[TRTLLM-14846][chore] Group KV Cache managers and reunite the Disaggregation transceiver halves

[lori-ren]

…egation transceiver halves

Dev Engineer Review

• Relocated KV-cache managers to _torch/pyexecutor/kv_cache/.
• Consolidated disaggregation transceiver modules under _torch/disaggregation/.
• Updated imports and preserved deferred-import and module-cycle behavior.
• Added recompute-pause handling to KVCacheV2Scheduler.
• Added cold-tier statistics aggregation and KV-cache budget-splitting support.
• Added Minimax M3 sparse-attention validation and FP8 index-cache support.
• Updated Helix context-parallel KV-size accounting.
• Updated CODEOWNERS, legacy-file lists, Ruff configuration, and test paths.
• No apparent correctness, performance, API, error-handling, or ownership regressions.
• Verdict: sufficient.

QA Engineer Review

• Added or restored tests for:
  • AsyncTransferManager transfers and state handling.
  • Disaggregated benchmark scheduling and transfer behavior.
  • Early IndexMapper slot release.
  • KV-cache block-offset overlap handling.
  • KV-cache budget splitting and cold-tier statistics.
  • KV-cache pool rebalancing.
• Updated affected test imports, patch targets, and test paths.
• Updated tests/integration/test_lists/test-db/l0_a10.yml.
• Added unittest/_torch/disaggregation to:
  • l0_b300.yml
  • l0_cpu.yml
  • l0_dgx_b300.yml
  • l0_gb300_multi_gpus.yml
  • l0_h100.yml
• Updated tests/integration/defs/.test_durations and waives.txt.
• The disaggregation tests are included in CI test lists. Specific coverage for all newly added KV-cache tests is not confirmed.
• CBTS coverage data is unavailable.
• Verdict: needs follow-up.

Description

Pure relocation — no production code changed, only import paths.

from	to
_torch/pyexecutor/kv_cache_manager_v2.py	_torch/pyexecutor/kv_cache/kv_cache_manager_v2.py
_torch/pyexecutor/mamba_cache_manager.py	_torch/pyexecutor/kv_cache/mamba_cache_manager.py
_torch/pyexecutor/kv_cache_transceiver.py	_torch/disaggregation/kv_cache_transceiver.py
_torch/disaggregation/transceiver.py	_torch/disaggregation/transceiver_v2.py

New package _torch/pyexecutor/kv_cache/ groups the two KV cache managers. The
transceiver's two halves — the KvCacheTransceiver interface plus factory, and the
KvCacheTransceiverV2 implementation — now sit in one package, and the file names
distinguish them. The factory's deferred import is kept verbatim: the two modules still
form a cycle, and package membership does not change the module graph.

CODEOWNERS: two exact-file rules for kv_cache_transceiver.py retire (the file now falls
under the _torch/disaggregation directory rule); the KV cache rules collapse into one
pyexecutor/kv_cache directory rule. No file changes owner.

The second commit moves the matching tests so they sit with the modules they cover — 13
to tests/unittest/_torch/executor/kv_cache/, 4 to tests/unittest/_torch/disaggregation/
— along with the CODEOWNERS rules and test-list entries that name them.

Test Coverage

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