diff --git a/.github/workflows/macos-latest.yml b/.github/workflows/macos-latest.yml
index 38937d293..a9698fa3a 100644
--- a/.github/workflows/macos-latest.yml
+++ b/.github/workflows/macos-latest.yml
@@ -18,15 +18,8 @@ name: macos-latest
 
 on:
   push:
-    branches-ignore:
-      - main
-  pull_request:
     branches:
       - main
-    paths-ignore:
-      - 'docs/**'
-      - 'images/**'
-      - '**/*.md'
 
 jobs:
   macos-latest:
diff --git a/.github/workflows/windows-latest.yml b/.github/workflows/windows-latest.yml
index 6ef2e14dc..c225d4f77 100644
--- a/.github/workflows/windows-latest.yml
+++ b/.github/workflows/windows-latest.yml
@@ -18,15 +18,8 @@ name: windows-latest
 
 on:
   push:
-    branches-ignore:
-      - main
-  pull_request:
     branches:
       - main
-    paths-ignore:
-      - 'docs/**'
-      - 'images/**'
-      - '**/*.md'
 
 jobs:
   windows-latest:
diff --git a/build/Build.CI.GitHubActions.cs b/build/Build.CI.GitHubActions.cs
index ed3661db3..d719f3234 100644
--- a/build/Build.CI.GitHubActions.cs
+++ b/build/Build.CI.GitHubActions.cs
@@ -9,18 +9,17 @@
     "windows-latest",
     GitHubActionsImage.WindowsLatest,
     FetchDepth = 0,
-    OnPushBranchesIgnore = new[] { MainBranch },
-    OnPullRequestBranches = new[] { MainBranch },
-    OnPullRequestExcludePaths = new[] { "docs/**", "images/**", "**/*.md" },
+    OnPushBranches = new[] { MainBranch },
     InvokedTargets = new[] { nameof(ITest.Test), nameof(IPack.Pack) },
     PublishArtifacts = false)]
+// macOS and Windows runs are reserved for main-branch validation (post-merge
+// and release pipelines). PRs and feature-branch pushes get Linux-only for
+// fast, cheap feedback.
 [GitHubActions(
     "macos-latest",
     GitHubActionsImage.MacOsLatest,
     FetchDepth = 0,
-    OnPushBranchesIgnore = new[] { MainBranch },
-    OnPullRequestBranches = new[] { MainBranch },
-    OnPullRequestExcludePaths = new[] { "docs/**", "images/**", "**/*.md" },
+    OnPushBranches = new[] { MainBranch },
     InvokedTargets = new[] { nameof(ITest.Test), nameof(IPack.Pack) },
     PublishArtifacts = false)]
 [GitHubActions(