Initial closure sample app for 917SoC

docs/examples/closure.md

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+## Closure
+
+```{toctree}
+:glob:
+:maxdepth: 1
+
+closure-app/**/README
+```

examples/closure-app/closure-common/BUILD.gn

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+# Copyright (c) 2025 Project CHIP Authors
+#
+# Licensed under the Apache License, Version 2.0 (the "License");
+# you may not use this file except in compliance with the License.
+# You may obtain a copy of the License at
+#
+# http://www.apache.org/licenses/LICENSE-2.0
+#
+# Unless required by applicable law or agreed to in writing, software
+# distributed under the License is distributed on an "AS IS" BASIS,
+# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+# See the License for the specific language governing permissions and
+# limitations under the License.
+
+import("//build_overrides/chip.gni")
+import("${chip_root}/examples/common/pigweed/pigweed_rpcs.gni")
+import("${chip_root}/src/app/chip_data_model.gni")
+
+config("config") {
+  include_dirs = [ "common/include" ]
+}
+
+chip_data_model("closure-common") {
+  zap_file = "closure-app.zap"
+  is_server = true
+}