perf(tests): reuse CLI compilation for exported binding checks

Reuse the existing CLI compilation policy in the exported binding acceptance
matrix. Own and clean a fresh cache per file while preserving caller cache
and coverage choices, all 92 cases, and every live CLI/MCP request and oracle.

Fixes #4079

Co-authored-by: Kaoru0822 <208281322+kaoru0822-kitauji@users.noreply.github.com>

tests/support/cli/cliFixture.ts

@@ -40,6 +40,17 @@ const parseJson = (stdout: string): unknown | undefined => {
   }
 };
 
+/** Reuse CLI compilation without overriding caller-selected cache or coverage. */
+export const cliCompileCacheEnvironment = (
+  environment: NodeJS.ProcessEnv | undefined,
+  compileCache?: string,
+): NodeJS.ProcessEnv => ({
+  ...(compileCache === undefined || environment?.NODE_V8_COVERAGE !== undefined
+    ? {}
+    : { NODE_COMPILE_CACHE: compileCache }),
+  ...environment,
+});
+
 /** Create a compiled CLI driver backed by the supplied process registry. */
 export const createTestCli = (
   processes: TestProcesses,
@@ -68,11 +79,7 @@ export const createTestCli = (
                 TMP: tmpdir(),
               }
             : {}),
-          ...(compileCache === undefined ||
-          environment?.NODE_V8_COVERAGE !== undefined
-            ? {}
-            : { NODE_COMPILE_CACHE: compileCache }),
-          ...environment,
+          ...cliCompileCacheEnvironment(environment, compileCache),
         },
         ...(input === undefined ? {} : { input }),
         ...(timeoutMs === undefined ? {} : { timeoutMs }),