feat(coding-agent): add experimental feature guard (#5547)

packages/coding-agent/src/core/experimental.ts

@@ -0,0 +1,3 @@
+export function areExperimentalFeaturesEnabled(): boolean {
+	return process.env.PI_EXPERIMENTAL === "1";
+}

packages/coding-agent/src/core/index.ts

@@ -28,6 +28,7 @@ export {
 export { type BashExecutorOptions, type BashResult, executeBashWithOperations } from "./bash-executor.ts";
 export type { CompactionResult } from "./compaction/index.ts";
 export { createEventBus, type EventBus, type EventBusController } from "./event-bus.ts";
+export { areExperimentalFeaturesEnabled } from "./experimental.ts";
 // Extensions system
 export {
 	type AgentEndEvent,