fix: discover agents/nodes before workflows to prevent duplicate DBOS registration

Workflows import agents via relative paths. When all three discovery
functions ran in parallel, the same agent file could be evaluated twice
(once by discoverAgents, once as a workflow dependency) before jiti
cached it, causing duplicate DBOS.registerWorkflow() calls.

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

Author: cevian

packages/core/src/discover.ts

@@ -21,12 +21,16 @@ export interface DiscoverResult {
  * Returns the exact shape that create0pflow() expects.
  */
 export async function discover(projectDir: string): Promise<DiscoverResult> {
-  const [wfResult, nodeResult, agentResult] = await Promise.all([
-    discoverWorkflows(projectDir),
+  // Discover agents and nodes first so they're in jiti's module cache.
+  // Workflows import agents/nodes, and if loaded in parallel, the same
+  // agent file gets evaluated twice causing duplicate DBOS registration.
+  const [nodeResult, agentResult] = await Promise.all([
     discoverNodes(projectDir),
     discoverAgents(projectDir),
   ]);
 
+  const wfResult = await discoverWorkflows(projectDir);
+
   // Convert workflows array to Record keyed by name
   const workflows: Record<string, AnyExecutable> = {};
   for (const wf of wfResult.workflows) {