cuda: compiler_v2 module becomes compiler

The package already exposed it as CelerisLab.cuda.compiler; the module now
has that name and every tip caller, doc and current-tree test imports it
directly (no alias).

Historical-revision tooling is not edited: the Taylor-Green harness
(run_case.py, hash-pinned check_projected_pairs.py, assess receipts) only
runs against a135252, whose package has cuda/compiler_v2.py, and the J
campaign runners and dated docs describe past trees. Its two current-tree
tests now import that package from git (historical_package) instead of the
tip, and the kernel-root test first checks the accepted case.

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>

src/CelerisLab/body/manager.py

@@ -11,7 +11,7 @@ Responsibilities:
 
 Design::
   Packed ``obs`` layout matches ``generate_config(..., n_objects=count)`` and
-  ``config_obs.h`` macros. Host sizing uses :func:`~CelerisLab.cuda.compiler_v2.obs_layout`.
+  ``config_obs.h`` macros. Host sizing uses :func:`~CelerisLab.cuda.compiler.obs_layout`.
 
   Pending edits are lightweight: only the "intent" (add / remove) is stored.
   All derived quantities (flags, compact lists, GPU buffers) are built at
@@ -28,7 +28,7 @@ import pycuda.driver as cuda
 from .objects import SimObject
 from .registry import BodyRegistry
 from .preprocess.flag_overlay import merge_flag_masks, validate_cut_link_ownership
-from ..cuda.compiler_v2 import obs_layout
+from ..cuda.compiler import obs_layout
 from ..cuda.obs_layout import ObsLayout
 from ..lbm.descriptors import (
     FLUID, SOLID,

src/CelerisLab/config.py

@@ -7,7 +7,7 @@ Two JSON files:
   config_body.json – object list
 
 LBMConfig / BodyConfig are plain dataclasses; they translate to
-macro dicts consumed by `cuda/compiler_v2.py` for header generation.
+macro dicts consumed by `cuda/compiler.py` for header generation.
 """
 
 import json

src/CelerisLab/configs/CONFIG.md

@@ -60,14 +60,14 @@ Python `config.py` 只负责读取和校验，不是配置位置。显式配置
 
 **`lbm/kernels/config/*.h` 由编译器根据 `LBMConfig` 自动生成，请勿手改。**
 
-仓库中检入的 `config/*.h` 可能是历史版本。`compiler_v2.generate_config` 会复制 kernel 源码到独立临时构建目录，并在副本中生成配置；不会改写包内头文件或 PTX。返回目录须显式传给 `compile_kernel(build_dir=...)`，编译结果与配置摘要均保存在该目录。`Simulation` 负责目录清理；直接使用编译器的调用者须调用 `cleanup_build_dir()`。跳过生成配置直接编译仓库中的 `uniform.cu` 属不受支持用法。
+仓库中检入的 `config/*.h` 可能是历史版本。`compiler.generate_config` 会复制 kernel 源码到独立临时构建目录，并在副本中生成配置；不会改写包内头文件或 PTX。返回目录须显式传给 `compile_kernel(build_dir=...)`，编译结果与配置摘要均保存在该目录。`Simulation` 负责目录清理；直接使用编译器的调用者须调用 `cleanup_build_dir()`。跳过生成配置直接编译仓库中的 `uniform.cu` 属不受支持用法。
 
 ```
 config_lbm.json
   ↓  load_lbm_config()
 config.py:LBMConfig       (读取 + 校验)
   ↓  to_macros()
-cuda/compiler_v2.py       (独立构建目录中生成 config/*.h)
+cuda/compiler.py          (独立构建目录中生成 config/*.h)
   ↓
 config_grid.h             → NX, NY, NZ, NT, LATTICE_MODEL；
                             DIM / NQ 由 LATTICE_MODEL 推导写入（与 grid.lattice_model 一致，非 JSON 顶层字段）

src/CelerisLab/cuda/__init__.py

@@ -1,4 +1,4 @@
 """CUDA build helpers (compilation itself does not need a live context)."""
-from . import compiler_v2 as compiler
+from . import compiler
 
 __all__ = ["compiler"]

src/CelerisLab/cuda/compiler.py

@@ -1,4 +1,4 @@
-# CelerisLab/cuda/compiler_v2.py
+# CelerisLab/cuda/compiler.py
 """
 Kernel configuration, compilation, and module loading.
 

src/CelerisLab/cuda/obs_layout.py

@@ -2,7 +2,7 @@
 """Packed ``obs`` buffer layout for force / torque / sensor telemetry.
 
 Usage::
-    Host code (e.g. ``ObjectManager``) and ``compiler_v2.generate_config`` must use
+    Host code (e.g. ``ObjectManager``) and ``compiler.generate_config`` must use
     the same ``dim`` and ``n_objects`` so allocation sizes match device macros.
 
 Design::

src/CelerisLab/lbm/block_stepper.py

@@ -17,7 +17,7 @@ from threading import RLock
 import numpy as np
 import pycuda.driver as cuda
 
-from ..cuda import compiler_v2 as compiler
+from ..cuda import compiler
 from .blocks import (NQ, BlockLayout2D, blocked_link_tables, launch_curved_boundary,
                      launch_halo_copy, level_config)
 from .descriptors import D2Q9_EX, D2Q9_EY, FLUID, SOLID

src/CelerisLab/lbm/refinement_stepper.py

@@ -14,7 +14,7 @@ from threading import RLock
 import numpy as np
 import pycuda.driver as cuda
 
-from ..cuda import compiler_v2 as compiler
+from ..cuda import compiler
 from .blocks import BlockLayout2D, launch_curved_boundary, launch_halo_copy, level_config
 from .channel import channel_masks, validate_channel_config, validate_channel_transfers
 from ..body.jets import jet_link_velocity

src/CelerisLab/simulation.py

@@ -25,7 +25,7 @@ import pycuda.driver as cuda
 
 from .config import LBMConfig, BodyConfig, load_lbm_config, load_body_config
 from .cuda.context import CudaContext, context_bound
-from .cuda import compiler_v2 as compiler
+from .cuda import compiler
 from .lbm.field import LBMField
 from .lbm.stepper import LBMStepper
 from .body.objects import SimObject