feat(pm): patrol row H64 — a seat-signed artefact authored by a user account

Maintainer ruling, skills seat chat 2026-09-13T16:14Z, verbatim:
「机制层的五道锁 现在就派发处理」 — this row is lock 5.

Content written through the MCP GitHub tools is authored by a USER account;
content written through the REST proxy is authored by `claude[bot]`. A user
account that is suspended hides everything it authored, so a seat- or
dev-signed artefact under a user login is a half-state: the text says a seat
wrote it, the account field says a person did.

Report-only, zero requests: open card and PR bodies already in hand plus the
card threads H44/H56 read. No new listing, no label, no write path, and no
roster of seat accounts (H44's refusal, taken for H44's reason).

Claude-Session: https://claude.ai/code/session_01DAcomhvR9kKizeYgg89Vo8
Co-authored-by: Claude <noreply@anthropic.com>

Author: claude