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

test/test.inode.ts

@@ -1,6 +1,5 @@
 import { tap, expect } from '@git.zone/tstest/tapbundle';
 import * as smartwatch from '../ts/index.js';
-import * as smartfile from '@push.rocks/smartfile';
 import * as smartrx from '@push.rocks/smartrx';
 
 import * as fs from 'fs';
@@ -63,7 +62,7 @@ tap.test('should detect delete+recreate as change event (atomic handling)', asyn
   await delay(100);
 
   // Create initial file
-  await smartfile.memory.toFs('initial content', testFile);
+  await fs.promises.writeFile(testFile, 'initial content');
   await delay(300);
 
   // Get the initial inode
@@ -77,7 +76,7 @@ tap.test('should detect delete+recreate as change event (atomic handling)', asyn
 
   // Delete and recreate (this creates a new inode)
   await fs.promises.unlink(testFile);
-  await smartfile.memory.toFs('recreated content', testFile);
+  await fs.promises.writeFile(testFile, 'recreated content');
 
   // Check inode changed
   const newStats = await fs.promises.stat(testFile);
@@ -103,17 +102,24 @@ tap.test('should detect atomic write pattern (temp file + rename)', async () =>
   const tempFile = path.join(TEST_DIR, 'atomic-test.txt.tmp.12345');
 
   // Create initial file
-  await smartfile.memory.toFs('initial content', testFile);
+  await fs.promises.writeFile(testFile, 'initial content');
   await delay(300);
 
+  // Listen for both change and add events — different watcher backends
+  // may report a rename-over-existing as either a change or an add
   const changeObservable = await testSmartwatch.getObservableFor('change');
-  const eventPromise = waitForFileEvent(changeObservable, 'atomic-test.txt', 3000);
+  const addObservable = await testSmartwatch.getObservableFor('add');
+
+  const eventPromise = Promise.race([
+    waitForFileEvent(changeObservable, 'atomic-test.txt', 3000),
+    waitForFileEvent(addObservable, 'atomic-test.txt', 3000),
+  ]);
 
   // Atomic write: create temp file then rename
-  await smartfile.memory.toFs('atomic content', tempFile);
+  await fs.promises.writeFile(tempFile, 'atomic content');
   await fs.promises.rename(tempFile, testFile);
 
-  // Should detect the change to the target file
+  // Should detect the event on the target file
   const [filePath] = await eventPromise;
   expect(filePath).toInclude('atomic-test.txt');
   expect(filePath).not.toInclude('.tmp.');