Remove dead grpc-gateway and zipkin swagger artifacts (#197)

- Remove grpc-gateway protoc step for api_v3: the generated .pb.gw.go
goes to a gitignored directory and is not published or used by Jaeger,
which implements HTTP-to-gRPC transcoding manually.
- Remove proto/api_v3/query_service_http.yaml: it was only used by the
grpc-gateway step and is now fully superseded by inline google.api.http
annotations in the proto file.
- Remove swagger/zipkin2-api.yaml and its swagger-validate target: the
file is an upstream copy validated only as a sanity check; no artifact
is produced or consumed by Jaeger from it.
- Remove SWAGGER/SWAGGER_VER/SWAGGER_IMAGE vars and PROTOC_INTERNAL var,
which are now unused.

## AI Usage in this PR (choose one)
- [x] **Heavy**: AI generated most or all of the code changes

---------

Signed-off-by: Yuri Shkuro <github@ysh.us>
Co-authored-by: Claude Sonnet 4.6 <noreply@anthropic.com>

Author: yurishkuro

AGENTS.md

@@ -19,6 +19,10 @@ The project uses a `Makefile` that heavily relies on Docker (specifically `jaege
     -   Removes unused schemas (e.g., transitively imported Gnostic types).
     -   Patches duplicate `operationId`s (e.g., `QueryService_FindTraces` -> `QueryService_FindTracesPost`).
 
+## Git sign-off
+
+When committing always include -s flag for sign-off footer.
+
 ## Working with GitHub CLI (`gh`)
 
 To effectively gather context from Pull Requests, especially for review comments:

Makefile

@@ -8,9 +8,6 @@ THRIFT_VER?=0.19
 THRIFT_IMG?=jaegertracing/thrift:$(THRIFT_VER)
 THRIFT=docker run --rm -u $(shell id -u) -v "${PWD}:/data" $(THRIFT_IMG) thrift
 
-SWAGGER_VER=0.31.0
-SWAGGER_IMAGE=quay.io/goswagger/swagger:$(SWAGGER_VER)
-SWAGGER=docker run --rm -u ${shell id -u} -v "${PWD}:/go/src/${PROJECT_ROOT}" -w /go/src/${PROJECT_ROOT} $(SWAGGER_IMAGE)
 
 PROTOC_VER=0.5.1
 PROTOC_IMAGE=jaegertracing/protobuf:$(PROTOC_VER)
@@ -71,13 +68,9 @@ $(PRUNE_OPENAPI): $(TOOLS_BIN_DIR)
 	cd $(TOOLS_MOD_DIR) && go build -o $@ ./prune-openapi
 
 .PHONY: test-code-gen
-test-code-gen: thrift-all swagger-validate proto-all proto-zipkin
-	git diff --exit-code ./swagger/api_v3/query_service.swagger.json
+test-code-gen: thrift-all proto-all proto-zipkin
 	git diff --exit-code ./swagger/api_v3/query_service.openapi.yaml
 
-.PHONY: swagger-validate
-swagger-validate:
-	$(SWAGGER) validate ./swagger/zipkin2-api.yaml
 
 .PHONY: clean
 clean:
@@ -170,10 +163,6 @@ PROTOC_WITH_GRPC := $(PROTOC_WITH_GRPC_common) \
 		--grpc-csharp_out=${PROTO_GEN_CSHARP_DIR_POLYGLOT}
 endif
 
-PROTOC_INTERNAL := $(PROTOC) \
-		$(PROTO_INCLUDES) \
-		--csharp_out=internal_access,base_namespace:${PROTO_GEN_CSHARP_DIR_POLYGLOT} \
-		--python_out=${PROTO_GEN_PYTHON_DIR_POLYGLOT}
 
 GO=go
 GOOS ?= $(shell $(GO) env GOOS)
@@ -313,23 +302,6 @@ proto-api-v3-all:
 	# API v3
 	$(PROTOC_WITH_GRPC) \
 		proto/api_v3/query_service.proto
-	# GRPC gateway
-	$(PROTOC) \
-		$(PROTO_INCLUDES) \
- 		--grpc-gateway_out=logtostderr=true,grpc_api_configuration=proto/api_v3/query_service_http.yaml,$(PROTO_GOGO_MAPPINGS):${PROTO_GEN_GO_DIR_POLYGLOT} \
-		proto/api_v3/query_service.proto
-	# Swagger
-	$(PROTOC) \
-		$(PROTO_INCLUDES) \
-		--swagger_out=disable_default_errors=true,logtostderr=true,grpc_api_configuration=proto/api_v3/query_service_http.yaml:./swagger \
-		proto/api_v3/query_service.proto
-
-	$(PROTOC_INTERNAL) \
-		google/api/annotations.proto \
-		google/api/http.proto \
-		protoc-gen-swagger/options/annotations.proto \
-		protoc-gen-swagger/options/openapiv2.proto \
-		gogoproto/gogo.proto
 	# OpenAPI v3
 	$(MAKE) proto-api-v3-openapi