chore: import upstream snapshot with attribution

scripts/benchmark-search-graph.sh

@@ -0,0 +1,63 @@
+#!/usr/bin/env bash
+# benchmark-search-graph.sh — Time search_graph name_pattern= queries against a
+# codebase-memory-mcp binary to measure the regex / LIKE pre-filter performance.
+#
+# Usage:
+#   scripts/benchmark-search-graph.sh <binary-path> <project-name>
+#
+# Example:
+#   scripts/benchmark-search-graph.sh ./build/c/codebase-memory-mcp my-project
+
+set -euo pipefail
+
+BINARY="${1:?Usage: $0 <binary-path> <project-name>}"
+PROJECT="${2:?Usage: $0 <binary-path> <project-name>}"
+
+echo "Binary:  $BINARY"
+echo "Project: $PROJECT"
+echo ""
+
+run_case() {
+    local label="$1"
+    local request="$2"
+    local start end elapsed_ms result
+
+    start=$(date +%s%3N)
+    result=$(echo "$request" | "$BINARY" 2>/dev/null || true)
+    end=$(date +%s%3N)
+    elapsed_ms=$(( end - start ))
+
+    local count
+    count=$(echo "$result" | python3 -c "
+import sys, json
+try:
+    d = json.load(sys.stdin)
+    content = d.get('result', {}).get('content', [{}])[0].get('text', '{}')
+    obj = json.loads(content)
+    print(obj.get('total', obj.get('count', '?')))
+except Exception:
+    print('?')
+" 2>/dev/null || echo "?")
+
+    printf "  %-55s %5dms  (total=%s)\n" "$label" "$elapsed_ms" "$count"
+}
+
+sg() {
+    local project="$1"
+    local args="$2"
+    printf '{"jsonrpc":"2.0","id":1,"method":"tools/call","params":{"name":"search_graph","arguments":{"project":"%s",%s}}}' \
+        "$project" "$args"
+}
+
+echo "=== search_graph name_pattern= benchmarks ==="
+run_case "name_pattern=.*Controller.*"         "$(sg "$PROJECT" '"name_pattern":".*Controller.*","limit":20')"
+run_case "name_pattern=.*Service.*"            "$(sg "$PROJECT" '"name_pattern":".*Service.*","limit":20')"
+run_case "name_pattern=.*Repository.*"         "$(sg "$PROJECT" '"name_pattern":".*Repository.*","limit":20')"
+run_case "name_pattern=specificFunctionName"   "$(sg "$PROJECT" '"name_pattern":"specificFunctionName","limit":20')"
+run_case "label=Method + name_pattern=.*get.*" "$(sg "$PROJECT" '"label":"Method","name_pattern":".*get.*","limit":20')"
+
+echo ""
+echo "=== search_graph query= benchmarks (BM25 path) ==="
+run_case "query=controller service handler"                   "$(sg "$PROJECT" '"query":"controller service handler","limit":20')"
+run_case "query=user authentication permission role"          "$(sg "$PROJECT" '"query":"user authentication permission role","limit":20')"
+run_case "query=create update delete manage list view admin"  "$(sg "$PROJECT" '"query":"create update delete manage list view admin","limit":20')"