feat(unified-env-remove-callmap): clean up 'direct mode' references in env tests

Remove outdated 'direct mode' terminology from test descriptions
since there is now only one invocation path (registry.execute).
The callMap option was removed from buildEnv() in previous tasks.

test/env.test.ts

@@ -20,7 +20,7 @@ function makeOperation(name: string, handler?: any): IOperationDefinition {
 }
 
 describe("buildEnv", () => {
-  it("creates namespace-keyed env in direct mode", async () => {
+  it("creates namespace-keyed env", async () => {
     const registry = new OperationRegistry();
     registry.register(makeOperation("readFile"));
     registry.register(makeOperation("writeFile"));
@@ -40,7 +40,7 @@ describe("buildEnv", () => {
     expect(result.data).toEqual({ result: "test" });
   });
 
-  it("returns ResponseEnvelope with local source from direct mode", async () => {
+  it("returns ResponseEnvelope with local source", async () => {
     const registry = new OperationRegistry();
     registry.register(makeOperation("op1"));
 
@@ -59,7 +59,7 @@ describe("buildEnv", () => {
     expect(result.data).toEqual({ result: "hello" });
   });
 
-  it("passes pre-built ResponseEnvelope through from handler in direct mode", async () => {
+  it("passes pre-built ResponseEnvelope through from handler", async () => {
     const registry = new OperationRegistry();
     const httpEnv = httpEnvelope({ items: [1, 2, 3] }, {
       statusCode: 200,
@@ -245,7 +245,7 @@ describe("buildEnv", () => {
     expect(env.other.op2).toBeDefined();
   });
 
-  it("Value.Cast normalization applies in direct mode via execute", async () => {
+  it("applies Value.Cast normalization via execute", async () => {
     const registry = new OperationRegistry();
     registry.register({
       name: "withDefaults",