fix(signals): classify Java gRPC service stubs as generated

Recognize grpc-java *Grpc.java service stubs in isGeneratedFile so
generated-only diffs classify correctly for slop signals and the
changed-files summary path-matcher dependency.

Co-authored-by: Cursor <cursoragent@cursor.com>

Author: jimcody1995

src/signals/path-matchers.ts

@@ -56,11 +56,13 @@ function isGeneratedFileFrom(parts: NormalizedPath): boolean {
     // the Elixir plugin emits `.pb.ex`, the Erlang gpb plugin emits `.pb.erl` / `.pb.hrl`, the Crystal
     // plugin emits `.pb.cr`, the Haskell plugin emits `.pb.hs`, and the Objective-C plugin emits
     // `.pbobjc.{h,m}` plus gRPC `.pbrpc.{h,m}` service stubs. Swift gRPC emits sibling `.grpc.swift`
-    // service stubs; grpc-kotlin emits sibling `*GrpcKt.kt` coroutine service stubs.
+    // service stubs; grpc-kotlin emits sibling `*GrpcKt.kt` coroutine service stubs; grpc-java emits
+    // sibling `*Grpc.java` service stubs.
     // `.pb.dart`/`.pb.kt`/`.pb.cs` (the `.pb` infix keeps hand-written sources from matching).
     /\.pb\.(go|ts|js|cc|h|swift|dart|kt|cs|rs|ex|erl|hrl|cr|hs)$/.test(norm) ||
     /\.grpc\.swift$/.test(norm) ||
     /grpckt\.kt$/.test(norm) ||
+    /grpc\.java$/.test(norm) ||
     /\.pbobjc\.(h|m)$/.test(norm) ||
     /\.pbrpc\.(h|m)$/.test(norm) ||
     // Python protobuf: message stubs are `*_pb2.py[i]`; the gRPC plugin emits sibling

test/unit/path-matchers.test.ts

@@ -144,6 +144,12 @@ describe("isGeneratedFile", () => {
     expect(classifyChangedFile("gen/GreeterGrpcKt.kt")).toBe("generated");
   });
 
+  it("matches Java gRPC service stubs alongside the other protoc plugins", () => {
+    expect(isGeneratedFile("gen/GreeterGrpc.java")).toBe(true);
+    expect(isGeneratedFile("src/Greeter.java")).toBe(false);
+    expect(classifyChangedFile("gen/GreeterGrpc.java")).toBe("generated");
+  });
+
   it("matches JavaScript and TypeScript grpc-node protobuf stubs alongside the other protoc plugins", () => {
     expect(isGeneratedFile("gen/service_pb.js")).toBe(true);
     expect(isGeneratedFile("gen/service_grpc_pb.js")).toBe(true);
@@ -488,6 +494,7 @@ describe("classifyChangedFile", () => {
       ["gen/service_pb.nim", "generated"],
       ["gen/service_pb.lua", "generated"],
       ["gen/GreeterGrpcKt.kt", "generated"],
+      ["gen/GreeterGrpc.java", "generated"],
       ["gen/service_grpc_pb.js", "generated"],
       ["gen/service_pb.d.ts", "generated"],
       ["vendor/lib.go", "vendored"],