test(ci): resolve the office matrix contract instead of pinning its text

.github/workflows/ci.yml

@@ -4,19 +4,21 @@ on:
   push:
     branches: [main]
   pull_request:
+    types: [opened, synchronize, reopened, ready_for_review, converted_to_draft, closed]
 
 permissions:
   contents: read
 
 concurrency:
-  group: ${{ github.workflow }}-${{ github.repository }}-${{ github.event.pull_request.number || github.ref }}
-  cancel-in-progress: true
+  group: ${{ github.workflow }}-${{ github.repository }}-${{ github.event.pull_request.number || github.run_id }}
+  cancel-in-progress: ${{ github.event_name == 'pull_request' }}
 
 env:
   FORCE_JAVASCRIPT_ACTIONS_TO_NODE24: true
 
 jobs:
   build-and-test:
+    if: ${{ github.event_name != 'pull_request' || (!github.event.pull_request.draft && github.event.action != 'closed') }}
     runs-on: ubuntu-24.04
     timeout-minutes: 30
     steps:
@@ -51,6 +53,7 @@ jobs:
         run: pnpm build:demo
 
   browser-release-evidence:
+    if: ${{ github.event_name != 'pull_request' || (!github.event.pull_request.draft && github.event.action != 'closed') }}
     name: Cross-engine Clipboard / Playwright 1.62.0
     runs-on: ubuntu-24.04
     timeout-minutes: 60
@@ -84,6 +87,7 @@ jobs:
         run: pnpm --dir tests/browser exec playwright test --config playwright.config.ts
 
   office:
+    if: ${{ github.event_name != 'pull_request' || (!github.event.pull_request.draft && github.event.action != 'closed') }}
     name: Office / Python ${{ matrix.python-version }}
     runs-on: ubuntu-24.04
     timeout-minutes: 30

src/workflowExactHead.test.ts

@@ -45,6 +45,47 @@ function workflowJob(source: string, name: string, nextName?: string): string {
   return source.slice(start, end);
 }
 
+const SUPPORTED_PYTHON_VERSIONS = ['3.11', '3.12', '3.13', '3.14'] as const;
+
+/**
+ * Resolve every Python minor set the Office job can select, in declared order.
+ *
+ * The matrix may be written as a literal sequence or as an expression choosing
+ * between `fromJSON` payloads per event. Both are decoded to their values so
+ * this contract asserts the supported minors rather than the syntax that
+ * happens to express them, and so a legitimate reformatting of the workflow
+ * cannot turn the suite red on every candidate head at once.
+ */
+function officeMatrixPythonVersions(job: string): string[][] {
+  const declaration = /^\s*python-version:[ \t]*(?<value>\S.*?)\s*$/m.exec(job);
+  expect(
+    declaration,
+    `the office job declares no python-version matrix entry:\n${job}`,
+  ).not.toBeNull();
+  const value = declaration!.groups!.value;
+
+  const payloads = [...value.matchAll(/fromJSON\(\s*'(?<json>\[.*?\])'\s*\)/g)].map(
+    (match) => match.groups!.json,
+  );
+  const sources = payloads.length > 0 ? payloads : [value];
+
+  return sources.map((source) => {
+    let decoded: unknown;
+    try {
+      decoded = JSON.parse(source);
+    } catch {
+      throw new Error(
+        `the office python-version matrix is not resolvable to a version list; observed ${value}`,
+      );
+    }
+    expect(
+      Array.isArray(decoded) && decoded.length > 0,
+      `the office python-version matrix must resolve to a non-empty list; observed ${source}`,
+    ).toBe(true);
+    return (decoded as unknown[]).map(String);
+  });
+}
+
 /** Require checkout -> exact-SHA verification -> first consumer in one job. */
 function expectExactCheckoutBeforeConsumer(job: string, consumer: string): void {
   const checkout = job.indexOf(`- uses: ${CHECKOUT_PIN}`);
@@ -70,18 +111,76 @@ const officeJob = workflowJob(workflow, 'office');
 describe('exact-head CI workflow contract', () => {
   it('cancels only superseded runs for the same repository and PR while keeping full main compatibility coverage', () => {
     expect(workflow).toContain(
-      "group: ${{ github.workflow }}-${{ github.repository }}-${{ github.event.pull_request.number || github.ref }}",
+      "group: ${{ github.workflow }}-${{ github.repository }}-${{ github.event.pull_request.number || github.run_id }}",
     );
-    expect(workflow).toContain('cancel-in-progress: true');
-    expect(officeJob).toContain(
-      "python-version: ${{ github.event_name == 'pull_request' && fromJSON('[\"3.14\"]') || fromJSON('[\"3.11\", \"3.12\", \"3.13\", \"3.14\"]') }}",
+    expect(workflow).toContain(
+      "cancel-in-progress: ${{ github.event_name == 'pull_request' }}",
     );
+    const declaredMatrices = officeMatrixPythonVersions(officeJob);
+    for (const declared of declaredMatrices) {
+      const unsupported = declared.filter(
+        (version) => !SUPPORTED_PYTHON_VERSIONS.includes(version as never),
+      );
+      expect(
+        unsupported,
+        `the office python-version matrix declares unsupported entries in ${JSON.stringify(declared)}`,
+      ).toEqual([]);
+    }
+    expect(
+      declaredMatrices.at(-1),
+      'the exhaustive office python-version matrix must cover every supported minor in order',
+    ).toEqual([...SUPPORTED_PYTHON_VERSIONS]);
+    expect(
+      declaredMatrices[0],
+      'the office python-version matrix used for pull requests must include the newest supported minor',
+    ).toContain(SUPPORTED_PYTHON_VERSIONS.at(-1));
+
     expect(releaseWorkflow).toContain(
       'group: ${{ github.workflow }}-${{ github.repository }}-${{ github.ref_name }}',
     );
     expect(releaseWorkflow).toContain('cancel-in-progress: false');
   });
 
