feat(submitqueue): cut over internal queues to protojson - #703
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sbalabanov
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## Summary
### Why?
SubmitQueue's pipeline still serialized Go structs with encoding/json, while Stovepipe and the queue-contract RFC use proto3 + protojson with one message per topic key. That left the internal contract without a language-neutral schema and made additive field growth a shared-struct change.
### What?
Add submitqueue/core/messagequeue (proto payloads, protojson glue, TopicKey constants, and entity mapping). Gateway and orchestrator publish and consume the message bound to each topic. MarshalID/UnmarshalID take the topic key so a later field is not discarded onto the wrong type. Proto filenames that collide in the protobuf registry are prefixed (submitqueuemerge, submitqueuebuild, submitqueuebuildsignal). Queue-only ToBytes/FromBytes helpers are removed from entities. Hard cutover: drain or drop in-flight start and log messages; id-only topics stay {id,queue}.
## Test Plan
✅ `bazel test` of `//submitqueue/core/messagequeue:go_default_test` plus gateway and orchestrator/DLQ controller tests
✅ `bazel test //test/e2e/submitqueue:go_default_test --test_filter=TestE2EIntegration`
✅ `bazel test //test/e2e/submitqueue:go_default_test --test_filter=TestGitMergeE2E`
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Summary
Why?
SubmitQueue's pipeline still serialized Go structs with encoding/json, while Stovepipe and the queue-contract RFC use proto3 + protojson with one message per topic key. That left the internal contract without a language-neutral schema and made additive field growth a shared-struct change.
What?
Add submitqueue/core/messagequeue (proto payloads, protojson glue, TopicKey constants, and entity mapping). Gateway and orchestrator publish and consume the message bound to each topic. MarshalID/UnmarshalID take the topic key so a later field is not discarded onto the wrong type. Proto filenames that collide in the protobuf registry are prefixed (submitqueuemerge, submitqueuebuild, submitqueuebuildsignal). Queue-only ToBytes/FromBytes helpers are removed from entities. Hard cutover: drain or drop in-flight start and log messages; id-only topics stay {id,queue}.
Test Plan
✅
bazel testof//submitqueue/core/messagequeue:go_default_testplus gateway and orchestrator/DLQ controller tests✅
bazel test //test/e2e/submitqueue:go_default_test --test_filter=TestE2EIntegration✅
bazel test //test/e2e/submitqueue:go_default_test --test_filter=TestGitMergeE2E