feat(observabilidade): watcher chokidar incremental

api/scripts/sessions-indexer.ts

@@ -9,7 +9,7 @@
  * Env:
  *   OBSERVABILIDADE_DB  Override ao caminho da BD SQLite
  */
-import { indexAll, DEFAULT_DB_PATH } from '../services/sessions/indexer.js'
+import { indexAll, DEFAULT_DB_PATH, PROJECTS_ROOT } from '../services/sessions/indexer.js'
 import { startWatcher } from '../services/sessions/watcher.js'
 
 async function main(): Promise<void> {
@@ -24,11 +24,10 @@ async function main(): Promise<void> {
   console.log(`[indexer] modo=${mode} db=${dbPath}`)
 
   if (mode === '--watch') {
-    console.log(`[indexer] watch mode em ${dbPath}`)
+    console.log(`[indexer] watch mode em ${PROJECTS_ROOT} -> ${dbPath}`)
     await indexAll({ dbPath })
     await startWatcher(dbPath)
-    console.log('[indexer] watcher ainda não implementado (ver Task 8) — saída limpa')
-    process.exit(0)
+    return
   }
 
   const start = Date.now()