Regression-check amd64 and riscv64 after aarch64 SMC->HVC fix

Confirms no regressions: 30/30 Artemis stress-campaign reps PASS and
clean BYE exit (no exception) on both architectures. arch.c's SMC->HVC
change was aarch64-only, as expected these were unaffected.

Co-Authored-By: Claude Sonnet 5 <noreply@anthropic.com>

capsules/BLOCK_MAP.md

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+<!-- Generated by mkcapsule --manifest  2026-08-18T22:37:43Z -->
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 <!-- Hand-written justifications and immutability notes live  -->
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