Nomad changes

docs/snippets/zig/api/extract_file_async.md

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+<!-- snippet:syntax-only -->
+
+```zig title="Zig"
+const std = @import("std");
+const kreuzberg = @import("kreuzberg");
+
+// Note: the Zig binding is sync-only. There is no `extract_file` async variant —
+// the FFI surface exposes blocking entry points that internally drive the global
+// Tokio runtime. Use `extract_file_sync` from any thread.
+pub fn main() !void {
+    const config_json = "{}";
+    const result_json = try kreuzberg.extract_file_sync("document.pdf", null, config_json);
+    defer std.heap.c_allocator.free(result_json);
+
+    const stdout = std.io.getStdOut().writer();
+    try stdout.print("{s}\n", .{result_json});
+}
+```