fix(dev): consolidate generated cache directories

packages/dev-server/src/cache.ts

@@ -1,5 +1,5 @@
-import { existsSync, rmSync } from "node:fs";
-import { resolve } from "node:path";
+import { existsSync, readdirSync, rmSync } from "node:fs";
+import { join, resolve } from "node:path";
 
 export interface ResetDevCacheOptions {
   rootDir?: string;
@@ -7,6 +7,19 @@ export interface ResetDevCacheOptions {
   enabled?: boolean;
 }
 
+function removeLegacyProcessCaches(rootDir: string): void {
+  if (!existsSync(rootDir)) return;
+  for (const entry of readdirSync(rootDir, { withFileTypes: true })) {
+    if (!entry.isDirectory() || !/^\.wrnexus-\d+$/.test(entry.name)) continue;
+    rmSync(join(rootDir, entry.name), {
+      recursive: true,
+      force: true,
+      maxRetries: 3,
+      retryDelay: 100,
+    });
+  }
+}
+
 export function resetDevCache(options: ResetDevCacheOptions = {}): string {
   const rootDir = resolve(options.rootDir ?? process.cwd());
 
@@ -16,6 +29,8 @@ export function resetDevCache(options: ResetDevCacheOptions = {}): string {
     return cacheDir;
   }
 
+  removeLegacyProcessCaches(rootDir);
+
   // Safety: never allow deleting the project root.
   if (cacheDir === rootDir) {
     throw new Error("Refusing to remove the project root as the WRNexus cache directory.");