Add experimental preset L and fix DLSS resource lifetimes and waits

- Build L texture variants and complete older release kernel bundles.
- Add selective Swin encoder fallback to reduce L/M motion trails.
- Add opt-in GPU motion-vector dilation for thin geometry and sky gaps.
- Replace GPU input waits with cancellable readiness polling and use
  sleeping event queries for completion.
- Retain recorded resources through command allocator completion, defer
  shutdown until cleanup, and preserve unfinished output synchronization.
- Extend lifecycle harness checks and add event, model and motion tests.
- Update configuration defaults, build scripts and release documentation.

tools/d4r_event_wait.h

@@ -0,0 +1,16 @@
+#pragma once
+
+// Query completion rather than trusting HIP event flags to put the CPU to
+// sleep. Never treat NOT_READY as completion, including during retirement.
+template <typename Query, typename Sleep>
+int d4r_wait_event(Query query, Sleep sleep)
+{
+    constexpr int cudaNotReady = 600;
+    for (;;)
+    {
+        const int result = query();
+        if (result != cudaNotReady)
+            return result;
+        sleep();
+    }
+}