remove SharedArrayBuffer worker pool (SAB-specific, belongs on feature branch)

- delete crate/src/worker-entry.js and crate/webpack.worker.config.js
- delete src/workerPool.ts, src/workerPoolClient.ts, src/workerPoolHost.ts
- delete src/wasm/bgzf-worker-inlined.js, src/wasm/bgzf-worker-source.ts
- remove dead code from src/unzip.ts (assembleChunkSliceResult, unused imports)

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

Author: cmdcolin

crate/src/worker-entry.js

@@ -1,7 +1,5 @@
 import { ungzip } from 'pako-esm2'
 
-import { type BgzfBlockInfo } from './bgzfBlockScan.ts'
-import { concatUint8Array } from './util.ts'
 import {
   decompressAll,
   decompressChunkSlice,
@@ -72,51 +70,6 @@ export async function unzip(inputData: Uint8Array) {
   }
 }
 
-function assembleChunkSliceResult(
-  decompressedBlocks: Uint8Array[],
-  blockInfos: BgzfBlockInfo[],
-  minv: VirtualOffset,
-  maxv: VirtualOffset,
-) {
-  const cpositions: number[] = []
-  const dpositions: number[] = []
-  const slices: Uint8Array[] = []
-  let dpos = minv.dataPosition
-
-  for (let i = 0; i < decompressedBlocks.length; i++) {
-    const block = decompressedBlocks[i]!
-    const info = blockInfos[i]!
-    const isFirst = i === 0
-    const isLast = info.filePosition >= maxv.blockPosition
-
-    cpositions.push(info.filePosition)
-    dpositions.push(dpos)
-
-    const start = isFirst ? minv.dataPosition : 0
-    const end = isLast
-      ? Math.min(maxv.dataPosition + 1, block.length)
-      : block.length
-
-    if (start < end) {
-      slices.push(block.subarray(start, end))
-    }
-
-    dpos += block.length - start
-
-    if (isLast) {
-      cpositions.push(info.filePosition + info.compressedSize)
-      dpositions.push(dpos)
-      break
-    }
-  }
-
-  return {
-    buffer: concatUint8Array(slices),
-    cpositions,
-    dpositions,
-  }
-}
-
 export async function unzipChunkSlice(inputData: Uint8Array, chunk: Chunk) {
   const { minv, maxv } = chunk
   try {