + classifyTransaction mapping
• Erc7984Token.verifyTransaction wrap branch (direct + sendMultiSig shapes); self-directed to == baseAddress
• Does not set gasLimit (WP owns gas)

Issue Number

CHALO-1154

Parent: CHALO-1135

Type of change

• New feature (non-breaking change which adds functionality)

How Has This Been Tested?

• yarn workspace @bitgo/abstract-eth unit-test --grep "buildWrapCalldata|Method IDs" (19 passing)
• BITGOJS_TEST_PASSWORD=password yarn workspace @bitgo/sdk-coin-eth unit-test --grep "WrapERC7984|verifyTransaction – Wrap" (13 passing)
• eslint on touched files

Checklist:

• My code follows the style guidelines of this project
• I have performed a self-review of my own code
• My commits follow Conventional Commits and I have properly described any BREAKING CHANGES
• The ticket or github issue was included in the commit message as a reference
• I have added tests that prove my fix is effective or that my feature works
• New and existing unit tests pass locally with my changes

Made with Cursor

[linear-code]

CHALO-1154