feat(automation): BPMN ⇄ structured-construct model mapping (ADR-0031, task 5)#1500
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…31, task 5) Add the semantic bridge between the structured control-flow constructs (native model) and the BPMN gateway/boundary/multi-instance vocabulary (interop only), at the flow-model level — independent of any wire format. spec (@objectstack/spec) — automation/bpmn-mapping.ts: - exportConstructsToBpmn(flow): parallel -> parallel_gateway + branches + join_gateway; try_catch -> protected activity + error boundary_event + handler; loop -> body marked with multi-instance loopCharacteristics. Each expansion's anchor carries an `osConstruct` extension marker. - importBpmnToConstructs(flow): exact reconstruction from the marker (so construct -> BPMN -> construct is identity), plus best-effort folding of foreign parallel_gateway/join_gateway pairs, with diagnostics for shapes it can't safely fold. - 9 tests incl. exact round-trips (parallel/try_catch/loop) and foreign folding. BPMN 2.0 XML (de)serialization layers on top and stays a plugin concern (bpmn-interop.zod.ts) — out of scope here. ADR-0031 updated. https://claude.ai/code/session_012ti8cx3TkdiQdjCnZXZg2Q
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The structured control-flow constructs (loop/parallel/try-catch) and the BPMN interop mapping are implemented and merged (#1482, #1489, #1499, #1500; docs #1497). Flip ADR-0031 from Proposed to Accepted and record the implementing PRs and the deferred follow-ups (#1504 BPMN XML plugin, #1505 region step logs). https://claude.ai/code/session_012ti8cx3TkdiQdjCnZXZg2Q Co-authored-by: Claude <noreply@anthropic.com>
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Implements ADR-0031 task 5 (issue #1479) — the BPMN ⇄ structured-construct mapping, completing the ADR-0031 roadmap.
Scope decision (long-term lens)
ADR-0031 makes the structured constructs the native model and BPMN interop-only ("Priority: Low"). The durable, reusable asset is the semantic mapping at the flow-model level — that logic is needed regardless of the wire format. So this PR delivers the model-level mapping (pure, no XML dependency); BPMN 2.0 XML (de)serialization layers on top and stays a plugin concern (per
bpmn-interop.zod.ts), as a follow-up.What's in this PR —
@objectstack/specautomation/bpmn-mapping.ts(new)Export —
exportConstructsToBpmn(flow)expands each construct into its BPMN interchange shape so external BPM tools see a well-formed graph:parallel→parallel_gateway(AND-split) + branch regions +join_gateway(AND-join)try_catch→ the protected activity + an errorboundary_event+ the handler regionloop(withbody) → its body marked with multi-instanceloopCharacteristicsEach expansion's anchor node carries an
osConstructextension marker (the analogue of BPMNextensionElements).Import —
importBpmnToConstructs(flow)folds BPMN back into constructs:osConstructmarker → exact reconstruction (soconstruct → BPMN → constructis identity)parallel_gateway/join_gatewaypairs into aparallelblock; shapes it can't safely fold (foreign boundary events, multi-instance markers) are left in place with diagnostics.Both return a
{ flow, diagnostics, mappedCount, unmappedCount }result (mirrorsBpmnInteropResultSchema).Tests
automation/bpmn-mapping.test.ts— 9 tests: expansion shape + exact round-trips for parallel / try_catch (retry preserved) / loop, foreign gateway folding, and the two warning paths (foreign boundary event; gateway with no matching join). Spectsc --noEmitclean; full automation suite 293.Roadmap (#1479) — complete
https://claude.ai/code/session_012ti8cx3TkdiQdjCnZXZg2Q
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