fix(ops): scope check-in CI reads to main branch runs

scripts/tools/daily-checkin-data.mjs

@@ -13,6 +13,7 @@ import {
   parseWorkflowName,
   readMigrationState,
   refreshProductionRef,
+  runListArgs,
   summarizeWorkflowRuns,
 } from './daily-checkin-observability.mjs'
 import { ghEnv, runReadOnlyProcess, subprocessEnv } from './daily-checkin-process.mjs'
@@ -118,8 +119,6 @@ const deploy = probe(() => {
   }
 })
 
-const runFields = 'databaseId,workflowName,displayTitle,headSha,status,conclusion,createdAt,updatedAt,url'
-
 const ci = probe(() => {
   const workflowDir = join(root, '.github/workflows')
   const definedWorkflows = readdirSync(workflowDir)
@@ -130,12 +129,14 @@ const ci = probe(() => {
   // A low-cadence workflow can fall outside a flat recent-runs page, and an
   // absent row reads as `missing`, which is an observability gap rather than a
   // health signal. Each workflow is therefore paged on its own name, and paged
-  // deeper when a run of skipped guard runs hides the last verdict.
+  // deeper when a run of skipped guard runs hides the last verdict. runListArgs
+  // scopes every read to main, so a PR branch failure cannot masquerade as the
+  // main gate verdict.
   const perWorkflowRows = collectWorkflowRuns(
-    (name, limit) => commandJson('gh', ['run', 'list', '--workflow', name, '--limit', String(limit), '--json', runFields]),
+    (name, limit) => commandJson('gh', runListArgs(name, limit)),
     definedWorkflows,
   )
-  const recent = commandJson('gh', ['run', 'list', '--limit', '20', '--json', runFields])
+  const recent = commandJson('gh', runListArgs(null, 20))
   return {
     workflows: summarizeWorkflowRuns(perWorkflowRows, definedWorkflows),
     recent: recent.slice(0, 10),

scripts/tools/daily-checkin-observability.mjs

@@ -98,6 +98,28 @@ function completedState(runs) {
 const WORKFLOW_HEAD_SAMPLE = 10
 const WORKFLOW_VERDICT_SAMPLE = 100
 
+const workflowRunFields = 'databaseId,workflowName,displayTitle,headSha,status,conclusion,createdAt,updatedAt,url'
+
+/**
+ * The `gh run list` arguments every CI read must use. Scoped to `main` because
+ * test.yml also runs on pull_request: an unscoped list let four PR branch
+ * failures archive a broken main gate on 2026-09-10 while main's own Test run
+ * on the deployed SHA passed. `workflow` is null for the recent feed.
+ */
+export function runListArgs(workflow, limit) {
+  return [
+    'run',
+    'list',
+    ...(workflow ? ['--workflow', workflow] : []),
+    '--branch',
+    'main',
+    '--limit',
+    String(limit),
+    '--json',
+    workflowRunFields,
+  ]
+}
+
 /**
  * Fetch enough runs per workflow that `summarizeWorkflowRuns` can reach the last
  * verdict. `listRuns(name, limit)` returns that workflow's runs, newest first.

test/unit/daily-checkin-observability.test.ts

@@ -9,6 +9,7 @@ import {
   parseWorkflowName,
   readMigrationState,
   refreshProductionRef,
+  runListArgs,
   summarizeWorkflowRuns,
 } from '../../scripts/tools/daily-checkin-observability.mjs'
 
@@ -105,6 +106,17 @@ describe('daily check-in observability', () => {
     )).toContain('filter: {scriptName: "skilld-dev"')
   })
 
+  // test.yml runs on every pull_request, so on 2026-09-10 four PR branch
+  // failures were archived as a broken main gate while main's own Test run on
+  // the deployed SHA passed. Every `gh run list` the collector makes must be
+  // scoped to main, both the per-workflow pages and the recent feed.
+  it('scopes every gh run list to main so a PR failure cannot read as a main failure', () => {
+    expect(runListArgs('Test', 10)).toEqual(expect.arrayContaining(['--workflow', 'Test', '--branch', 'main']))
+    expect(runListArgs('Test', 100)).toEqual(expect.arrayContaining(['--limit', '100']))
+    expect(runListArgs(null, 20)).toEqual(expect.arrayContaining(['--branch', 'main']))
+    expect(runListArgs(null, 20)).not.toContain('--workflow')
+  })
+
   it('surfaces every required workflow and preserves a failure behind an in-progress run', () => {
     expect(summarizeWorkflowRuns([
       run('Deploy to Cloudflare', 'in_progress', '', 4),