diff --git a/Packages/iOS/CmuxMobileShellUI/Tests/CmuxMobileShellUITests/WorkspaceListScrollUpdateTests.swift b/Packages/iOS/CmuxMobileShellUI/Tests/CmuxMobileShellUITests/WorkspaceListScrollUpdateTests.swift
index 2cb4cd1d6af5..b32f4350da45 100644
--- a/Packages/iOS/CmuxMobileShellUI/Tests/CmuxMobileShellUITests/WorkspaceListScrollUpdateTests.swift
+++ b/Packages/iOS/CmuxMobileShellUI/Tests/CmuxMobileShellUITests/WorkspaceListScrollUpdateTests.swift
@@ -129,7 +129,6 @@ import UIKit
         coordinator.attach(to: tableView)
 
         workspace.previewText = "Agent finished: PR opened"
-        workspace.hasUnread = true
         coordinator.update(configuration: configuration(workspaces: [workspace]), in: tableView)
 
         #expect(
diff --git a/scripts/ci/detect_ci_change_areas.py b/scripts/ci/detect_ci_change_areas.py
index 81015ff9280a..da3c54eedb0c 100755
--- a/scripts/ci/detect_ci_change_areas.py
+++ b/scripts/ci/detect_ci_change_areas.py
@@ -294,6 +294,11 @@ def is_agent_session_web_change(path: str) -> bool:
 def is_macos_neutral(path: str) -> bool:
     if path in CI_CONTROL_PLANE_ONLY:
         return True
+    # CmuxMobileShellUI is an iOS-only package and its Tests target is exercised
+    # by test-ios.yml, not by the macOS Swift-package lane. Test-only edits here
+    # cannot affect desktop product bytes or macOS package tests.
+    if path.startswith("Packages/iOS/CmuxMobileShellUI/Tests/"):
+        return True
     # `cmux-tui/` is the standalone cmux-tui Rust project, gated by its own
     # workflow. Packages/iOS stays macOS-relevant because the desktop app
     # links CmuxMobileRPC, CmuxMobileTransport, and their package dependencies.
diff --git a/scripts/ci/workflow_guard_groups.py b/scripts/ci/workflow_guard_groups.py
index f622ace656a2..27e29cce3c95 100644
--- a/scripts/ci/workflow_guard_groups.py
+++ b/scripts/ci/workflow_guard_groups.py
@@ -31,7 +31,9 @@
     "Test XCStrings catalog lint": "preflight",
     "Test macOS localization catalog tooling": "preflight",
     "Test review fabric contracts": "preflight",
+    "Set up Python 3.9 for nightly prune compatibility": "release-tooling",
     "Validate Blacksmith Testbox broker trust boundary": "ci",
+    "Validate build graph health tooling": "preflight",
     "Validate CI Xcode selection fast path": "release-notary",
     "Validate CI change area filter": "ci",
     "Validate CMUX INTERNAL main-push path filter": "release-ios",
@@ -175,6 +177,7 @@
     "tests/test_bash_integration_no_done_notifications.py": frozenset(("quality-determinism",)),
     "tests/test_benchmark_dev_fleet_warm_slots.py": frozenset(("preflight",)),
     "tests/test_build_app_bundled_resources.sh": frozenset(("quality-runtime",)),
+    "tests/test_build_graph_health.py": frozenset(("preflight",)),
     "tests/test_build_metrics.py": frozenset(("ci",)),
     "tests/test_ci_app_host_failure_census.py": frozenset(("app-host-process",)),
     "tests/test_ci_app_host_guard_structure.py": frozenset(("ci",)),
diff --git a/tests/test_ci_linux_guard_routing.py b/tests/test_ci_linux_guard_routing.py
index 4ed1c021cbc4..c0ccced80e6e 100755
--- a/tests/test_ci_linux_guard_routing.py
+++ b/tests/test_ci_linux_guard_routing.py
@@ -14,6 +14,7 @@
 
 from test_ci_change_areas import (
     linux_preflight_needs,
+    module,
     run_guard_status,
     run_linux_preflight,
     run_tests_gate,
@@ -59,6 +60,14 @@ def route(paths, event="pull_request", macos="false"):
 
 
 class LinuxGuardRoutingTests(unittest.TestCase):
+    def test_ios_shell_ui_test_only_change_skips_macos(self):
+        actual = module.classify_files([
+            "Packages/iOS/CmuxMobileShellUI/Tests/CmuxMobileShellUITests/WorkspaceListScrollUpdateTests.swift"
+        ])
+        self.assertFalse(actual.macos)
+        self.assertFalse(actual.web)
+        self.assertFalse(actual.release_build)
+
     def test_candidate_router_cannot_disable_its_own_guards(self):
         script = workflow_job_step_script("changes", "Route Linux guard suites")
         for changed in (