refactor: re-export createNodeV8Runtime from secure-exec, fix bench imports

Export createNodeV8Runtime and V8Runtime from the top-level secure-exec
package so consumers never need to import @secure-exec/v8 directly.
Updated benchmarks and docs to use the new exports.

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

Author: NathanFlurry

docs/process-isolation.mdx

@@ -43,7 +43,7 @@ import {
   NodeRuntime,
   createNodeDriver,
   createNodeRuntimeDriverFactory,
-} from "@secure-exec/node";
+} from "secure-exec";
 
 const rt = new NodeRuntime({
   systemDriver: createNodeDriver(),
@@ -62,12 +62,12 @@ NodeRuntime C ──── Tenant 2 Process (sessions: C1)
 ```
 
 ```ts
-import { createNodeV8Runtime } from "@secure-exec/node";
+import { createNodeV8Runtime } from "secure-exec";
 import {
   NodeRuntime,
   createNodeDriver,
   createNodeRuntimeDriverFactory,
-} from "@secure-exec/node";
+} from "secure-exec";
 
 // Create a dedicated process for this tenant
 const tenantProcess = await createNodeV8Runtime({ maxSessions: 10 });
@@ -95,12 +95,12 @@ NodeRuntime B ──── Process B (session: B1)
 ```
 
 ```ts
-import { createNodeV8Runtime } from "@secure-exec/node";
+import { createNodeV8Runtime } from "secure-exec";
 import {
   NodeRuntime,
   createNodeDriver,
   createNodeRuntimeDriverFactory,
-} from "@secure-exec/node";
+} from "secure-exec";
 
 const processA = await createNodeV8Runtime();
 const processB = await createNodeV8Runtime();

packages/secure-exec/benchmarks/bench-utils.ts

@@ -3,8 +3,8 @@ import {
 	createNodeDriver,
 	createNodeRuntimeDriverFactory,
 	createNodeV8Runtime,
-} from "@secure-exec/node";
-import type { V8Runtime } from "@secure-exec/node";
+} from "../src/index.js";
+import type { V8Runtime } from "../src/index.js";
 import os from "node:os";
 
 export const BATCH_SIZES = [1, 10, 50, 100, 200];

packages/secure-exec/benchmarks/profile-phases.ts

@@ -7,7 +7,7 @@ import {
 	createNodeDriver,
 	createNodeRuntimeDriverFactory,
 	createNodeV8Runtime,
-} from "@secure-exec/node";
+} from "../src/index.js";
 
 const TRIVIAL_CODE = `export const x = 1;`;
 const RUNS = 30;

packages/secure-exec/src/index.ts

@@ -38,17 +38,20 @@ export type {
 	TimingMitigation,
 } from "./shared/api-types.js";
 
-// Re-export Node driver factories.
+// Re-export Node driver factories and V8 runtime.
 export {
 	createDefaultNetworkAdapter,
 	createNodeDriver,
 	createNodeRuntimeDriverFactory,
+	createNodeV8Runtime,
 	NodeExecutionDriver,
 	NodeFileSystem,
 } from "@secure-exec/node";
 export type {
 	ModuleAccessOptions,
 	NodeRuntimeDriverFactoryOptions,
+	NodeV8RuntimeOptions,
+	V8Runtime,
 } from "@secure-exec/node";
 
 // TODO: Re-enable once @secure-exec/python is a reliable optional dependency