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.

system/services/display/build.zig

@@ -10,8 +10,8 @@ pub fn build(b: *std.Build) void {
         .name = "display",
         .root_source_file = b.path("display.zig"),
         .imports = &.{
-            "display", "display-protocol", "driver", "input", "ipc", "logging", "memory",
-            "scanout-protocol", "service", "thread", "time",
+            "display-client", "display-protocol", "driver", "input-client", "ipc", "logging",
+            "memory", "scanout-protocol", "service", "thread", "time",
         },
         .threaded = true, // real atomics/TLS (docs/threading.md)
     });