fix(workspace): isolate maintenance authentication surface

backend/src/config.ts

@@ -176,7 +176,11 @@ function positiveDimension(value: string | undefined, fallback: number): number
   return parsed;
 }
 
-export function loadConfig(env: Record<string, string | undefined>): AppConfig {
+export function loadConfig(
+  env: Record<string, string | undefined>,
+  options: { surface?: "application" | "workspace-maintenance" } = {},
+): AppConfig {
+  const applicationSurface = options.surface !== "workspace-maintenance";
   const defaultAuthConfigFile = "/run/thothii-auth/auth.yaml";
   const authConfigFile = absoluteAuthPath(env.THT_AUTH_CONFIG_FILE ?? defaultAuthConfigFile, "file");
   const authStateRoot = absoluteAuthPath(env.THT_AUTH_STATE_ROOT ?? "/data/auth", "state root");
@@ -211,13 +215,13 @@ export function loadConfig(env: Record<string, string | undefined>): AppConfig {
       throw new Error(`unsupported AUTH_MODE=${requestedMode}; use none, mock, or upstream`);
     }
     const nodeEnvironment = env.NODE_ENV ?? process.env.NODE_ENV;
-    if ((requestedMode === "none" || requestedMode === "mock")
+    if (applicationSurface && (requestedMode === "none" || requestedMode === "mock")
       && nodeEnvironment !== "development" && nodeEnvironment !== "test") {
       throw new Error("production requires auth.yaml or AUTH_MODE=upstream");
     }
     authMode = requestedMode as "none" | "mock" | "upstream";
   }
-  const publicExposure = env.THOTH_PUBLIC_EXPOSURE === "true";
+  const publicExposure = applicationSurface && env.THOTH_PUBLIC_EXPOSURE === "true";
   if (publicExposure && authMode !== "oidc" && authMode !== "upstream") {
     throw new Error("public exposure requires AUTH_MODE=upstream or configured OIDC behind a trusted proxy");
   }

backend/src/workspace-maintenance.ts

@@ -212,7 +212,7 @@ async function readSessionInventory(dataRoot: string, workspaceId: string): Prom
 }
 
 function createProductionService(): WorkspacePreprocessingService {
-  const config = loadConfig(process.env);
+  const config = loadConfig(process.env, { surface: "workspace-maintenance" });
   const registry = new WorkspaceRegistry(config.workspaceRegistry);
   const workspaceSecretStore = new WorkspaceSecretStore({
     root: config.workspaceSecretStoreRoot,

backend/test/config.test.ts

@@ -97,6 +97,17 @@ test("loadConfig allows none and mock only outside production when auth.yaml is
     .toThrow("production requires auth.yaml or AUTH_MODE=upstream");
 });
 
+test("workspace maintenance loads production configuration without an authentication surface", () => {
+  expect(loadConfig(
+    { NODE_ENV: "production", THOTH_PUBLIC_EXPOSURE: "true" },
+    { surface: "workspace-maintenance" },
+  )).toMatchObject({
+    authMode: "none",
+    authentication: undefined,
+    publicExposure: false,
+  });
+});
+
 test("local Compose profiles explicitly select the development auth environment", () => {
   for (const profile of ["../../deploy/compose.local.yaml", "../../docker-compose.dev.yml"]) {
     expect(readFileSync(new URL(profile, import.meta.url), "utf8")).toMatch(/NODE_ENV:\s*development/);