docs(D-CMR): Experiment A's i32 arm is a counterexample, not today's fold

[AdaWorldAPI]

Docs only, one paragraph. This commit was pushed to the #1532 branch after #1532's merge snapshot, so it never reached main; this PR lands it.

.claude/plans/d-cmr-concept-chain-normalization-v1.md §7, Experiment A: the eager variant that accumulates into i32 is a deliberate counterexample that shows the loss. It is not a model of today's fold, which accumulates exactly into i64 within the row bound (mask-risc/src/ir.rs:296, :461).

Rebased onto main (2b28a19). No code, no dependency.

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https://claude.ai/code/session_013z2e1YXkm6o6HNrDn5BPWA

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Review	Status	Commit	Review trigger
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