[ctoth]

When the MOO asks you to pick from a menu ($command_utils:menu, $menu_utils:menu), the client now shows the choices as a list where the input line was, instead of a numbered list you answer by typing.

• New MCP package world.mongoose.menu (Mongoose's own, beside world.mongoose.location): prompt, plus parallel multiline options* and responses*. An empty response is a text line (a heading), not a choice. The MOO sends it only to clients that negotiated the package; everyone else still gets the numbered text menu.
• The choice goes back as an ordinary input line, the same thing a player would type, so the MOO's read() is unchanged. It is sent with sendCommand(line, { answer: true }) so autosay never turns "2" into "say 2".
• Keys: arrows, Home/End, PageUp/PageDown, typeahead on labels, Enter or click to choose, a choice's number chooses it (waits 700 ms when a longer number also exists). Escape or Cancel sends @abort, which cancels the waiting command. App's Escape sound pause skips .menu-prompt, so sounds keep playing.
• The input is hidden, not unmounted, while a menu shows, and gets focus back afterwards.

Tests: src/mcp/packages/menu.test.ts, src/components/MenuPrompt.test.tsx.