Revert "perf(deepseek): reduce fused MTP decode host transfers"

[ndleslx]

Reverts #144.

#144 (perf(deepseek): reduce fused MTP decode host transfers, commit
0ae4fd85) broke the DeepSeek V4 accuracy guard on main:

• Its merge run
  (32468071303)
  failed unit-tests on
  tests/test_deepseek_v4_http_completion_matches_expected_text[k1-prefix-cache]
  — an accuracy mismatch, the generated text diverging from the expected
  completion mid-generation.
• The previous merge on main (feat(skill): add aligned DSV4 GBS32 profiler #170,
  32462006878)
  was green 80 minutes earlier, and nothing landed in between.
• Both runs resolved the identical pypto revision — pypto under test: 5b15048e836c574238acde135466740c10bf5239 appears in each log — so ptoas and
  the pto-isa commit (read from that same checkout) were the same as well. The
  toolchain is held constant; the only delta between green and red is perf(deepseek): reduce fused MTP decode host transfers #144
  itself.

That is the path #144 changed: the fused MTP decode in
npu_runner.py / task_args.py now keeps outputs device-resident, and the
k1-prefix-cache variant is exactly the configuration that exercises it with a
cached prefix.

Verified locally: the reverted tree passes all 82 tests in
tests/unit/model/deepseek/test_model_components.py, plus the repo's lint
checks. The full unit-tests job — including that DeepSeek guard — runs on this
PR and should confirm main goes green again.

The perf idea is worth relanding once it can pass the accuracy guard.

[coderabbitai]

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