feat: add stella-callgraph-node for JavaScript/TypeScript call graph extraction

- Implemented a new tool `stella-callgraph-node` that extracts call graphs from JavaScript/TypeScript projects using Babel AST.
- Added command-line interface with options for JSON output and help.
- Included functionality to analyze project structure, detect functions, and build call graphs.
- Created a package.json file for dependency management.

feat: introduce stella-callgraph-python for Python call graph extraction

- Developed `stella-callgraph-python` to extract call graphs from Python projects using AST analysis.
- Implemented command-line interface with options for JSON output and verbose logging.
- Added framework detection to identify popular web frameworks and their entry points.
- Created an AST analyzer to traverse Python code and extract function definitions and calls.
- Included requirements.txt for project dependencies.

chore: add framework detection for Python projects

- Implemented framework detection logic to identify frameworks like Flask, FastAPI, Django, and others based on project files and import patterns.
- Enhanced the AST analyzer to recognize entry points based on decorators and function definitions.

bench/reachability-benchmark/cases/go/grpc-sql/case.yaml

@@ -0,0 +1,46 @@
+id: "go-grpc-sql:302"
+language: go
+project: grpc-sql
+version: "1.0.0"
+description: "SQL injection sink reachable via gRPC GetUser method"
+entrypoints:
+  - "grpc:UserService.GetUser"
+sinks:
+  - id: "SqlInjection::GetUser"
+    path: "main.(*userServer).GetUser"
+    kind: "custom"
+    location:
+      file: main.go
+      line: 35
+    notes: "database/sql.Query with string concatenation"
+environment:
+  os_image: "golang:1.22-alpine"
+  runtime:
+    go: "1.22"
+  source_date_epoch: 1730000000
+  resource_limits:
+    cpu: "2"
+    memory: "2Gi"
+build:
+  command: "go build -o outputs/app ."
+  source_date_epoch: 1730000000
+  outputs:
+    artifact_path: outputs/app
+    sbom_path: outputs/sbom.cdx.json
+    coverage_path: outputs/coverage.json
+    traces_dir: outputs/traces
+    attestation_path: outputs/attestation.json
+test:
+  command: "go test -v ./..."
+  expected_coverage: []
+  expected_traces: []
+ground_truth:
+  summary: "SQL injection reachable"
+  evidence_files:
+    - "../benchmark/truth/go-grpc-sql.json"
+sandbox:
+  network: loopback
+  privileges: rootless
+redaction:
+  pii: false
+  policy: "benchmark-default/v1"

bench/reachability-benchmark/cases/go/grpc-sql/entrypoints.yaml

@@ -0,0 +1,8 @@
+case_id: "go-grpc-sql:302"
+entries:
+  grpc:
+    - id: "grpc:UserService.GetUser"
+      service: "UserService"
+      method: "GetUser"
+      handler: "main.(*userServer).GetUser"
+      description: "Fetches user by ID with SQL injection vulnerability"

bench/reachability-benchmark/cases/go/grpc-sql/go.mod

@@ -0,0 +1,8 @@
+module grpc-sql
+
+go 1.22
+
+require (
+	google.golang.org/grpc v1.64.0
+	google.golang.org/protobuf v1.34.2
+)

bench/reachability-benchmark/cases/go/grpc-sql/main.go

@@ -0,0 +1,86 @@
+// grpc-sql benchmark case
+// Demonstrates SQL injection sink reachable via gRPC handler
+package main
+
+import (
+	"context"
+	"database/sql"
+	"fmt"
+	"log"
+	"net"
+
+	_ "github.com/mattn/go-sqlite3"
+	"google.golang.org/grpc"
+)
+
+// User represents a user record
+type User struct {
+	ID    string
+	Name  string
+	Email string
+}
+
+// userServer implements the gRPC UserService
+type userServer struct {
+	db *sql.DB
+}
+
+// GetUser - VULNERABLE: SQL injection sink
+// User ID is concatenated directly into SQL query
+func (s *userServer) GetUser(ctx context.Context, userID string) (*User, error) {
+	// SINK: database/sql.Query with string concatenation
+	query := fmt.Sprintf("SELECT id, name, email FROM users WHERE id = '%s'", userID)
+	row := s.db.QueryRow(query)
+
+	var user User
+	if err := row.Scan(&user.ID, &user.Name, &user.Email); err != nil {
+		return nil, fmt.Errorf("user not found: %w", err)
+	}
+
+	return &user, nil
+}
+
+// GetUserSafe - SAFE: uses parameterized query
+func (s *userServer) GetUserSafe(ctx context.Context, userID string) (*User, error) {
+	query := "SELECT id, name, email FROM users WHERE id = ?"
+	row := s.db.QueryRow(query, userID)
+
+	var user User
+	if err := row.Scan(&user.ID, &user.Name, &user.Email); err != nil {
+		return nil, fmt.Errorf("user not found: %w", err)
+	}
+
+	return &user, nil
+}
+
+func main() {
+	db, err := sql.Open("sqlite3", ":memory:")
+	if err != nil {
+		log.Fatalf("failed to open database: %v", err)
+	}
+	defer db.Close()
+
+	// Initialize schema
+	_, err = db.Exec(`
+		CREATE TABLE users (
+			id TEXT PRIMARY KEY,
+			name TEXT,
+			email TEXT
+		)
+	`)
+	if err != nil {
+		log.Fatalf("failed to create table: %v", err)
+	}
+
+	lis, err := net.Listen("tcp", ":50051")
+	if err != nil {
+		log.Fatalf("failed to listen: %v", err)
+	}
+
+	s := grpc.NewServer()
+	// Register service here (simplified for benchmark)
+	log.Printf("gRPC server listening on %v", lis.Addr())
+	if err := s.Serve(lis); err != nil {
+		log.Fatalf("failed to serve: %v", err)
+	}
+}

bench/reachability-benchmark/cases/go/grpc-sql/main_test.go

@@ -0,0 +1,56 @@
+package main
+
+import (
+	"context"
+	"database/sql"
+	"testing"
+
+	_ "github.com/mattn/go-sqlite3"
+)
+
+func setupTestDB(t *testing.T) *sql.DB {
+	db, err := sql.Open("sqlite3", ":memory:")
+	if err != nil {
+		t.Fatalf("failed to open database: %v", err)
+	}
+
+	_, err = db.Exec(`
+		CREATE TABLE users (
+			id TEXT PRIMARY KEY,
+			name TEXT,
+			email TEXT
+		);
+		INSERT INTO users (id, name, email) VALUES ('1', 'Alice', 'alice@example.com');
+	`)
+	if err != nil {
+		t.Fatalf("failed to setup test data: %v", err)
+	}
+
+	return db
+}
+
+func TestGetUserSafe(t *testing.T) {
+	db := setupTestDB(t)
+	defer db.Close()
+
+	server := &userServer{db: db}
+	user, err := server.GetUserSafe(context.Background(), "1")
+	if err != nil {
+		t.Fatalf("unexpected error: %v", err)
+	}
+
+	if user.Name != "Alice" {
+		t.Errorf("expected Alice, got %s", user.Name)
+	}
+}
+
+func TestGetUserNotFound(t *testing.T) {
+	db := setupTestDB(t)
+	defer db.Close()
+
+	server := &userServer{db: db}
+	_, err := server.GetUserSafe(context.Background(), "999")
+	if err == nil {
+		t.Error("expected error for non-existent user")
+	}
+}

bench/reachability-benchmark/cases/go/grpc-sql/outputs/.gitkeep

@@ -0,0 +1 @@
+# Keep this directory for build outputs