[Runtime][TP2 CP2] Publish strict bitwise runtime and user modes

[inaniloquentee]

Summary

This publishes the complete RL-Kernel side of the Qwen3-8B TP=2, CP=2 strict
train/rollout consistency work on top of the current test branch.

• restores the strict Megatron and vLLM Attention, FFN, collective, and
  linear_logp runtime routes used by the 8xH100 validation;
• keeps every strict Attention, GEMM, FFN, and logprob route fail-closed;
• defaults the aligned Hopper runtime to deterministic cuBLASLt no-split-K
  GEMM while retaining the explicit SM90 backend;
• adds RL_KERNEL_MODE=strict|audit|auto|off as the user-facing integration
  contract;
• reports interface, operator, actual, and fallback once per module on
  rank 0 by default;
• exposes the canonical provider as
  rl_engine.integrations.vime.linear_logp.provider, while keeping the old
  provider path compatible;
• keeps all framework changes in RL-Kernel-owned adapters. No Vime, Megatron,
  or vLLM native source is modified.

The branch was rebuilt from origin/test before publication, so the earlier
local WIP snapshot is not present in the PR history.

8xH100 evidence

Qwen3-8B, TP=2, CP=2, strict aligned R/R:

mismatch_count=0
max_abs_diff=0
torch_equal=true
steady rollout=1.0173s
steady actor=0.8536s
steady step=22.8104s

Artifact directory on the validation host:

/home/ellm/ljj/vime-debug-main/outputs/rlkernel/fair-rr-aligned-cublaslt-20260826T152921Z

Tests

66 passed, 44 skipped

The skipped cases require CUDA. bash -n and git diff --check also pass.

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