FABRIC-3.6.md task 0.0: three-ISA baseline smoke test, PASS

amd64/aarch64/riscv64 all boot clean to [zuse@Hera] ok>, zero UNKNOWN
WORD, and dict_hash identical across all three: Hera (PARITY:M7.1a)
0x6824fe5993239838, Hermes 0x062252c4da6858da, Artemis
0xed80117724c26f36. This is the gate task 0.0 exists for -- every later
task's acceptance in this document assumes this baseline is known-good.

Found and worked around a real confound along the way: disk/artemis.img
is deliberately shared across all three ISAs' qemu targets (FABRIC-3.md
SXXXV.2), so a same-order rerun has run 2 and 3 silently resume run 1's
already-formatted disk instead of formatting their own. The first
attempt (logs/20260919-124835 amd64, logs/20260919-124952 aarch64,
both kept for the record) shows exactly this: Artemis's dict_hash
diverges between the two runs even though Hera's and Hermes's do not,
because only Artemis's birth path branches on disk state. Restored
disk/artemis.img and disk/thumbdrives/zuse-thumb-ident.img to their
committed blank state before each of the three reruns that produced
the clean, matching baseline above, and recorded the finding in
FABRIC-3.6.md so a later task doesn't mistake the same confound for a
real architecture divergence.

capsules/BLOCK_MAP.md's timestamp header is regenerated by the build,
per .claude/CLAUDE.md's documented behavior for that generated file.

Authorized by Captain Bob ("begin", "clean new disk",
"document, commit, and push").

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

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