refactor(src): split oversized modules

src/agents/pi-embedded-runner/lanes.ts

@@ -0,0 +1,13 @@
+export function resolveSessionLane(key: string) {
+  const cleaned = key.trim() || "main";
+  return cleaned.startsWith("session:") ? cleaned : `session:${cleaned}`;
+}
+
+export function resolveGlobalLane(lane?: string) {
+  const cleaned = lane?.trim();
+  return cleaned ? cleaned : "main";
+}
+
+export function resolveEmbeddedSessionLane(key: string) {
+  return resolveSessionLane(key);
+}