docs: Remove sibling product and lab path leaks

Outsiders reading this module should not see private sibling
names (tradey), unfinished rewire notes, or /fast/projects
lab paths. Keep the library self-contained in README, design,
plan, and test fixtures/identity strings.

auth/oauth_test.go

@@ -3,8 +3,8 @@ package auth
 import "testing"
 
 func TestOAuthIdentity(t *testing.T) {
-	gotN, gotV := oauthIdentity(Config{Name: "tradey", Version: "0.9"})
-	if gotN != "tradey" || gotV != "0.9" {
+	gotN, gotV := oauthIdentity(Config{Name: "example-app", Version: "0.9"})
+	if gotN != "example-app" || gotV != "0.9" {
 		t.Fatalf("%s %s", gotN, gotV)
 	}
 	gotN, gotV = oauthIdentity(Config{})