feat(three-stage-scan): add split-sink fixtures the regex scan misses

benchmarks/manifests/split-sink-c.toml

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+name = "split-sink-c"
+language = "c_cpp"
+frameworks = ["native"]
+setup = []
+modes = ["quick", "standard"]
+known_noise = []
+baselines = []
+
+[source]
+type = "local"
+path = "../fixtures/split-sink-c"
+
+[[expected]]
+cwe = "CWE-89"
+class = "sql injection"
+path = "src/vuln.c"
+line = 7
+function = "search"
+sink = "sqlite3_exec"
+evidence = "sqlite3_exec runs a SQL query string built from attacker input on a prior line"

benchmarks/manifests/split-sink-java.toml

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+name = "split-sink-java"
+language = "java_web"
+frameworks = ["servlet"]
+setup = ["mvn test"]
+modes = ["quick", "standard"]
+known_noise = []
+baselines = []
+
+[source]
+type = "local"
+path = "../fixtures/split-sink-java"
+
+[[expected]]
+cwe = "CWE-89"
+class = "sql injection"
+path = "src/main/java/example/SplitSinkServlet.java"
+line = 10
+function = "search"
+sink = "executeQuery"
+evidence = "executeQuery runs a SQL string built from request input on a prior line"

benchmarks/manifests/split-sink-javascript.toml

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+name = "split-sink-javascript"
+language = "javascript_node_web"
+frameworks = ["node", "express"]
+setup = ["npm install"]
+modes = ["quick", "standard"]
+known_noise = []
+baselines = []
+
+[source]
+type = "local"
+path = "../fixtures/split-sink-javascript"
+
+[[expected]]
+cwe = "CWE-89"
+class = "sql injection"
+path = "src/app.js"
+line = 8
+sink = "query"
+evidence = "query runs a SQL string built from request input on a prior line"

benchmarks/manifests/split-sink-python.toml

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+name = "split-sink-python"
+language = "python_web"
+frameworks = ["flask"]
+setup = ["pip install flask"]
+modes = ["quick", "standard"]
+known_noise = []
+baselines = []
+
+[source]
+type = "local"
+path = "../fixtures/split-sink-python"
+
+[[expected]]
+cwe = "CWE-89"
+class = "sql injection"
+path = "app.py"
+line = 11
+function = "search"
+sink = "execute"
+evidence = "execute runs a SQL query string built from request input on a prior line"