KYAML step 4/6 — decide KYAML scope on the evidence (owner ruling)

[hyperpolymath]

Step 4 of 6 in the KYAML adoption order fixed by 3-practice/YAML-POLICY.adoc §5.
Blocked by #1022.

Work

Decide KYAML scope on the evidence from steps 1–3.

Gate (§5)

An owner ruling recorded as a decision row. Not an inference from the probe.

Why this is its own step

§3.4: the owner considered mandating KYAML estate-wide including workflows and
chose instead to probe workflows first and decide after. The policy therefore
mandates KYAML nowhere today, and nothing in the estate is out of compliance
with Y-3, because Y-3 imposes nothing yet.

⚠ Step 1 (#1020) proved only that GitHub parses KYAML. That is one input to
this decision and explicitly not the decision itself — the §5 gate rules out
inferring scope from the probe.

Acceptance criteria

• Evidence from KYAML step 1/6 — probe whether GitHub Actions parses a KYAML workflow #1020, KYAML step 2/6 — comment-preservation proof (shared by Y-2 and Y-3) #1021 and KYAML step 3/6 — a KYAML formatter/linter for arbitrary YAML #1022 summarised in one place before the ask.
• Put to the owner via the selection UI, with the most elegant/correct
  long-term arm labelled as such.
• Recorded as a decision row on the standing decision surface
  (hyperpolymath/standards#787), appended — never renumbered.
• The ruling states explicitly whether workflows are in scope, since
  step 6 does not start without that.

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