feat(s1p2): add inotify-based filesystem write detection with external conflict tracking

v2/src/lib/adapters/fs-watcher-bridge.ts

@@ -0,0 +1,28 @@
+// Filesystem watcher bridge — listens for inotify-based write events from Rust
+// Part of S-1 Phase 2: real-time filesystem write detection
+
+import { invoke } from '@tauri-apps/api/core';
+import { listen, type UnlistenFn } from '@tauri-apps/api/event';
+
+export interface FsWriteEvent {
+  project_id: string;
+  file_path: string;
+  timestamp_ms: number;
+}
+
+/** Start watching a project's CWD for filesystem writes */
+export function fsWatchProject(projectId: string, cwd: string): Promise<void> {
+  return invoke('fs_watch_project', { projectId, cwd });
+}
+
+/** Stop watching a project's CWD */
+export function fsUnwatchProject(projectId: string): Promise<void> {
+  return invoke('fs_unwatch_project', { projectId });
+}
+
+/** Listen for filesystem write events from all watched projects */
+export function onFsWriteDetected(
+  callback: (event: FsWriteEvent) => void,
+): Promise<UnlistenFn> {
+  return listen<FsWriteEvent>('fs-write-detected', (e) => callback(e.payload));
+}