refactor: relocate counter and rename queue messaging packages

Structural moves only — no behavior change.

- Relocate submitqueue/extension/counter -> extension/counter (generic
  infrastructure belongs at the shared top level alongside the other
  cross-domain extensions).
- Rename the messaging-transport packages entity/queue -> entity/messagequeue
  and extension/queue -> extension/messagequeue (package `messagequeue`),
  including the mysql impl, mock, ctl, and schema. "queue" was overloaded with
  the submit queue (Request.Queue, QueueConfig); messagequeue disambiguates.

Repoints all import paths, converges call sites onto the entityqueue /
extqueue / queuemock / queueMySQL aliases (no bare `queue.` package ref
remains), moves the integration suites, and updates Makefile, CI targets, and
docs. Test compose contexts renamed to ext-counter-mysql / ext-messagequeue-sql.

## Test Plan

✅ make build, make test
✅ make gazelle / tidy / mocks clean

Author: behinddwalls

.github/workflows/ci.yml

@@ -117,7 +117,7 @@ jobs:
       - uses: ./.github/actions/setup
       - uses: ./.github/actions/run-bazel-test
         with:
-          target: //test/integration/submitqueue/extension/counter/...
+          target: //test/integration/extension/counter/...
 
   queue-integration-test:
     name: Queue Extension Test
@@ -128,7 +128,7 @@ jobs:
       - uses: ./.github/actions/setup
       - uses: ./.github/actions/run-bazel-test
         with:
-          target: //test/integration/extension/queue/...
+          target: //test/integration/extension/messagequeue/...
 
   storage-integration-test:
     name: Storage Extension Test

CLAUDE.md

@@ -140,8 +140,8 @@ Paths follow the directory layout: shared code is top-level, domain code nests u
 - Domain entities: `github.com/uber/submitqueue/{domain}/entity` (e.g. `.../submitqueue/entity`)
 - Domain extensions: `github.com/uber/submitqueue/{domain}/extension/{ext}[/{impl}]` (e.g. `.../submitqueue/extension/storage/mysql`)
 - Domain-internal infra: `github.com/uber/submitqueue/{domain}/core/{pkg}` (e.g. `.../submitqueue/core/consumer`, `.../submitqueue/core/request`)
-- Shared entities: `github.com/uber/submitqueue/entity/{name}` (e.g. `.../entity/queue`)
-- Shared extensions: `github.com/uber/submitqueue/extension/{name}` (e.g. `.../extension/queue`)
+- Shared entities: `github.com/uber/submitqueue/entity/{name}` (e.g. `.../entity/messagequeue`)
+- Shared extensions: `github.com/uber/submitqueue/extension/{name}` (e.g. `.../extension/messagequeue`)
 - Cross-domain infra: `github.com/uber/submitqueue/core/{pkg}` (e.g. `.../core/errs`, `.../core/metrics`)
 
 ## Development
@@ -167,7 +167,7 @@ Generated proto files are committed. When modifying `.proto` files:
 - **Directories**: singular (`mock/`, `entity/`, not `mocks/`, `entities/`)
 - **Files**: `{method}.go`, `{entity}.go`, `{file}_test.go`, `BUILD.bazel`
 - **Proto files**: `{service}.proto`
-- **Test compose contexts**: the `testContext` passed to `NewComposeStack` (and thus the `sq-test-{context}-…` Docker project/container names) must be **domain-qualified** — `{category}-{domain}-{name}` where `{category}` is `svc`/`ext`/`core`/`e2e` and `{domain}` is `submitqueue`/`stovepipe`/… (omit the domain only for shared/cross-domain suites, e.g. `ext-queue-sql`). This keeps containers unambiguous and lets suites run in parallel. See [doc/howto/TESTING.md](doc/howto/TESTING.md#container-naming).
+- **Test compose contexts**: the `testContext` passed to `NewComposeStack` (and thus the `sq-test-{context}-…` Docker project/container names) must be **domain-qualified** — `{category}-{domain}-{name}` where `{category}` is `svc`/`ext`/`core`/`e2e` and `{domain}` is `submitqueue`/`stovepipe`/… (omit the domain only for shared/cross-domain suites, e.g. `ext-messagequeue-sql`). This keeps containers unambiguous and lets suites run in parallel. See [doc/howto/TESTING.md](doc/howto/TESTING.md#container-naming).
 - **README files**: Do not duplicate interface or type definitions as code blocks in READMEs. Describe behavior in prose and let readers navigate to the source. Only include code samples when explicitly instructed.
 - **Markdown prose width**: Do not hard-wrap prose in Markdown docs (RFCs under `doc/`, READMEs). Write one line per paragraph and one line per list item, and let the editor soft-wrap — hard wrapping at a fixed column renders as a narrow fixed-width column regardless of window size. Code blocks, tables, and ASCII diagrams keep their own line breaks.
 
