Suffix vocabulary for the retained kernel surface (accumulating ops and _view)

[shinaoka]

Scope correction (2026-08-10)

strided-einsum2 and strided-opteinsum are not being retired. Per #226, all nine workspace crates remain maintained. Any retirement/Phase 2 removal premise below is obsolete; re-audit and implement the acceptance criteria across the maintained workspace.

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Part of #199 (Phase 3, API). All file:line references are pinned to origin/main at 9da9b9f. Decision issue; record the outcome in REPOSITORY_RULES.md, then rename without compatibility shims (pre-1.0 policy).

Because einsum2 remains maintained, its beta-carrying _into entry points must be included in the vocabulary decision. The workspace surface is inconsistent:

• add / mul / axpy / fma (ops_view.rs:254, :355, :456, :562) are unsuffixed read-modify-write ops (dest[i] += ..., dest[i] *= ...), and axpy_raw / axpy_conj_raw likewise; all are facade-root exports.

• mul (dest *= src) vs mul_into (dest = a * b, map_view.rs:1713) are different operations under a name pair suggesting the same op.

• copy_scale / copy_conj (ops_view.rs:857, :872) are pure overwrites missing _into while copy_into / copy_transpose_scale_into carry it.

• _view means metadata-only exactly once (diagonal_view) while permute / broadcast / transpose_2d / conj are metadata-only without it, and *_view.rs module names mean "operates on views".

• _uninit coverage is asymmetric: ErasedCopyPlan lacks execute_uninit (typed CopyPlan has it), gather-family typed execute_uninit is pub(crate) while the erased ones are public, and map_into / zip_map* / copy_into / reduce* have no uninit siblings.

• Decide: adopt the tenferro vocabulary (_add_to for accumulation, _into strictly overwrite, one _view meaning) or document a strided-specific convention.

• Rename and close the _uninit coverage gaps accordingly.

[shinaoka]

2026-08-10 棚卸し

active decision, early in sequence。全9 crate 維持により「einsum2 suffix が消える」前提は撤回されたため、surface 全体を再棚卸しする。推奨は _into=overwrite、_add_to 等=accumulate、_view=metadata-only に統一し、pre-1.0 なので互換 shim なし。決定を rules に記録後、rename、facade re-export、docs/examples/tests を同じ系列で更新する。

Umbrella: #230。実装 PR の base は umbrella/issue-burndown-2026-08。