feat(platform): add lifecycle.Component and lifecycle.Group#402
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## 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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Introduce `platform/lifecycle` with two exports: - `Component` interface: `Start(ctx) error`, `Stop(ctx) error` — the one lifecycle abstraction every runnable subsystem implements. - `Group`: runs an ordered list of Components as one Component. Start proceeds in order with rollback on partial failure (no half-started state). Stop proceeds in reverse order, joining all errors so none is swallowed. Pure addition — no existing code changes. Ref: doc/rfc/submitqueue/modular-queue-wiring.md (Step 1) Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>
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Summary
Step 1 of the Modular Queue Wiring RFC.
Test plan
Stack