eval: fold GEMM/allreduce harnesses into self-contained milestone benches

Move the GEMM + allreduce sweep/render logic out of scripts/ and tests/
into two self-contained eval benches so a user can regenerate every
result + figure with one command:

  kernbench run --bench milestone-1h-gemm   (MILESTONE_FAST=1 reuses JSON)
  kernbench run --bench milestone-1h-ccl

- benches/milestone_1h_{gemm,ccl}.py: single home for each domain; the
  run(torch) entry drives the sweeps and writes figures into
  benches/1H_milestone_output/{gemm,ccl}/ (gitignored), then submits a
  sentinel tensor to satisfy the run_bench contract.
- tests/gemm + tests/sccl helpers and scripts/gemm_sweep.py become thin
  re-export/wrapper shims over the benches (single source preserved); the
  pytest-only param builders + _run_distributed wrapper stay in the shim.
- eval-bench pattern: a bench may drive many configs + build its own
  per-config engines (extends ADR-0045 D5; reverses ADR-0044 D1/D2).

ADR-0054 (EN+KO) records the design; ADR-0043/0044/0045 + CLAUDE.md CLI
Semantics amended; ADR INDEX regenerated. Verified: milestone benches run
clean (ok=True, all artifacts), full suite 67 passed, lang-pairs OK.

Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>

docs/adr/ADR-0043-eval-allreduce-harness.md

@@ -7,6 +7,11 @@ Accepted
 Documents the `tests/sccl/` evaluation harness; verified against the
 implementation (constants, file set, and sweep dimensions cross-checked).
 
+**Amended by ADR-0054**: the driver core, sweeps, and renderers moved into
+the `milestone-1h-ccl` bench (single home); `tests/sccl/_allreduce_helpers.py`
+now re-exports from it (keeping the pytest-only param builders +
+`_run_distributed` wrapper local). The figure tests are unchanged.
+
 ## Context
 
 ADR-0032 defines the intercube all-reduce *algorithm*; ADR-0023/0024/0027