agent: add markdown command

src/agent/Command.zig

@@ -16,6 +16,7 @@ pub const Command = union(enum) {
     type_cmd: TypeArgs,
     wait: []const u8,
     tree: void,
+    markdown: void,
     extract: ExtractArgs,
     eval_js: []const u8,
     exit: void,
@@ -61,6 +62,10 @@ pub fn parse(line: []const u8) Command {
         return .{ .tree = {} };
     }
 
+    if (eqlIgnoreCase(cmd_word, "MARKDOWN") or eqlIgnoreCase(cmd_word, "MD")) {
+        return .{ .markdown = {} };
+    }
+
     if (eqlIgnoreCase(cmd_word, "EXTRACT")) {
         const selector = extractQuoted(rest) orelse {
             if (rest.len == 0) return .{ .natural_language = trimmed };

src/agent/CommandExecutor.zig

@@ -28,6 +28,7 @@ pub fn execute(self: *Self, cmd: Command.Command) void {
         .type_cmd => |args| self.execType(a, args),
         .wait => |selector| self.tool_executor.call(a, "waitForSelector", buildJson(a, .{ .selector = selector })) catch "Error: wait failed",
         .tree => self.tool_executor.call(a, "semantic_tree", "") catch "Error: tree failed",
+        .markdown => self.tool_executor.call(a, "markdown", "") catch "Error: markdown failed",
         .extract => |args| self.execExtract(a, args),
         .eval_js => |script| self.tool_executor.call(a, "evaluate", buildJson(a, .{ .script = script })) catch "Error: eval failed",
         .exit, .natural_language => unreachable,