feat(automation): structured try/catch/retry block (ADR-0031, task 4)#1499
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Add engine execution for the `try_catch` construct — the structured error model (ADR-0031 §Decision 3), completing the native control-flow trio (loop / parallel / try-catch). - new builtin/try-catch-node.ts: runs the protected `try` region via engine.runRegion; on failure retries with exponential backoff (config.retry), then runs the optional `catch` region with the caught error bound to config.errorVariable (default `$error`). try success (incl. a retry) → node succeeds; catch handling a failure → node succeeds; no catch / failing catch → node fails to the flow's fault edge / error handling. - registered as a built-in node executor. - well-formedness (single-entry/single-exit try/catch regions) already enforced at registerFlow() by validateControlFlow (shipped with the loop container). - showcase ResilientSyncFlow + 8 executor tests; changeset added. https://claude.ai/code/session_012ti8cx3TkdiQdjCnZXZg2Q
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The structured control-flow constructs (loop/parallel/try-catch) and the BPMN interop mapping are implemented and merged (#1482, #1489, #1499, #1500; docs #1497). Flip ADR-0031 from Proposed to Accepted and record the implementing PRs and the deferred follow-ups (#1504 BPMN XML plugin, #1505 region step logs). https://claude.ai/code/session_012ti8cx3TkdiQdjCnZXZg2Q Co-authored-by: Claude <noreply@anthropic.com>
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Implements ADR-0031 task 4 (issue #1479) — engine execution for the structured
try_catchconstruct, completing the native control-flow execution trio (loop #1482 / parallel #1489 / try-catch). Builds on the schemas +runRegion+ region validation already onmain.What's in this PR
@objectstack/service-automation—builtin/try-catch-node.ts(new)tryregion viarunRegionin the enclosing variable scope.tryregion with exponential backoff (config.retry:maxRetries,retryDelayMs,backoffMultiplier,maxRetryDelayMs,jitter).catchregion with the caught error bound toconfig.errorVariable(default$error).try(or a retry) succeeds → node succeeds;catchhandles the failure → node succeeds; nocatch, orcatchitself fails → node fails, surfacing to the flow's fault edge / error handling.fault+ backoff-retry semantics as a construct (not BPMN boundary events). Registered as a built-in executor.Well-formedness (single-entry/single-exit
try/catchregions) is already enforced atregisterFlow()byvalidateControlFlowfrom the loop PR.Showcase / changeset
ResilientSyncFlow— pushes a task to an external system, retrying on failure and recording the error viacatch.Tests
builtin/try-catch-node.test.ts— 8 tests: try-succeeds (catch not run), catch-on-failure (+error binding), retry-then-succeed, retry-exhausted→catch, no-catch→node fails, catch-itself-fails, malformed-try rejected at register, multi-node try ordering.Roadmap (#1479)
https://claude.ai/code/session_012ti8cx3TkdiQdjCnZXZg2Q
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