feat(wasm-dot): change encodeSs58/validateAddress to accept number prefix

[bitgo-ai-agent-dev]

Summary

• Change encodeSs58(publicKey, format: AddressFormat) → encodeSs58(publicKey, prefix: number) in @bitgo/wasm-dot
• Change validateAddress(address, format?: AddressFormat) → validateAddress(address, prefix?: number) for consistency
• Remove the AddressFormat import from address.ts (no longer used there)
• The AddressFormat enum remains exported from types.ts as named constants for callers

Why

The underlying Rust WASM binding (AddressNamespace.encodeSs58) already accepts a u16 prefix. The TypeScript wrapper was unnecessarily constraining callers to use the AddressFormat enum, requiring an as unknown as AddressFormat cast when bridging from sdk-core's DotAddressFormat enum.

Since AddressFormat is a numeric enum (Polkadot=0, Kusama=2, Substrate=42), existing callers that pass AddressFormat.Polkadot etc. continue to compile without any changes — numeric enum values are assignable to number.

Backward Compatibility

No breaking change. Callers using AddressFormat.Polkadot / AddressFormat.Substrate constants continue to work as-is; TypeScript numeric enums assign to number without a cast.

Follow-up

After this ships, bgms/dot.ts can drop toWasmAddressFormat and the AddressFormat import, passing addressFormat (a DotAddressFormat number) directly to encodeSs58. See T1-57.

Test plan

• Existing tests in test/address.ts use AddressFormat.Substrate / AddressFormat.Polkadot as named constants and still compile and pass without changes
• TypeScript compilation succeeds (no noUnusedLocals errors — AddressFormat was removed from address.ts where it was used, and remains in types.ts and tests)

Ticket: T1-57
🤖 Generated with Claude Code

[bitgo-ai-agent-dev]

Closing in favour of PR #203 (btc-3117/wasm-dot-address-format-union-type), which takes a better approach: replacing the enum with a type AddressFormat = 0 | 2 | 42 union + const AddressFormat object. That keeps callers type-safe (no arbitrary number accepted) while still eliminating the as unknown as cast in bgms, which was the goal. The as const satisfies Record<string, AddressFormat> in #203 is correct — it narrows the const object's values to literal types while validating them against the union.