test(ci): bind npm cache IDs to output consumers

Remove the blanket caller ID requirement that rejected the standalone mutation workflow. Keep producer bindings where static cache authorization and package verification consume action outputs.

tests/boundary/filesystem/ciCachePolicy.test.ts

@@ -169,7 +169,6 @@ printf '%s\n' 'C:\Users\runner with spaces\AppData\Local\npm-cache'
           const step = steps[index];
           if (step?.uses !== "./.github/actions/npm-cache") continue;
           npmCacheSteps++;
-          expect(step.id).toBe("npm-cache");
           const setup = steps[index - 1];
           expect(
             typeof setup?.uses === "string" &&
@@ -198,6 +197,9 @@ it("shares static task snapshots only after validation using the npm cache owner
   const workflows = await readWorkflows();
   const ci = workflows.find(({ file }) => file === "ci.yml");
   const steps = ci?.workflow.jobs?.static?.steps ?? [];
+  expect(
+    steps.find((step) => step.uses === "./.github/actions/npm-cache")?.id,
+  ).toBe("npm-cache");
   const restore = steps.find((step) => step.id === "static-cache");
   const save = steps.find(
     (step) => step.name === "Save validated static task cache",
@@ -221,6 +223,24 @@ it("shares static task snapshots only after validation using the npm cache owner
   );
 });
 
+it("passes the npm cache owner's selected path to package installation", async () => {
+  const workflows = await readWorkflows();
+  const ci = workflows.find(({ file }) => file === "ci.yml");
+  const steps = ci?.workflow.jobs?.["package-e2e"]?.steps ?? [];
+  const cacheIndex = steps.findIndex(
+    (step) => step.uses === "./.github/actions/npm-cache",
+  );
+  expect(steps[cacheIndex]?.id).toBe("npm-cache");
+  const consumerIndex = steps.findIndex(
+    (step) => step.run === "npm run verify:package",
+  );
+  expect(consumerIndex).toBeGreaterThan(cacheIndex);
+  expect(
+    z.record(z.string(), z.unknown()).parse(steps[consumerIndex]?.env)
+      .npm_config_cache,
+  ).toBe("${{ steps.npm-cache.outputs.path }}");
+});
+
 it("bounds the rolling static snapshot with Turbo age and size eviction", async () => {
   const turbo = z
     .object({