@@ -241,7 +241,7 @@ To create a mock package for a new extension (e.g., `submitqueue/extension/newex
 3. Run `make mocks` to generate mock files into the new directory.
 4. Run `make gazelle` to create the `BUILD.bazel` file automatically.
 
-For inline mocks (mock in the same package, e.g., `extension/queue/mysql/mock_stores.go`):
+For inline mocks (mock in the same package, e.g., `extension/messagequeue/mysql/mock_stores.go`):
 
 1. Add a `//go:generate` directive with `-package=mypkg` and `-destination=mock_file.go`.
 2. Run `make mocks` and `make gazelle`.

Makefile

@@ -194,20 +194,20 @@ local-init-submitqueue-schemas: ## Manually apply all database schemas
 		docker exec -i $(SUBMITQUEUE_LOCAL_PROJECT)-mysql-app-1 mysql -uroot -proot submitqueue < $$file 2>&1 | grep -v "Using a password" || true; \
 	done
 	@echo "Applying counter schema to mysql-app..."
-	@for file in submitqueue/extension/counter/mysql/schema/*.sql; do \
+	@for file in extension/counter/mysql/schema/*.sql; do \
 		echo "  - Applying $$(basename $$file)..."; \
 		docker exec -i $(SUBMITQUEUE_LOCAL_PROJECT)-mysql-app-1 mysql -uroot -proot submitqueue < $$file 2>&1 | grep -v "Using a password" || true; \
 	done
 	@echo "Applying queue schema to mysql-queue..."
-	@for file in extension/queue/mysql/schema/*.sql; do \
+	@for file in extension/messagequeue/mysql/schema/*.sql; do \
 		echo "  - Applying $$(basename $$file)..."; \
 		docker exec -i $(SUBMITQUEUE_LOCAL_PROJECT)-mysql-queue-1 mysql -uroot -proot submitqueue < $$file 2>&1 | grep -v "Using a password" || true; \
 	done
 	@echo "✅ All schemas applied successfully"
 
 local-init-stovepipe-queue-schema: ## Apply queue schema only (mysql-queue) for Stovepipe compose stacks
 	@echo "Applying queue schema to mysql-queue (Stovepipe; no app storage/counter schema yet)..."
-	@for file in extension/queue/mysql/schema/*.sql; do \
+	@for file in extension/messagequeue/mysql/schema/*.sql; do \
 		echo "  - Applying $$(basename $$file)..."; \
 		docker exec -i $(STOVEPIPE_LOCAL_PROJECT)-mysql-queue-1 mysql -uroot -proot submitqueue < $$file 2>&1 | grep -v "Using a password" || true; \
 	done
@@ -334,7 +334,7 @@ local-stovepipe-gateway-start: build-stovepipe-gateway-linux ## Start Stovepipe
 
 mocks: ## Generate mock files using mockgen
 	@echo "Generating mocks..."
-	@$(BAZEL) run @rules_go//go -- generate ./submitqueue/extension/storage/... ./submitqueue/extension/buildrunner/... ./submitqueue/extension/changestore/... ./submitqueue/extension/counter/... ./extension/queue/... ./submitqueue/extension/queueconfig/... ./submitqueue/extension/mergechecker/... ./submitqueue/extension/pusher/... ./submitqueue/extension/scorer/... ./submitqueue/extension/conflict/... ./submitqueue/core/consumer/...
+	@$(BAZEL) run @rules_go//go -- generate ./submitqueue/extension/storage/... ./submitqueue/extension/buildrunner/... ./submitqueue/extension/changestore/... ./extension/counter/... ./extension/messagequeue/... ./submitqueue/extension/queueconfig/... ./submitqueue/extension/mergechecker/... ./submitqueue/extension/pusher/... ./submitqueue/extension/scorer/... ./submitqueue/extension/conflict/... ./submitqueue/core/consumer/...
 	@echo "Mocks generated successfully!"
 
