docs(hdmi): WirePlumber 固化 Kaisa HDMI 输出与默认 sink 优先级

新增仓库内 WirePlumber 片段示例（pro-audio + pro-output 优先级）与
OPERATION_PipeWire_Kaisa_HDMI.md；CHROMEOS515 文档增加 §4.3 链至桌面会话
排障；next.md 补充 PipeWire 链路与内核验证流程更新。

Made-with: Cursor

docs/linux-hdmi/wireplumber/50-kaisa-sof-rt5682-hdmi.conf

@@ -0,0 +1,64 @@
+monitor.alsa.rules = [
+  {
+    matches = [
+      { "device.name" = "alsa_card.pci-0000_00_1f.3-platform-cml_rt5682_def" }
+    ]
+    actions = {
+      update-props = {
+        device.profile = "pro-audio"
+      }
+    }
+  }
+  {
+    matches = [
+      {
+        node.name = "alsa_output.pci-0000_00_1f.3-platform-cml_rt5682_def.pro-output-0"
+      }
+    ]
+    actions = {
+      update-props = {
+        priority.driver = 1000
+        priority.session = 1000
+      }
+    }
+  }
+  {
+    matches = [
+      {
+        node.name = "alsa_output.pci-0000_00_1f.3-platform-cml_rt5682_def.pro-output-2"
+      }
+    ]
+    actions = {
+      update-props = {
+        priority.driver = 1100
+        priority.session = 1100
+      }
+    }
+  }
+  {
+    matches = [
+      {
+        node.name = "alsa_output.pci-0000_00_1f.3-platform-cml_rt5682_def.pro-output-3"
+      }
+    ]
+    actions = {
+      update-props = {
+        priority.driver = 1090
+        priority.session = 1090
+      }
+    }
+  }
+  {
+    matches = [
+      {
+        node.name = "alsa_output.pci-0000_00_1f.3-platform-cml_rt5682_def.pro-output-4"
+      }
+    ]
+    actions = {
+      update-props = {
+        priority.driver = 1095
+        priority.session = 1095
+      }
+    }
+  }
+]