docs(adr): ADR-0138 revision — D1 A′ (no platform default owner) and D2b R (publish refusal, both directions)

Applies the ruling supplement 6056614963 (maintainer 「D1 A′ D2b R」):
D1 keeps the invariant (the guest is a principal and never an owner,
a forged owner is refused, attribution is not ownership) and drops the
organization-level default owner; ownership of a guest-written row is
the business scenario's own metadata and the empty state is the owner
left unset, with no publish refusal. D5's shape loses its default-owner
element. D2b is closed as R, a publish refusal with a prescription in
both directions; the four-axis table stays as its reasoning, and M and
the first-drafted default owner move to Alternatives considered. E2
carries R with its registered ADR-0087 semantic entry; E3 shrinks to the
stamp's guest branch with no new key; acceptance criterion 3 is met.

Claude-Session: https://claude.ai/code/session_01LAi5BVvQNiYzepSAcsoFLK
Co-authored-by: Claude <noreply@anthropic.com>

Author: claude