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/db.py

@@ -1,4 +1,5 @@
 import os
+import time
 
 import psycopg
 
@@ -6,3 +7,34 @@ import psycopg
 def connect() -> psycopg.Connection:
     dsn = os.environ["DATABASE_URL"]
     return psycopg.connect(dsn)
+
+
+def wait_for_db(timeout: float = 60.0, interval: float = 2.0) -> psycopg.Connection:
+    """Block until the database is up and the `Job` table exists.
+
+    Repeatedly opens a connection and probes for the `Job` table's presence.
+    Tolerates the DB not being reachable yet (`psycopg.OperationalError`) and
+    migrations not having run yet (`psycopg.errors.UndefinedTable`), retrying
+    with a fixed `interval` until `timeout` elapses. Returns the open, usable
+    connection on success; re-raises the last error on timeout.
+    """
+    deadline = time.monotonic() + timeout
+    printed_waiting = False
+    last_error: Exception | None = None
+    while time.monotonic() < deadline:
+        conn: psycopg.Connection | None = None
+        try:
+            conn = connect()
+            with conn.cursor() as cur:
+                cur.execute('SELECT 1 FROM "Job" LIMIT 0')
+            return conn
+        except (psycopg.OperationalError, psycopg.errors.UndefinedTable) as exc:
+            last_error = exc
+            if conn is not None:
+                conn.close()
+            if not printed_waiting:
+                print("worker: waiting for database schema...", flush=True)
+                printed_waiting = True
+            time.sleep(interval)
+    assert last_error is not None
+    raise last_error