docs: drop the Cursor rule of the removed panel-ui mockups

.cursor/rules/panel-ui-system.mdc named docs/assets/panel-ui the source of
truth for mockups; that folder is gone (6099716) and the redesign's rule
(.cursor/rules/panel-design.mdc) is the one in force. The two plans that
mention the removed folders say they were removed.

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>

.cursor/rules/panel-ui-system.mdc

@@ -1,22 +0,0 @@
----
-description: Panel UI mockups use the design system primitives, not a reskin of live templates.
-globs: docs/assets/panel-ui/**
-alwaysApply: false
----
-
-# Panel UI system
-
-Source of truth: [docs/assets/panel-ui/system.html](docs/assets/panel-ui/system.html) and `system.css`.
-
-Do not copy `internal/web/view/templates` into mockups. Do not mark `<main>` as `ops`/`form` to pick width. Do not fix empty columns, Host/Type height, or split Save/Delete with one-off CSS.
-
-Compose screens from `stack`, `pair`, `measure`, `fill`, `field-row`, `actions-row`:
-- Two peer jobs → `pair` (one child shrinks to `measure`).
-- Tables/logs/DNS → `fill` (nowrap + overflow-x on the card). Add-to-list is a `measure` row inside that card, not a second card above it.
-- Confirm/login/user form → `measure`.
-- Host ‖ Type and two equal inputs → `field-row` (shared grid row, not two `.code` paddings).
-- Save + Delete → `actions-row` inside the card; never submit inside `<form>` and danger after `</form>`.
-- Danger zone is the second column of the last `pair`, never a full-width `fill`.
-- Card chrome is title + optional `?` + body + actions. Help is not sprinkled later.
-- Phone: `pair` stacks; `field-row` does not; tables become lists.
-- One screen is one HTML file. Shared chrome is `shell.js`. Do not put every screen in one hash-SPA.

docs/plans/inbound-antispam-panel.md

@@ -193,7 +193,7 @@ Filter lists** page (global-only: the lists are instance-wide) — see
 [panel-redesign.md](panel-redesign.md) § Room for roadmap items. The journal
 table has filters (decision, domain, date range). Mockups are drawn first, in
 `docs/assets/panel-redesign/panel/src/` under that plan's design contract —
-not in the superseded `docs/assets/panel-ui/`.
+not in the superseded `docs/assets/panel-ui/` (removed 2026-10-16).
 
 ## Schema (migration `0002_inbound_spam_log.sql`, the first after the 2.0 baseline)
 

docs/plans/panel-redesign.md

@@ -24,7 +24,8 @@ When an implementation and a mockup disagree, the implementation is wrong.
 
 The 2026-09-08 givens ("no component library, Web Awesome layout CSS only") are
 withdrawn. `docs/assets/panel-ui/` and the stage-1 directions `a/`, `b/`, `c/`
-are history, not a brief.
+were history, not a brief, and were removed on 2026-10-16 (`6099716`; they
+are in the git history).
 
 ## Goal