 proto: ## Generate protobuf files from .proto definitions
@@ -381,7 +381,7 @@ run-client-stovepipe-orchestrator:
 	@$(BAZEL) run //example/stovepipe/orchestrator/client:orchestrator -- -addr $(or $(SERVER_ADDR),localhost:8084) -message "$(or $(MESSAGE),ping)"
 
 run-queue-admin: ## Run queue-admin CLI (use ARGS to pass arguments, e.g. make run-queue-admin ARGS="list-topics")
-	@$(BAZEL) run //extension/queue/mysql/ctl -- $(ARGS)
+	@$(BAZEL) run //extension/messagequeue/mysql/ctl -- $(ARGS)
 
 test: ## Run unit tests
 	@echo "Running unit tests..."

doc/howto/TESTING.md

@@ -23,13 +23,13 @@ SubmitQueue uses **two separate databases** to demonstrate proper architectural
 
 ### 1. Application Database
 - **Purpose**: Business data (requests, counters, batches)
-- **Schema**: `submitqueue/extension/storage/mysql/schema`, `submitqueue/extension/counter/mysql/schema`
+- **Schema**: `submitqueue/extension/storage/mysql/schema`, `extension/counter/mysql/schema`
 - **Used by**: Gateway (stores requests), Orchestrator (reads/updates request state)
 - **Connection**: `MYSQL_DSN`
 
 ### 2. Queue Database
 - **Purpose**: Messaging infrastructure (queue messages, offsets, partition leases)
-- **Schema**: `extension/queue/mysql/schema`
+- **Schema**: `extension/messagequeue/mysql/schema`
 - **Used by**: Gateway (publishes), Orchestrator (consumes)
 - **Connection**: `QUEUE_MYSQL_DSN`
 
@@ -128,7 +128,7 @@ The `{context}` passed to `NewComposeStack` is **domain-qualified** so that the
 - `{domain}` — `submitqueue`, `stovepipe`, … — **omit for shared/cross-domain code**
 - `{name}` — the specific service/extension (e.g. `gateway`, `storage-mysql`)
 
-Shared (cross-domain) suites carry no domain segment — e.g. the shared queue extension uses `ext-queue-sql`.
+Shared (cross-domain) suites carry no domain segment — e.g. the shared queue extension uses `ext-messagequeue-sql`.
 
 ### Context reference
 
@@ -138,9 +138,9 @@ Shared (cross-domain) suites carry no domain segment — e.g. the shared queue e
 | SubmitQueue orchestrator | `svc-submitqueue-orchestrator` | `sq-test-svc-submitqueue-orchestrator-xyz789-orchestrator-service-1` |
 | Stovepipe gateway | `svc-stovepipe-gateway` | `sq-test-svc-stovepipe-gateway-abc123-gateway-service-1` |
 | SubmitQueue storage extension | `ext-submitqueue-storage-mysql` | `sq-test-ext-submitqueue-storage-mysql-2ce1d0-mysql-1` |
-| SubmitQueue counter extension | `ext-submitqueue-counter-mysql` | `sq-test-ext-submitqueue-counter-mysql-…-mysql-1` |
+| Counter extension (shared) | `ext-counter-mysql` | `sq-test-ext-counter-mysql-…-mysql-1` |
 | SubmitQueue changestore extension | `ext-submitqueue-changestore-mysql` | `sq-test-ext-submitqueue-changestore-mysql-…-mysql-1` |
-| Shared queue extension | `ext-queue-sql` | `sq-test-ext-queue-sql-a1b2c3-mysql-1` |
+| Shared queue extension | `ext-messagequeue-sql` | `sq-test-ext-messagequeue-sql-a1b2c3-mysql-1` |
 | SubmitQueue consumer (core) | `core-submitqueue-consumer` | `sq-test-core-submitqueue-consumer-…-mysql-1` |
 | SubmitQueue e2e (full stack) | `e2e-submitqueue` | `sq-test-e2e-submitqueue-def456-gateway-service-1` |
 

doc/rfc/sql-queue-rfc.md

@@ -172,7 +172,7 @@ Messages are append-only. No per-message mutation during delivery.
 - `(topic, partition_key, offset)`: Core fetch query — poll messages in partition ordered by offset
 - `(topic, partition_key, id)`: Unique constraint and idempotent publish
 
-See `extension/queue/mysql/schema/queue_messages.sql` for full schema.
+See `extension/messagequeue/mysql/schema/queue_messages.sql` for full schema.
 
 ### Delivery State Table
 
@@ -184,7 +184,7 @@ Per-consumer-group delivery tracking with explicit ack state.
 - `invisible_until`: Visibility timeout in epoch milliseconds (only meaningful when `acked = FALSE`)
 - `retry_count`: Number of times message has been redelivered to this consumer group
 
-See `extension/queue/mysql/schema/queue_delivery_state.sql` for full schema.
+See `extension/messagequeue/mysql/schema/queue_delivery_state.sql` for full schema.
 
