Files
zeekay 66828f0725 parallel: drop GPU-prefixed duplicates, consolidate into base modules
The core/parallel and dag packages had _gpu.go variants alongside
base implementations. Decomplect: GPU dispatch is a backend, not a
package — moved to runtime selection inside engine.go / hasher.go /
conflicts.go. Drops:
  - core/parallel/engine_gpu.go (folded into engine.go)
  - core/parallel/gpu_hasher.go + gpu_hasher_test.go (folded into hasher.go)
  - dag/conflicts_gpu.go (folded into conflicts.go + conflicts_cpu.go)

Also: cleanup of .bak test files, .! Finder temp files gitignored,
go.mod + go.sum merged from upstream.
2026-05-21 00:42:01 -07:00
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