test(ci-image): name Dockerfile.ci in a form pregate resolves; assert the image hash in the parity case

Co-authored-by: capy-ai[bot] <230910855+capy-ai[bot]@users.noreply.github.com>

CHANGELOG.md

@@ -11,9 +11,10 @@
 ### Tests
 - `test/ci-image-cli-pin.test.ts` gains four cases: Dockerfile.ci pins an exact Node version and a SHA-256, both files verify before they unpack, and `setup-free-suite.sh` pins the same version and hash as the image. On #3355's head alone, all four fail; on main, three fail.
 - The Bun ordering check in `setup-free-suite.sh` now looks for `sha256sum -c` after the Bun download instead of anywhere in the file, because the Node check now comes first.
+- The test names `Dockerfile.ci` as `join(__dirname, '..', '.github', …)`, the form pregate's literal scan resolves, so a change to the image now selects it (before, pregate refused a Dockerfile.ci-only change with `PREGATE_NO_LANE`).
 
 ### Gate integrity
-- One accepted-input change to review: the Bun ordering check searches for its `sha256sum -c` from the Bun download onward. A file whose only `sha256sum -c` sits before the download still fails, and so does removing the Bun hash or moving it after `unzip` (negative controls run). No threshold, budget, timeout, trial count or case kind changed.
+- One accepted-input change to review: the Bun ordering check searches for its `sha256sum -c` from the Bun download onward. It now accepts one input it used to reject: a file with some other `sha256sum -c` before the Bun download and the Bun check after it, which is this file. The property it guards, Bun verified after download and before unpack, is unchanged. A file whose only `sha256sum -c` sits before the download still fails, and so does removing the Bun hash or moving it after `unzip` (negative controls run). No threshold, budget, timeout, trial count or case kind changed.
 
 ## [1.91.191.0] - 2026-10-25
 

test/ci-image-cli-pin.test.ts

@@ -24,7 +24,7 @@ import * as fs from 'node:fs';
 import * as path from 'node:path';
 
 const ROOT = path.resolve(__dirname, '..');
-const DOCKERFILE = path.join(ROOT, '.github', 'docker', 'Dockerfile.ci');
+const DOCKERFILE = path.join(__dirname, '..', '.github', 'docker', 'Dockerfile.ci');
 
 /** Package specs from every `npm i -g` / `npm install -g` in the Dockerfile. */
 export function globalNpmInstallSpecs(source: string): string[] {
@@ -242,6 +242,7 @@ describe('CI Node.js installs match the image and are verified (#3354)', () => {
   const source = fs.readFileSync(path.join(ROOT, rel), 'utf-8');
 
   test(`${rel} pins the same Node.js version and SHA-256 as Dockerfile.ci`, () => {
+    expect(imageSha).toMatch(/^[0-9a-f]{64}$/);
     expect(source.match(/^NODE_VERSION=(\S+)$/m)?.[1]).toBe(imageVersion!);
     expect(source.match(/^NODE_SHA256=(\S+)$/m)?.[1]).toBe(imageSha!);
   });