refactor(runway): rename vcs extension to merger

Rename runway/extension/vcs/ to runway/extension/merger/ per review
feedback. Package, file, and mock names updated accordingly.

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

Author: kevinlnew

runway/extension/vcs/BUILD.bazel runway/extension/merger/BUILD.bazelrunway/extension/vcs/BUILD.bazel renamed to runway/extension/merger/BUILD.bazel

@@ -1,9 +1,9 @@
 load("@rules_go//go:def.bzl", "go_library")
 
 go_library(
-    name = "vcs",
-    srcs = ["vcs.go"],
-    importpath = "github.com/uber/submitqueue/runway/extension/vcs",
+    name = "merger",
+    srcs = ["merger.go"],
+    importpath = "github.com/uber/submitqueue/runway/extension/merger",
     visibility = ["//visibility:public"],
     deps = ["//api/runway/messagequeue"],
 )

runway/extension/vcs/vcs.go runway/extension/merger/merger.gorunway/extension/vcs/vcs.go renamed to runway/extension/merger/merger.go

@@ -12,13 +12,13 @@
 // See the License for the specific language governing permissions and
 // limitations under the License.
 
-// Package vcs defines the pluggable interface for version-control operations
-// that Runway performs on behalf of its callers. Implementations resolve change
-// URIs, apply changes to a target branch, and (for a committing merge) push the
-// result and finalize the change lifecycle (e.g. close PRs).
-package vcs
+// Package merger defines the pluggable interface for version-control merge
+// operations that Runway performs on behalf of its callers. Implementations
+// resolve change URIs, apply changes to a target branch, and (for a committing
+// merge) push the result and finalize the change lifecycle (e.g. close PRs).
+package merger
 
-//go:generate mockgen -source=vcs.go -destination=mock/vcs_mock.go -package=mock
+//go:generate mockgen -source=merger.go -destination=mock/merger_mock.go -package=mock
 
 import (
 	"context"

runway/extension/vcs/mock/BUILD.bazel runway/extension/merger/mock/BUILD.bazelrunway/extension/vcs/mock/BUILD.bazel renamed to runway/extension/merger/mock/BUILD.bazel

@@ -2,12 +2,12 @@ load("@rules_go//go:def.bzl", "go_library")
 
 go_library(
     name = "mock",
-    srcs = ["vcs_mock.go"],
-    importpath = "github.com/uber/submitqueue/runway/extension/vcs/mock",
+    srcs = ["merger_mock.go"],
+    importpath = "github.com/uber/submitqueue/runway/extension/merger/mock",
     visibility = ["//visibility:public"],
     deps = [
         "//api/runway/messagequeue",
-        "//runway/extension/vcs",
+        "//runway/extension/merger",
         "@org_uber_go_mock//gomock",
     ],
 )

runway/extension/vcs/mock/vcs_mock.go …way/extension/merger/mock/merger_mock.gorunway/extension/vcs/mock/vcs_mock.go renamed to runway/extension/merger/mock/merger_mock.go runway/extension/vcs/mock/vcs_mock.go renamed to runway/extension/merger/mock/merger_mock.go

@@ -3,12 +3,12 @@ load("@rules_go//go:def.bzl", "go_library", "go_test")
 go_library(
     name = "noop",
     srcs = ["noop.go"],
-    importpath = "github.com/uber/submitqueue/runway/extension/vcs/noop",
+    importpath = "github.com/uber/submitqueue/runway/extension/merger/noop",
     visibility = ["//visibility:public"],
     deps = [
         "//api/runway/messagequeue",
         "//api/runway/messagequeue/protopb",
-        "//runway/extension/vcs",
+        "//runway/extension/merger",
     ],
 )
 

runway/extension/vcs/noop/BUILD.bazel runway/extension/merger/noop/BUILD.bazelrunway/extension/vcs/noop/BUILD.bazel renamed to runway/extension/merger/noop/BUILD.bazel

@@ -24,10 +24,10 @@ import (
 
 	runwaymq "github.com/uber/submitqueue/api/runway/messagequeue"
 	runwaypb "github.com/uber/submitqueue/api/runway/messagequeue/protopb"
-	"github.com/uber/submitqueue/runway/extension/vcs"
+	"github.com/uber/submitqueue/runway/extension/merger"
 )
 
-var _ vcs.Merger = (*Merger)(nil)
+var _ merger.Merger = (*Merger)(nil)
 
 // Merger is a no-op implementation that always succeeds.
 type Merger struct {