 ### Partition Leases Table
 
@@ -197,7 +197,7 @@ See `extension/queue/mysql/schema/queue_delivery_state.sql` for full schema.
 - `(leased_by)`: Find all partitions owned by a worker
 - `(lease_renewed_at)`: Detect stale leases across workers
 
-See `extension/queue/mysql/schema/queue_partition_leases.sql` for full schema.
+See `extension/messagequeue/mysql/schema/queue_partition_leases.sql` for full schema.
 
 ### Consumer Offsets Table
 
@@ -210,7 +210,7 @@ See `extension/queue/mysql/schema/queue_partition_leases.sql` for full schema.
 - `(consumer_group)`: Monitor all offsets for a consumer group
 - `(topic)`: Find all consumers for a topic
 
-See `extension/queue/mysql/schema/queue_offsets.sql` for full schema.
+See `extension/messagequeue/mysql/schema/queue_offsets.sql` for full schema.
 
 ### Subscriber Heartbeats Table
 
@@ -219,7 +219,7 @@ See `extension/queue/mysql/schema/queue_offsets.sql` for full schema.
 - `heartbeat_at`: Unix timestamp in milliseconds of last heartbeat
 - `deregistered_at`: Soft-delete timestamp (0 = active, >0 = deregistered during graceful shutdown)
 
-See `extension/queue/mysql/schema/queue_subscriber_heartbeats.sql` for full schema.
+See `extension/messagequeue/mysql/schema/queue_subscriber_heartbeats.sql` for full schema.
 
 ### Dead Letter Queue
 

entity/queue/BUILD.bazel entity/messagequeue/BUILD.bazelentity/queue/BUILD.bazel renamed to entity/messagequeue/BUILD.bazel

@@ -1,15 +1,15 @@
 load("@rules_go//go:def.bzl", "go_library", "go_test")
 
 go_library(
-    name = "queue",
+    name = "messagequeue",
     srcs = ["message.go"],
-    importpath = "github.com/uber/submitqueue/entity/queue",
+    importpath = "github.com/uber/submitqueue/entity/messagequeue",
     visibility = ["//visibility:public"],
 )
 
 go_test(
-    name = "queue_test",
+    name = "messagequeue_test",
     srcs = ["message_test.go"],
-    embed = [":queue"],
+    embed = [":messagequeue"],
     deps = ["@com_github_stretchr_testify//assert"],
 )

entity/queue/message.go entity/messagequeue/message.goentity/queue/message.go renamed to entity/messagequeue/message.go

@@ -12,7 +12,7 @@
 // See the License for the specific language governing permissions and
 // limitations under the License.
 
-package queue
+package messagequeue
 
 import (
 	"maps"

entity/queue/message_test.go entity/messagequeue/message_test.goentity/queue/message_test.go renamed to entity/messagequeue/message_test.go

@@ -12,7 +12,7 @@
 // See the License for the specific language governing permissions and
 // limitations under the License.
 
-package queue
+package messagequeue
 
 import (
 	"testing"

example/submitqueue/gateway/server/BUILD.bazel

@@ -11,9 +11,9 @@ go_library(
     importpath = "github.com/uber/submitqueue/example/submitqueue/gateway/server",
     visibility = ["//visibility:private"],
     deps = [
-        "//extension/queue/mysql",
+        "//extension/counter/mysql",
+        "//extension/messagequeue/mysql",
         "//submitqueue/core/consumer",
-        "//submitqueue/extension/counter/mysql",
         "//submitqueue/extension/queueconfig/yaml",
         "//submitqueue/extension/storage/mysql",
         "//submitqueue/gateway/controller",

example/submitqueue/gateway/server/main.go

@@ -28,9 +28,9 @@ import (
 
 	_ "github.com/go-sql-driver/mysql"
 	"github.com/uber-go/tally/v4"
-	queueMySQL "github.com/uber/submitqueue/extension/queue/mysql"
+	mysqlcounter "github.com/uber/submitqueue/extension/counter/mysql"
+	queueMySQL "github.com/uber/submitqueue/extension/messagequeue/mysql"
 	"github.com/uber/submitqueue/submitqueue/core/consumer"
-	mysqlcounter "github.com/uber/submitqueue/submitqueue/extension/counter/mysql"
 	yamlqueueconfig "github.com/uber/submitqueue/submitqueue/extension/queueconfig/yaml"
 	mysqlstorage "github.com/uber/submitqueue/submitqueue/extension/storage/mysql"
 	"github.com/uber/submitqueue/submitqueue/gateway/controller"