+  it('resolves the office matrix from its value rather than its spelling', () => {
+    const asJob = (declaration: string): string =>
+      `  office:\n    strategy:\n      matrix:\n        python-version: ${declaration}\n`;
+
+    const conditional =
+      '${{ github.event_name == \'pull_request\' && fromJSON(\'["3.14"]\') || fromJSON(\'["3.11", "3.12", "3.13", "3.14"]\') }}';
+    expect(officeMatrixPythonVersions(asJob(conditional))).toEqual([
+      ['3.14'],
+      ['3.11', '3.12', '3.13', '3.14'],
+    ]);
+
+    const reformatted =
+      '${{ github.event_name==\'pull_request\' && fromJSON( \'["3.13","3.14"]\' )  ||  fromJSON( \'["3.11","3.12","3.13","3.14"]\' ) }}';
+    expect(officeMatrixPythonVersions(asJob(reformatted))).toEqual([
+      ['3.13', '3.14'],
+      ['3.11', '3.12', '3.13', '3.14'],
+    ]);
+
+    expect(
+      officeMatrixPythonVersions(asJob('["3.11", "3.12", "3.13", "3.14"]')),
+    ).toEqual([['3.11', '3.12', '3.13', '3.14']]);
+
+    expect(() =>
+      officeMatrixPythonVersions('  office:\n    runs-on: ubuntu-24.04\n'),
+    ).toThrow(/declares no python-version matrix entry/);
+    expect(() =>
+      officeMatrixPythonVersions(asJob('${{ steps.resolve.outputs.versions }}')),
+    ).toThrow(/not resolvable to a version list/);
+  });
+
+  it('cancels stale PR work and skips inactive pull requests', () => {
+    expect(workflow).toContain(
+      'types: [opened, synchronize, reopened, ready_for_review, converted_to_draft, closed]',
+    );
+    for (const job of [buildJob, browserJob, officeJob]) {
+      expect(job).toContain('!github.event.pull_request.draft');
+      expect(job).toContain("github.event.action != 'closed'");
+    }
+  });
+
   it('uses a fixed runner and checks out the immutable current PR head in every job', () => {
     expect(workflow).not.toContain('ubuntu-latest');
     for (const job of [buildJob, browserJob, officeJob]) {