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/unit/test_build_contracts.py

@@ -168,7 +168,7 @@ class BuildContracts(unittest.TestCase):
                 with self.assertRaises(subprocess.CalledProcessError):
                     compiler.compile_kernel(build_dir=build)
             self.assertEqual(Path(previous).read_bytes(), old_bytes)
-            self.assertEqual(sorted(Path(build).glob("kernel_v2-*.ptx")), [])  # no partial output
+            self.assertEqual(sorted(Path(build).glob("uniform-*.ptx")), [])  # no partial output
             compiler.cleanup_build_dir(build)