regenerate proto/grpc/cli, fix Looper NPE, Context auto-fill, and add E2E service tests

Regenerate all proto, gRPC server/client, and CLI code from updated specs
using the full generation pipeline (proto → protoc → grpc → cli).

Fixes:
- Add gRPC Looper interceptor that pins handler goroutines to OS threads,
  attaches to the JVM, and calls Looper.prepare() before handlers execute.
  Fixes NPEs in InputMethodManager, WindowManager, and other services that
  create Handlers internally. Use prepareMainLooper() in initAndroidContext.
- Auto-fill android.content.Context parameters in generated server code
  from s.Ctx.Obj instead of requiring a client-side handle. Fixes NPE in
  DownloadManager.getMaxBytesOverMobile and similar static methods.
- Fall back to /data/local/tmp/ in microphone/camera record commands when
  getCacheDir() fails (package "android" has no data directory).

Add comprehensive E2E service tests (tests/e2e-grpc/services_test.go)
covering 32 working services, expected-error cases, and unimplemented
service detection.

Author: xaionaro@dx.center

.gitignore

@@ -6,3 +6,5 @@ cover.out
 examples/test_results/
 go.work
 go.work.sum
+jnicli
+build/

.golangci.yml

@@ -0,0 +1,12 @@
+version: "2"
+
+run:
+  timeout: 5m
+
+linters:
+  enable:
+    - govet
+    - staticcheck
+    - errcheck
+    - ineffassign
+    - unused

Makefile

@@ -1,17 +1,48 @@
-.PHONY: generate callbacks clean lint test test-e2e test-emulator \
+.PHONY: generate callbacks proto protoc grpc cli clean lint test test-tools test-e2e test-emulator \
 	build build-server list-commands dist dist-jnicli-linux dist-jnicli-android dist-jniserviceadmin dist-jniservice dist-dex \
 	magisk apk deploy push start-server stop-server forward
 
+# Path to the jni repo checkout (sibling directory by default).
+JNI_DIR ?= ../jni
+
 # Android SDK platform JAR for specgen.
 ANDROID_JAR ?= $(ANDROID_HOME)/platforms/android-36/android.jar
 
-# Run callbackgen — generates Java callback adapter classes
-generate: callbacks
+# Run all generators
+generate: callbacks proto protoc grpc cli
 
 # Run callbackgen — generates Java callback adapter classes
 callbacks:
 	go run ./tools/cmd/callbackgen/
 
+# Run protogen — generates .proto files from Java API specs
+proto:
+	go run ./tools/cmd/protogen/ -specs $(JNI_DIR)/spec/java/ -overlays $(JNI_DIR)/spec/overlays/java/ -output proto/ -go-module github.com/AndroidGoLab/jni-proxy
+	@mkdir -p proto/handlestore
+	@cp $(JNI_DIR)/spec/handlestore.proto proto/handlestore/handlestore.proto
+
+# Run protoc — compiles .proto files to Go stubs
+protoc: proto
+	@command -v protoc >/dev/null 2>&1 || { echo "protoc not found. Install: https://grpc.io/docs/protoc-installation/"; exit 1; }
+	@for dir in proto/*/; do \
+		pkg=$$(basename "$$dir"); \
+		protoc -I. --go_out=. --go_opt=paths=source_relative \
+			--go-grpc_out=. --go-grpc_opt=paths=source_relative \
+			"$$dir$$pkg.proto"; \
+	done
+
+# Run grpcgen — generates gRPC server and client wrappers
+grpc: protoc
+	go run ./tools/cmd/grpcgen/ -specs $(JNI_DIR)/spec/java/ -overlays $(JNI_DIR)/spec/overlays/java/ -output . -go-module github.com/AndroidGoLab/jni-proxy -jni-module github.com/AndroidGoLab/jni
+
+# Run cligen — generates jnicli cobra commands from Java API specs
+cli: grpc
+	go run ./tools/cmd/cligen/ -specs $(JNI_DIR)/spec/java/ -overlays $(JNI_DIR)/spec/overlays/java/ -output cmd/jnicli/ -go-module github.com/AndroidGoLab/jni-proxy
+
+# Run only tool tests (no JDK needed)
+test-tools:
+	go test ./tools/...
+
 # List all jnicli leaf commands as full paths
 list-commands:
 	@go run ./cmd/jnicli/ list-commands