refactor(wasm-solana): remove unused instruction-level builder

Remove the instruction-level `buildTransaction` API that was replaced
by `buildFromIntent`. The intent-based API is now used in production
by wallet-platform for all transaction building.

Removed:
- src/builder/ module (build.rs, types.rs, versioned.rs)
- src/wasm/builder.rs WASM bindings
- js/builder.ts TypeScript wrapper
- test/builder.ts tests
- All builder type exports from index.ts

The `buildFromIntent` API remains as the primary transaction building interface.

Author: lcovar

packages/wasm-solana/js/builder.ts

@@ -8,7 +8,6 @@ export * as keypair from "./keypair.js";
 export * as pubkey from "./pubkey.js";
 export * as transaction from "./transaction.js";
 export * as parser from "./parser.js";
-export * as builder from "./builder.js";
 
 // Top-level class exports for convenience
 export { Keypair } from "./keypair.js";
@@ -21,7 +20,6 @@ export type { AddressLookupTableData } from "./versioned.js";
 
 // Top-level function exports
 export { parseTransaction } from "./parser.js";
-export { buildTransaction, buildFromVersionedData } from "./builder.js";
 export { buildFromIntent } from "./intentBuilder.js";
 
 // Intent builder type exports
@@ -93,45 +91,3 @@ export type {
   StakePoolWithdrawStakeParams,
   UnknownInstructionParams,
 } from "./parser.js";
-
-// Builder type exports (prefixed to avoid conflict with parser/transaction types)
-export type {
-  TransactionIntent,
-  NonceSource as BuilderNonceSource,
-  BlockhashNonceSource,
-  DurableNonceSource,
-  AddressLookupTable as BuilderAddressLookupTable,
-  Instruction as BuilderInstruction,
-  TransferInstruction,
-  CreateAccountInstruction,
-  NonceAdvanceInstruction,
-  NonceInitializeInstruction,
-  AllocateInstruction,
-  AssignInstruction,
-  MemoInstruction,
-  ComputeBudgetInstruction,
-  // Stake Program
-  StakeInitializeInstruction,
-  StakeDelegateInstruction,
-  StakeDeactivateInstruction,
-  StakeWithdrawInstruction,
-  StakeAuthorizeInstruction,
-  StakeSplitInstruction,
-  // SPL Token
-  TokenTransferInstruction,
-  CreateAssociatedTokenAccountInstruction,
-  CloseAssociatedTokenAccountInstruction,
-  MintToInstruction,
-  BurnInstruction,
-  ApproveInstruction,
-  // Jito Stake Pool
-  StakePoolDepositSolInstruction,
-  StakePoolWithdrawStakeInstruction,
-  // Custom Instruction
-  CustomInstruction as BuilderCustomInstruction,
-  CustomAccountMeta,
-  // Raw Versioned Transaction Data (for fromVersionedTransactionData path)
-  RawVersionedTransactionData,
-  VersionedInstruction as BuilderVersionedInstruction,
-  MessageHeader,
-} from "./builder.js";

packages/wasm-solana/js/index.ts

@@ -9,9 +9,7 @@
 import {
   WasmVersionedTransaction,
   is_versioned_transaction,
-  BuilderNamespace,
 } from "./wasm/wasm_solana.js";
-import type { RawVersionedTransactionData } from "./builder.js";
 
 /**
  * Address Lookup Table data extracted from versioned transactions.
@@ -98,41 +96,6 @@ export class VersionedTransaction {
     return new VersionedTransaction(wasm);
   }
 
-  /**
-   * Create a versioned transaction from raw MessageV0 data.
-   *
-   * This is used for the `fromVersionedTransactionData()` path where we have
-   * pre-compiled versioned data (indexes + ALT refs). No instruction compilation
-   * is needed - this just constructs the transaction from the raw structure.
-   *
-   * @param data - Raw versioned transaction data
-   * @returns A VersionedTransaction instance
-   *
-   * @example
-   * ```typescript
-   * const tx = VersionedTransaction.fromVersionedData({
-   *   staticAccountKeys: ['pubkey1', 'pubkey2', ...],
-   *   addressLookupTables: [
-   *     { accountKey: 'altPubkey', writableIndexes: [0, 1], readonlyIndexes: [2] }
-   *   ],
-   *   versionedInstructions: [
-   *     { programIdIndex: 0, accountKeyIndexes: [1, 2], data: 'base58EncodedData' }
-   *   ],
-   *   messageHeader: {
-   *     numRequiredSignatures: 1,
-   *     numReadonlySignedAccounts: 0,
-   *     numReadonlyUnsignedAccounts: 3
-   *   },
-   *   recentBlockhash: 'blockhash'
-   * });
-   * ```
-   */
-  static fromVersionedData(data: RawVersionedTransactionData): VersionedTransaction {
-    // Build the transaction using WASM and wrap in TypeScript class
-    const wasm = BuilderNamespace.build_from_versioned_data(data);
-    return VersionedTransaction.fromWasm(wasm);
-  }
-
   /**
    * Check if this is a versioned transaction (MessageV0).
    */