chore: import upstream snapshot with attribution

.github/pull_request_template.md

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+## Description
+
+<!-- Brief description of the changes -->
+
+## Module
+
+<!-- Which module does this PR affect? e.g. LLM, CPU, Metal, CUDA, OpenCL, Core, Infra -->
+
+## Type
+
+- [ ] Feature
+- [ ] Bugfix
+- [ ] Perf
+- [ ] Refact
+- [ ] Style
+- [ ] Doc
+- [ ] Test
+- [ ] Chore
+
+## Checklist
+
+- [ ] Commit message follows `[Module:Type] Description` format
+- [ ] Code compiles without errors
+- [ ] Tested on relevant platform(s)
+- [ ] No unrelated format or style changes included