docs(website): document the seed command, with cast (ADR-0048)

New Reference page "Generating sample data" (captured output + a
two-table seed cast showing generation, FK sampling context, and a
`set` override); cross-links from inserting-and-editing-data and
columns; seed added to the rdbms highlight grammar;
querying/sql-queries renumbered. Cast stance in STYLE.md revised to
"justify the absence". Refs #33, #34.

website/casts-src/casts.mjs

@@ -78,6 +78,42 @@ export const casts = [
       { key: 'CtrlC' }, // quit invisibly (Ctrl-C) — cast ends on the last content frame
     ],
   },
+  {
+    name: 'seed',
+    title: 'Fill a table with realistic, ready-to-query data in one command',
+    width: 90,
+    // Two seeds: a people table (`name` → real names, `joined` → recent dates,
+    // which seed nails today) and a tickets table that mixes a free-text column
+    // (`subject`), an auto-detected `priority` (short once #34 lands — until
+    // then a fresh recording fills it with placeholder text), and a `status`
+    // pinned via `set status in (...)` to show the override clause. Re-record
+    // in the final sweep once #34 is in.
+    height: 28,
+    typeSpeed: '45ms',
+    steps: [
+      { wait: 1000 },
+      // A people table — seed reads the column names to choose what to make.
+      { type: 'create table members with pk member_id(serial)', after: 650 },
+      { type: 'add column to members: name (text)', after: 650 },
+      { type: 'add column to members: joined (date)', after: 800 },
+      // The payoff: one line, eight believable rows. Split type + Enter so the
+      // command reads before the table lands.
+      { type: 'seed members 8', enter: false, after: 1500 },
+      { key: 'Enter', after: 2800 },
+      { caption: 'One line fills a table with realistic, ready-to-query data.', after: 3000 },
+      // A second table: a free-text column (`subject`), an auto-detected one
+      // (`priority`), and `status` pinned to a value set with `set`.
+      { type: 'create table tickets with pk ticket_id(serial)', after: 650 },
+      { type: 'add column to tickets: subject (text)', after: 650 },
+      { type: 'add column to tickets: status (text)', after: 650 },
+      { type: 'add column to tickets: priority (text)', after: 800 },
+      // `subject` and `priority` are generated; `status` is pinned to a set.
+      { type: "seed tickets 8 set status in ('open', 'pending', 'closed')", enter: false, after: 1600 },
+      { key: 'Enter', after: 2800 },
+      { caption: 'Generate most columns — and pin one to your own values with set.', after: 3000 },
+      { key: 'CtrlC' }, // quit invisibly (Ctrl-C) — cast ends on the last content frame
+    ],
+  },
   {
     name: 'projects',
     title: 'Save a project, start fresh, then load it back',