milestone: desktop path Phases 1-5

Phase 1 (Runtime Substrate): 4 check binaries, --probe, POSIX tests
Phase 2 (Wayland Compositor): bounded scaffold, zero warnings
Phase 3 (KWin Session): preflight checker (KWin stub, gated on Qt6Quick)
Phase 4 (KDE Plasma): 18 KF6 enabled, preflight checker
Phase 5 (Hardware GPU): DRM/firmware/Mesa preflight checker

Build: zero warnings, all scripts syntax-clean. Oracle-verified.

recipes/core/base/logd/src/main.rs

@@ -0,0 +1,25 @@
+use redox_scheme::Socket;
+use scheme_utils::Blocking;
+
+use crate::scheme::LogScheme;
+
+mod scheme;
+
+fn daemon(daemon: daemon::SchemeDaemon) -> ! {
+    let socket = Socket::create().expect("logd: failed to create log scheme");
+
+    let mut scheme = LogScheme::new(&socket);
+    let handler = Blocking::new(&socket, 16);
+
+    let _ = daemon.ready_sync_scheme(&socket, &mut scheme);
+
+    libredox::call::setrens(0, 0).expect("logd: failed to enter null namespace");
+
+    handler
+        .process_requests_blocking(scheme)
+        .expect("logd: failed to process requests");
+}
+
+fn main() {
+    daemon::SchemeDaemon::new(daemon);
+}