Add or extend operators in edge-fm using the current layer + operators + operator_impl_table design. Use when Codex needs to add a new operator implementation (`impl_id`) to an existing op kind, introduce a new `op_kind` and layer pair, update the 最优算子表 / `operator_impl_table`, wire operator selection by `model_name`, `hw_profile`, `layer_role`, `op_name`, `stage`, or `shape_sig`, update CMake or pybind touchpoints, or keep Horizon `graph_tuning` aligned with the operator changes.
Add or extend operators in edge-fm using the current layer + operators + operator_impl_table design. Use when Codex needs to add a new operator implementation (`impl_id`) to an existing op kind, introduce a new `op_kind` and layer pair, update the 最优算子表 / `operator_impl_table`, wire operator selection by `model_name`, `hw_profile`, `layer_role`, `op_name`, `stage`, or `shape_sig`, update CMake or pybind touchpoints, or keep Horizon `graph_tuning` aligned with the operator changes.
edge-fm 新增算子
按当前仓库分层工作：layers/ 负责输入输出契约、校验和 OperatorQuery 构造，operators/ 负责接口、实现和 registry，operator_impl_table 负责按模型、硬件、阶段和形状选择最优实现。新增算子时，先判断是“给现有 op kind 增加一个 impl”，还是“新增一个 op kind + layer 边界”。
