Switch off riscv.Spacing: it flags wrapped indented lists

[Bill Traynor (wmat)]

Vale currently fails on this repository's own content — see actions runs
37369566605
and
37369902949.

riscv.Spacing wants exactly one space between words and reports any run of
whitespace after a full stop. But Vale lints the Asciidoctor-converted text,
where a line break plus a list item's continuation indent collapses into several
spaces. Ordinary wrapped prose inside an indented list is therefore flagged even
though nobody typed a double space:

README.adoc 46:85   'Actions.    Do'
README.adoc 47:180  'behind.    The'
README.adoc 48:410  'intervention.    Set'
README.adoc 49:424  'recur.    Pages'
modules/ROOT/pages/chapter2.adoc 60:44  'site.   Diam'

All five are false positives. The README hits are the numbered Repository
Setup Checklist, where each continuation line is indented three spaces as
AsciiDoc requires; the chapter2.adoc hit is in the sample spec content. Any
adopting repository with a wrapped indented list reproduces this.

Why it looks intermittent

The reusable workflow runs reviewdog with --filter-mode=diff_context, so a
pre-existing hit surfaces only when a push's diff happens to cover it. Pushes to
main on 2026-10-05 passed at 15:08 and 15:36 and failed at 20:24 with
README.adoc untouched since 2026-09-30. A gate that fires on unrelated pushes
is worse than one that fires consistently.

Change

Switch the rule off alongside riscv.Slash and riscv.SentenceLength, which
are disabled for the same reason, and document why so nobody re-enables it
without re-reading the rationale. Repositories that normalise their prose to
single spacing can turn it back on — the file already documents the rule
disables as the adopting repository's own.

riscv/riscv-high-assurance-cryptography reached the same conclusion
independently while adopting this config: the rule fired 242 times there, 50 of
them on dotted notation (DSA.KeyGen, KEM.Encaps, SFENCE.VMA) read as a
sentence boundary.

Verification

Vale 3.23.0 using the workflow's own invocation
(--minAlertLevel=error --glob='*.adoc'): 5 errors before, 0 after, across 9
files. All five were riscv.Spacing, so nothing else is masked.

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