[WS2][PR5][Attention] Add distributed CP drift benchmark artifacts

[inaniloquentee]

Scope

PR6 is the acceptance validator for strict Attention evidence and machine-readable artifacts.

Acceptance contract

Requirement	Validator rule
Core identity	Must be rlkernel.attention.deterministic_core.v1
Schedule	Must be single_batch_single_query_global_kv_blocks
Communication	Must report the production backend and communication autograd
Numerical evidence	Requires zero-drift Out/LSE/dQ/dK/dV evidence and repeat-run equality
Failure policy	Missing provenance, fallback, or global failures rejects the artifact

Validation

Check	Result
Acceptance validator suite	22 passed
H100 production matrix	Passed: all required cases; failed_required_cases=[]

Boundary

This PR validates evidence; it does not manufacture GPU results. The completed H100 artifacts and runtime boundary are recorded in #294.

Commit: f21eee7

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