chore: import upstream snapshot with attribution

.pre-commit-hooks/check-commit-msg.sh

@@ -0,0 +1,25 @@
+#!/usr/bin/env bash
+# Validate commit message format: [Module:Type] Description
+# Example: [LLM:Feature] Add streaming support
+
+MSG=$(head -1 "$1")
+
+# Allow merge commits
+if printf '%s\n' "$MSG" | grep -qE "^Merge "; then
+    exit 0
+fi
+
+# Check format: [Module:Type] Description
+if ! printf '%s\n' "$MSG" | grep -qE '^\[[A-Za-z0-9]+:(Feature|Bugfix|Perf|Refact|Style|Doc|Test|Chore|Release)\] .+'; then
+    echo "ERROR: Commit message format must be:"
+    echo "  [Module:Type] Description"
+    echo ""
+    echo "  Module: LLM, CPU, Metal, CUDA, OpenCL, Vulkan, Core, Infra, Doc, etc."
+    echo "  Type:   Feature, Bugfix, Perf, Refact, Style, Doc, Test, Chore, Release"
+    echo ""
+    echo "  Example: [LLM:Feature] Add streaming support"
+    echo "  Got:     $MSG"
+    exit 1
+fi
+
+exit 0