feat(automation): add BPMN parallel gateway, default flow, boundary event, and wait event semantics

ROADMAP.md

@@ -141,7 +141,7 @@ Multi-stage triggers, action pipelines, execution logs, and cron scheduling stan
 
 | Item | Status | Location |
 |:---|:---:|:---|
-| Flow orchestration (14 node types) | ✅ | `automation/flow.zod.ts` |
+| Flow orchestration (18 node types) | ✅ | `automation/flow.zod.ts` |
 | Trigger registry (record, field, webhook) | ✅ | `automation/trigger-registry.zod.ts` |
 | Cron scheduling expression | ✅ | `automation/etl.zod.ts`, `automation/webhook.zod.ts` |
 | Action pipeline (webhook, email, CRUD, notification) | ✅ | `automation/flow.zod.ts` (HTTP, CRUD, script nodes) |
@@ -166,6 +166,11 @@ Multi-stage triggers, action pipelines, execution logs, and cron scheduling stan
 | Safe expression evaluation (no `new Function`) | ✅ | `@objectstack/service-automation` → operator-based parser, no code execution |
 | Node input/output schema validation | ✅ | `automation/flow.zod.ts` → `inputSchema`/`outputSchema` per node, runtime validation |
 | Flow version history & rollback | ✅ | `automation/flow.zod.ts` → `FlowVersionHistorySchema`, engine version management |
+| BPMN parallel gateway & join gateway | ✅ | `automation/flow.zod.ts` → `parallel_gateway` (AND-split), `join_gateway` (AND-join) node types |
+| BPMN default sequence flow | ✅ | `automation/flow.zod.ts` → `isDefault` field + `conditional` edge type on `FlowEdgeSchema` |
+| BPMN boundary events (error/timer/signal) | ✅ | `automation/flow.zod.ts` → `boundary_event` node type + `boundaryConfig` (interrupting/non-interrupting) |
+| BPMN wait event configuration | ✅ | `automation/flow.zod.ts` → `waitEventConfig` (timer/signal/webhook/manual/condition event types) |
+| BPMN checkpoint reasons (parallel join, boundary) | ✅ | `automation/execution.zod.ts` → `parallel_join`, `boundary_event` in `CheckpointSchema.reason` |
 
 ### 3. File Direct Upload & Resumable Upload Protocol
 

packages/spec/src/automation/execution.test.ts

@@ -259,7 +259,7 @@ describe('CheckpointSchema', () => {
   });
 
   it('should accept all valid checkpoint reasons', () => {
-    const reasons = ['wait', 'screen_input', 'approval', 'error', 'manual_pause'];
+    const reasons = ['wait', 'screen_input', 'approval', 'error', 'manual_pause', 'parallel_join', 'boundary_event'];
     reasons.forEach((r) => {
       const cp = CheckpointSchema.parse({
         id: 'cp_test',

packages/spec/src/automation/execution.zod.ts

@@ -178,7 +178,7 @@ export const CheckpointSchema = z.object({
   expiresAt: z.string().datetime().optional().describe('Checkpoint expiration (auto-cleanup)'),
 
   /** Reason */
-  reason: z.enum(['wait', 'screen_input', 'approval', 'error', 'manual_pause'])
+  reason: z.enum(['wait', 'screen_input', 'approval', 'error', 'manual_pause', 'parallel_join', 'boundary_event'])
     .describe('Why the execution was checkpointed'),
 });
 export type Checkpoint = z.infer<typeof CheckpointSchema>;