fix: remove unused type alias and fix test compatibility with Bun 1.3.11

- Remove unused ParsedChunkTarget type alias (lint error)
- Increase setImmediate timing in history storage compat test
- Mock warmPythonEnvironment in python tool tests
- Fix tlaplus LSP test to spy on $which instead of Bun.which

packages/coding-agent/src/edit/modes/chunk.ts

@@ -88,10 +88,6 @@ export function invalidateChunkCache(filePath: string): void {
 	chunkStateCache.delete(filePath);
 }
 
-type ParsedChunkTarget = {
-	selector: string;
-};
-
 type ChunkSourceContext = {
 	resolvedPath: string;
 	sourceFile: BunFile;