gapfill G3: unify all 5 private row_get onto peer_messages.row_get (approvals, automations, marker_tools, todos, wait_ops; resident import retargeted); semantics identical on None/dict/sqlite3.Row, identity tests added

cloud/marker_tools.py

@@ -139,6 +139,7 @@ from typing import Any
 
 from cloud.gates import RETRYABLE_STATUSES as _GATE_RETRYABLE
 from cloud.gates import TERMINAL_STATUSES as _GATE_TERMINAL
+from cloud.peer_messages import row_get
 from cloud.gates import decide_control as _gate_decide_control
 from cloud.gates import is_goal_task as _gate_is_goal_task
 from cloud.gates import resolve_inside as _gate_resolve_inside
@@ -285,14 +286,6 @@ def parse_first_run_at(value):
     return epoch
 
 
-def row_get(row, name):
-    """与 peer_messages.row_get 同款容错取值。"""
-    try:
-        return row[name]
-    except (KeyError, IndexError, TypeError):
-        return None
-
-
 def _as_int(value, default):
     if isinstance(value, bool):
         return default