Function createSingleBlockLayout

createSingleBlockLayout(
fileBytes: Uint8Array,
): Promise<Uint8Array<ArrayBufferLike>>
Creates a single-block RaptorQ layout from file bytes.

This function generates a deterministic RaptorQ layout suitable for encoding the provided file data into a single source block. The layout is computed by the rq-wasm library and includes all parameters needed for encoding and decoding.
Parameters
- fileBytes: Uint8Array
  The complete file content as a Uint8Array
Returns Promise<Uint8Array<ArrayBufferLike>>
A promise that resolves to the raw layout file bytes (JSON format)
Throws
If the WASM module fails to initialize or layout creation fails
Remarks
- The layout generation is deterministic: identical input always produces identical output
- This is critical for LEP-1 compliance and data integrity verification
- The layout bytes are what should be signed for LEP-1 compliance
- Use parseLayoutFile() to parse the bytes into a Layout object if needed for verification
Example
```
const fileData = new TextEncoder().encode('Hello, Lumera!');
const layoutBytes = await createSingleBlockLayout(fileData);

// Parse if needed for verification
const layout = parseLayoutFile(layoutBytes);
console.log('Transfer length:', layout.transfer_length);
console.log('Symbol size:', layout.symbol_size);
```
- Defined in src/wasm/lep1.ts:47