fix(auto): cache lastCommandCtx from any SF command so Ctrl+Y works immediately

Previously required /autonomous first. Now any slash command (/next, /chat,
/clear etc.) caches the ExtensionCommandContext, so Ctrl+Y YOLO shortcut
works on first press after any command interaction.

Co-authored-by: Copilot <223556219+Copilot@users.noreply.github.com>

src/resources/extensions/sf/commands/index.js

@@ -33,6 +33,17 @@ export function registerSFCommands(pi) {
 			getArgumentCompletions: (prefix) =>
 				getSfTopLevelCommandCompletions(command.cmd, prefix),
 			handler: async (args, ctx) => {
+				// Cache this command ctx so shortcut handlers (Ctrl+Y) can fall back
+				// to a valid ExtensionCommandContext that has newSession().
+				// Import lazily to avoid a circular dep at module load time.
+				importExtensionModule(import.meta.url, "../auto/session.js").then(
+					({ getAutoSession }) => {
+						const s = getAutoSession();
+						if (typeof ctx.newSession === "function") {
+							s.lastCommandCtx = ctx;
+						}
+					},
+				).catch(() => {});
 				await dispatchDirectSFCommand(command.cmd, args, ctx, pi);
 			},
 		});