§1 Status: add Implementation status line citing D1 (PR #10c6f4d1b)
and D2 (PR #1123a5696), both 2026-05-08.
§10 Document history: append v1.3-delta closure entry summarising what
D1 and D2 each delivered + what remains as separate operational task
(GlitchTip alert rule configuration in the web UI) and frontend
follow-up (Echo subscription).
No spec changes — purely lifecycle marker update.
Co-Authored-By: Claude Opus 4.7 <noreply@anthropic.com>