fix: worker waits for schema before claiming; npm ci for reproducible builds

Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>

worker/lyra_worker/main.py

@@ -1,7 +1,7 @@
 import time
 
 from lyra_worker.claim import claim_next
-from lyra_worker.db import connect
+from lyra_worker.db import wait_for_db
 from lyra_worker.pipeline import run_pipeline
 
 IDLE_SLEEP = 2.0
@@ -9,7 +9,7 @@ STAGE_DELAY = 1.0  # visible progress in the UI
 
 
 def run_forever() -> None:
-    conn = connect()
+    conn = wait_for_db()
     print("worker: waiting for jobs", flush=True)
     try:
         while True: