docs(website): update seed (year + choice-sets) and readline keys for the merge

Seed page reflects #33/#34: year-as-int columns, built-in value sets
(priority/severity/rating), advisory now status-only; output blocks
re-captured and the seed cast re-recorded. Assistive-editor documents
the #29 readline shortcuts (Ctrl-A/E/W/K/U, Esc) and #30 cross-mode
history recall; multi-line stays the only planned item.

website/src/content/docs/using-the-playground/the-assistive-editor.mdx

@@ -49,14 +49,24 @@ lists options and `help` lists commands.
 
 Move and edit within the line with the usual keys: <kbd>←</kbd>/<kbd>→</kbd>
 by character, <kbd>Home</kbd>/<kbd>End</kbd> to the ends, and
-<kbd>Delete</kbd>/<kbd>Backspace</kbd> to remove characters. Your
-project-scoped command history is available with <kbd>↑</kbd>/<kbd>↓</kbd>.
+<kbd>Delete</kbd>/<kbd>Backspace</kbd> to remove characters. Readline-style
+shortcuts work too: <kbd>Ctrl</kbd>+<kbd>A</kbd> / <kbd>Ctrl</kbd>+<kbd>E</kbd>
+jump to the start / end of the line, <kbd>Ctrl</kbd>+<kbd>W</kbd> deletes the
+word before the cursor, <kbd>Ctrl</kbd>+<kbd>K</kbd> clears from the cursor to
+the end of the line, <kbd>Ctrl</kbd>+<kbd>U</kbd> clears from the start to the
+cursor, and <kbd>Esc</kbd> clears the whole line at once (or, right after you
+accept a completion, undoes that first).
+
+Your project-scoped command history is available with <kbd>↑</kbd>/<kbd>↓</kbd>.
+If you recall an advanced-mode (SQL) command while you are in simple mode, it
+comes back with a leading `:` — the [one-line escape to advanced
+mode](/getting-started/modes/) — so it still runs exactly as you typed it.
 
 A long command does not get cut off: the line scrolls sideways to keep the
 cursor in view, and on a tall terminal the input field uses two rows so you
 can see more of it at once.
 
 :::note[Planned]
-Multi-line entry and extra readline-style shortcuts (Ctrl-A/E/W/K/U) are
-planned and not yet available.
+Multi-line entry — <kbd>Enter</kbd> inserting a newline, with a separate key to
+submit — is planned and not yet available.
 :::