library: client modules end in -client, like protocols end in -protocol

display-client and input-client (files and module names), so a service,
its wire contract, and its client never share a name: `display` the
service, `display-protocol` the contract, `display-client` a program's
view of it. The nine consumers' imports and their packages' declared
lists follow (regenerated from the source scan); build-support's
module_homes table carries the new names.

library/client/build.zig

@@ -1,5 +1,8 @@
 //! The "client" library domain (library/client): userspace-service clients —
-//! they talk to services over IPC, not to the kernel.
+//! they talk to services over IPC, not to the kernel. Client modules end in
+//! `-client` the way wire protocols end in `-protocol`, so a service, its
+//! protocol, and its client never share a name (`display` the service,
+//! `display-protocol` the wire contract, `display-client` a program's view).
 
 const std = @import("std");
 
@@ -10,16 +13,16 @@ pub fn build(b: *std.Build) void {
     const ipc = kernel.module("ipc");
     const time = kernel.module("time");
 
-    _ = b.addModule("display", .{
-        .root_source_file = b.path("display/display.zig"),
+    _ = b.addModule("display-client", .{
+        .root_source_file = b.path("display/display-client.zig"),
         .imports = &.{
             .{ .name = "ipc", .module = ipc },
             .{ .name = "time", .module = time },
             .{ .name = "display-protocol", .module = protocol.module("display-protocol") },
         },
     });
-    _ = b.addModule("input", .{
-        .root_source_file = b.path("input/input.zig"),
+    _ = b.addModule("input-client", .{
+        .root_source_file = b.path("input/input-client.zig"),
         .imports = &.{
             .{ .name = "ipc", .module = ipc },
             .{ .name = "time", .module = time },