feat: wire session bindings through main, ipc, and cli runtime

src/main/runtime/session-bindings-artifact.ts

@@ -0,0 +1,17 @@
+import fs from 'node:fs';
+import path from 'node:path';
+import type { PluginSessionBindingsArtifact } from '../../types';
+
+export function getSessionBindingsArtifactPath(configDir: string): string {
+  return path.join(configDir, 'session-bindings.json');
+}
+
+export function writeSessionBindingsArtifact(
+  configDir: string,
+  artifact: PluginSessionBindingsArtifact,
+): string {
+  const artifactPath = getSessionBindingsArtifactPath(configDir);
+  fs.mkdirSync(configDir, { recursive: true });
+  fs.writeFileSync(artifactPath, `${JSON.stringify(artifact, null, 2)}\n`, 'utf8');
+  return artifactPath;
+}