Zijie Tian 690456dbf9 ♻️ refactor: create ops module and move chunked_attention ...

- Create nanovllm/ops/ module for low-level attention operators
- Move chunked_attention.py from kvcache/ to ops/
- Update imports in full_policy.py (3 locations)
- Fix: remove dead code in OffloadEngine.reset() referencing
  non-existent layer_k/v_buffer_a/b attributes

Verified with needle test (32K offload): PASSED

Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>

2026-01-20 02:50:14 +08:00

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