fabric: UTF-8 decoder (DECODE-UTF8)

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Punch list §25 item 4.3.6a complete.
capsules/fabric.4th blocks 4918-4920: UTF8-SEQ-LEN/UTF8-CONT? verbatim
from §27.6.2, DECODE-UTF8 dispatching to four UTF8-ASSEMBLE-N helpers
(1/2/3/4-byte). Factored into helpers after the single-word draft hit
mkcapsule's real 64-char x 16-line block limit. Verified live on
amd64: a 6-byte test buffer (ASCII + deg-sign + em-dash) decoded to
65/176/8212 across three sequential calls, exact match against
hand-computed codepoints, buffer fully consumed. Three-arch acceptance
boot clean, Stadium conservation unaffected.

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

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This commit is contained in:

Robert Allan James

2026-08-09 19:00:36 -04:00

co-authored by Claude Sonnet 5

parent 82e948afe9

commit 24d6b9e20e

13 changed files with 54530 additions and 111 deletions

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logs/20260809-185758/amd64/qemu-amd64-20260809-185758.log

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logs/20260809-185835/aarch64/qemu-aarch64-20260809-185835.log

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logs/20260809-185925/riscv64/qemu-riscv64-20260809-185925.log

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