kernels: name compilation entries by storage route (uniform.cu, blocked.cu)

kernel_v2.cu -> uniform.cu (whole-domain NX/NY, Simulation) and
blocks.cu -> blocked.cu (one block window, every blocked level), with
InitTubeFlow_v2 -> InitTubeFlow. All live callers, include comments,
CONFIG.md, lifecycle doc and current-tree tests move together; no alias.
refinement.cu keeps its name until the dense-route decision.
Historical-revision tooling that names the old files (LES source pins,
timing/J campaign runners, TG run_case, supported_settings citations at
888c8038, development notes) is unchanged on purpose.
No arithmetic change; the PTX symbol InitTubeFlow_v2 is renamed.

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

tests/validation/multigrid/channel_parity_diagnostic/replay.py

@@ -30,7 +30,7 @@ original_module = gate.compile_module
 cache = {}
 def retain_compile(*args, **kwargs):
     result = original_compile(*args, **kwargs)
-    source = kwargs.get('source', 'kernel_v2.cu')
+    source = kwargs.get('source', 'uniform.cu')
     shutil.copyfile(result, a.output / (Path(source).stem + '.ptx'))
     metadata = Path(result + '.json')
     if metadata.exists(): shutil.copyfile(metadata, a.output / (Path(source).stem + '.ptx.json'))