chore(cursor-proxy-debugger): enhance traffic capture for Fork Chat and update README

- Added support for capturing and decoding Fork Chat traffic, including `ForkBackgroundComposer`, `NotifyConversationClone`, and `UploadConversationBlobs`.
- Updated the README to reflect new features and usage instructions for Fork Chat traffic.
- Modified `.gitignore` to include `proto/extensions-cursor-app/`.
- Refactored `Taskfile.yml` to improve error messages related to Cursor extensions.
- Introduced new tests for decoding functionality in `cursor-proxy-debugger`.

proto/ext_tool/extractor_test.go

@@ -0,0 +1,72 @@
+package main
+
+import "testing"
+
+func TestParseFieldObjectSupportsShorthandType(t *testing.T) {
+	field, err := parseFieldObject(`{no:4,name:"file_not_found",kind:"message",T,oneof:"result"}`)
+	if err != nil {
+		t.Fatalf("parse shorthand T: %v", err)
+	}
+	if field.T != "T" {
+		t.Fatalf("parsed shorthand T as %#v, want T", field.T)
+	}
+}
+
+func TestWebpackExportAliasResolvesServiceMessageType(t *testing.T) {
+	const bundle = `
+1:(e,t,n)=>{
+  n.d(t,{KS:()=>T,_B:()=>r});
+  var r;
+  class T {}
+  T.typeName="agent.v1.AgentClientMessage";
+  n.proto3.util.setEnumType(r,"agent.v1.DiagnosticSeverity",[]);
+},
+2:(e,t,n)=>{
+  var r=n(1);
+  const service={typeName:"agent.v1.AgentService",methods:{run:{name:"Run",I:r.KS,O:r.KS,kind:n.MethodKind.BiDiStreaming}}};
+}`
+
+	moduleStarts := buildModuleStarts(bundle)
+	messages := []Message{{
+		TypeName:     "agent.v1.AgentClientMessage",
+		VarName:      "T",
+		InternalName: "T",
+		Package:      "agent.v1",
+		Pos:          35,
+		ModuleStart:  moduleStartForPos(moduleStarts, 35),
+	}}
+	enums := []Enum{{
+		TypeName:    "agent.v1.DiagnosticSeverity",
+		VarName:     "r",
+		Package:     "agent.v1",
+		Pos:         100,
+		ModuleStart: moduleStartForPos(moduleStarts, 100),
+	}}
+
+	resolver := newTypeResolver(messages, enums, buildAliasIndex(bundle, moduleStarts), buildWebpackExportAliasIndex(bundle, moduleStarts))
+	resolver.moduleImports = buildModuleImportIndex(bundle, moduleStarts)
+	typeName, ok := resolver.ResolveTypeName("r.KS", len(bundle)-1, moduleStartForPos(moduleStarts, len(bundle)-1), "agent.v1", "message")
+	if !ok {
+		t.Fatal("expected webpack export alias to resolve")
+	}
+	if typeName != "agent.v1.AgentClientMessage" {
+		t.Fatalf("resolved r.KS to %q, want agent.v1.AgentClientMessage", typeName)
+	}
+}
+
+func TestResolverPrefersExpectedKindOverCurrentPackage(t *testing.T) {
+	resolver := &TypeResolver{bySymbol: map[string][]symbolDef{
+		"nt": {
+			{TypeName: "git_forge.v1.GetTagResponse", Kind: "message", Pos: 10, ModuleStart: 1},
+			{TypeName: "origin.v1.TeamGroupKind", Kind: "enum", Pos: 20, ModuleStart: 1},
+		},
+	}}
+
+	typeName, ok := resolver.ResolveTypeName("nt", 30, 1, "origin.v1", "message")
+	if !ok {
+		t.Fatal("expected cross-package message type to resolve")
+	}
+	if typeName != "git_forge.v1.GetTagResponse" {
+		t.Fatalf("resolved nt to %q, want git_forge.v1.GetTagResponse", typeName)
+	}
+}