Add test suite for pure calldata/derivation logic

[gskril]

Summary

• Add 32 Bun tests across 4 colocated *.test.ts files covering pure/deterministic logic in utils, v2, cointype, and set calldata encoding helpers.
• Export encodeSetAddr, encodeSetText, encodeSetContenthash, encodeBatchOperation, and batchOperationSchema from set.ts for testability.
• Wire bun run test into CI after typecheck and before build.

Coverage

• utils: name validation/normalization, 2LD label extraction, hex validation, duration defaults
• v2: subname splitting, .eth name assertions, registry/resolver salt derivation, CREATE2 resolver address (Sepolia regression lock), role bitmap constants
• cointype: ENSIP-11 coin type resolution from coinType or chainId
• set: resolver calldata selectors (setAddr, setText, setContenthash) with viem round-trip decode, batch operation schema validation

Test plan

• bun install
• bun run typecheck
• bun test (32 tests, 0 failures)
• CI preview workflow runs tests before build

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commit: 0bedf55