feat(watchers): add Rust-powered watcher backend with runtime fallback and cross-platform test coverage

ts/watchers/watcher.deno.ts

@@ -218,6 +218,30 @@ export class DenoWatcher implements IWatcher {
           type: wasDirectory ? 'unlinkDir' : 'unlink',
           path: filePath
         });
+      } else if (kind === 'any' || kind === 'other') {
+        // Deno may emit 'any' for various operations — determine the actual type
+        const stats = await this.statSafe(filePath);
+        if (stats) {
+          if (this.watchedFiles.has(filePath)) {
+            // Known file → treat as change
+            if (!stats.isDirectory()) {
+              this.events$.next({ type: 'change', path: filePath, stats });
+            }
+          } else {
+            // New file → treat as add
+            this.watchedFiles.add(filePath);
+            const eventType: TWatchEventType = stats.isDirectory() ? 'addDir' : 'add';
+            this.events$.next({ type: eventType, path: filePath, stats });
+          }
+        } else {
+          // File no longer exists → treat as remove
+          const wasDirectory = this.isKnownDirectory(filePath);
+          this.watchedFiles.delete(filePath);
+          this.events$.next({
+            type: wasDirectory ? 'unlinkDir' : 'unlink',
+            path: filePath
+          });
+        }
       }
     } catch (error: any) {
       this.events$.next({ type: 'error', path: filePath, error });