feat(platform): add pipeline.Construct engine#403
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This was referenced Jul 20, 2026
## Summary - Introduces `platform/pipeline` with the typed `Construct[D]` engine - `Stage[D]` struct declares pipeline topology as a typed table (key, name, consumer group, controller constructor, optional DLQ) - Engine builds topic registry, creates primary + DLQ consumers, eagerly constructs all controllers, pairs DLQ stages automatically - Returns a `lifecycle.Component` for ordered start/stop - Options: `TopicNames`, `Classifiers`, `PublishOnly`, `ExtraComponents` - Pure addition — no existing code changes Step 2 of the [Modular Queue Wiring RFC](https://github.com/uber/submitqueue/blob/main/doc/rfc/submitqueue/modular-queue-wiring.md). Stacked on #402. ## Test plan - [x] 10 unit tests: single stage, DLQ pairing, multiple stages, empty stages error, controller creation failure, DLQ creation failure, publish-only topics, topic name overrides, resolveTopicName table test, dlqTopicKey, buildTopicConfigs - [x] `bazel test //platform/pipeline:go_default_test` passes - [x] `make gazelle` — BUILD.bazel in sync - [x] `make fmt` — code formatted Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>
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Summary
Test plan
bazel test //platform/pipeline:go_default_testpassesmake gazelle— BUILD.bazel in syncmake fmt— code formattedCo-Authored-By: Claude Opus 4.6 noreply@anthropic.com
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