refactor(mergechecker): accept entity.Request, resolve change internally#217
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## Summary ### Why? Extension input granularity is inconsistent across the orchestrator pipeline: `conflict.Analyzer` takes orchestrator identity (`entity.Batch`), while `scorer` / `mergechecker` / `changeprovider` / `buildrunner` / `pusher` take controller-resolved `entity.Change`. The split caps what an extension can do — a real `target_overlap` conflict analyzer and a diff-aware heuristic scorer both cannot be written today, because the data they need is neither in the contract nor resolvable by the extension. ### What? Adds `doc/rfc/submitqueue/extension-contract.md` proposing that decision/action extensions accept thin reference entities at their pipeline-stage granularity (`entity.Request` for request-stage, `entity.Batch` / `[]entity.Batch` for batch-stage) and resolve granular content themselves via narrowly-injected `Factory` dependencies, while `storage` / `changestore` / `queueconfig` stay key/value resolution targets. `conflict.Analyzer` is the baseline. The RFC revises the BuildRunner base/head contract (`build-runner.md`) to pass batches rather than change lists. Also encodes the rule in `CLAUDE.md` so new extensions and signature changes follow it, and links the RFC from the RFC index. Documentation only — no code changes. ## Test Plan ## Issues ## Stack 1. @ #214 1. #216 1. #217 1. #218 1. #219 1. #221 1. #222 1. #223 1. #227
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## Summary Add submitqueue/core/changeset, the single place the orchestrator resolves batch identity into the changes a batch contains — consolidating the batch -> requests -> changes walk that the build, merge, and score controllers each performed privately. Resolver exposes two single-batch fidelities, both keyed per batch so callers with several batches loop and keep the per-batch boundary: ChangesForBatch returns raw changes (URIs only, no change-store read) for the build and merge stages, and DetailedForBatch returns one ChangeInfo per claimed URI with provider details read from the change store, for the score stage and detail-aware analyzers. Ships with a store-backed implementation (depending only on the request and change stores), a programmable in-memory fake, a generated mock, and tests. The package is added unused; extensions adopt it in later branches. entity.BatchChanges is repurposed as DetailedForBatch's output (doc comment only). The mocks make-target gains the new package. ## Test Plan ## Issues ## Stack 1. #214 1. @ #216 1. #217 1. #218 1. #219 1. #221 1. #222 1. #223 1. #227
Change MergeChecker.Check to take the orchestrator's request identity (entity.Request) instead of a controller-pre-resolved entity.Change, per the extension contract. The GitHub implementation and the fake read request.Change themselves; the validate controller hands over the request it already loaded. Output is unchanged (mergechecker.Result). The factory and Config are unchanged — no dependency injection is needed since the checker resolves nothing beyond the change already on the request.
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…nally (#218) ## Summary Change ChangeProvider.Get to take the orchestrator's request identity (entity.Request) instead of a controller-pre-resolved entity.Change, per the extension contract. The GitHub implementation and the fake read request.Change themselves; the validate controller hands over the request it already loaded. Output is unchanged: one entity.ChangeInfo per URI, each self-identifying by URI. The provider is the external resolver, so it needs no injected dependency — the factory and Config are unchanged. ## Test Plan ## Issues ## Stack 1. #217 1. @ #218 1. #219 1. #221 1. #222 1. #223 1. #227
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## Summary Change Scorer.Score to take the batch identity (entity.Batch) instead of a controller-pre-resolved entity.BatchChanges, per the extension contract. The score controller drops its private collectBatchChanges walk and just hands the batch to the scorer. The heuristic scorer and the fake gain an injected changeset.Resolver and call DetailedForBatch to resolve the batch's changes themselves; the composite scorer delegates the batch to its children unchanged. The wiring constructs one resolver from the request and change stores and injects it into every scorer it builds. Output is unchanged (a single float64 score per batch). The scorer factory and Config are unchanged — the resolver is injected at construction. ## Test Plan ## Issues ## Stack 1. #217 1. #218 1. @ #219 1. #221 1. #222 1. #223 1. #227
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Summary
Change MergeChecker.Check to take the orchestrator's request identity (entity.Request) instead of a controller-pre-resolved entity.Change, per the extension contract. The GitHub implementation and the fake read request.Change themselves; the validate controller hands over the request it already loaded.
Output is unchanged (mergechecker.Result). The factory and Config are unchanged — no dependency injection is needed since the checker resolves nothing beyond the change already on the request.
Test Plan
Issues
Stack