feat(esopull): runtime body sync for EsoPull streaming mode

- New esopull_sync.cu: DecodeCellsToPhysical + EncodePhysicalToCells
  (compact-list mode, ddf_shifting-aware, encode applies collision).
- sync_bodies() now branches for double_buffer vs esopull: decode
  backing layout to physical DDF on GPU -> host patch -> collide +
  encode back to backing layout. No temp_gpu, no full-grid copy.
- 4 new integration tests covering esopull add/remove/cycle/roundtrip.
- ddf_shifting + esopull + sync_bodies jointly verified (1300 steps
  stable after add/remove).
- Bump version to 0.5.0.

Co-authored-by: Cursor <cursoragent@cursor.com>

setup.py

@@ -5,7 +5,7 @@ with open("README.md", "r", encoding="utf-8") as fh:
 
 setup(
     name='CelerisLab',
-    version='0.4.0',
+    version='0.5.0',
     author='Frank14f',
     description='GPU-accelerated Lattice Boltzmann Method (LBM) CFD solver using CUDA',
     long_description=long_description,