ci: reuse the shared build for notification semantics

.github/workflows/ci.yml

@@ -405,6 +405,9 @@ jobs:
       - name: Validate app-host xcodebuild attempt budget
         run: ./tests/test_ci_app_host_xcodebuild_attempts.sh
 
+      - name: Validate notification semantics gates
+        run: python3 tests/test_ci_notification_semantics.py
+
       - name: Validate app-host test failure classification
         run: python3 tests/test_ci_app_host_test_output.py
 
@@ -1191,7 +1194,6 @@ jobs:
             -xctestrun "$CMUX_APP_HOST_XCTESTRUN" \
             -destination "platform=macOS" \
             CMUX_SKIP_ZIG_BUILD=1 \
-            -only-testing:cmuxTests/AgentNotificationRegressionTests \
             -only-testing:cmuxTests/DockNotificationAttentionTests \
             -only-testing:cmuxTests/ClaudeHookLifecycleCleanupTests \
             -only-testing:cmuxTests/ClaudeHookLiveDeliveryTargetTests \
@@ -1846,6 +1848,35 @@ jobs:
         with:
           bun-version: "1.3.6"
 
+      - name: Run agent notification semantics
+        if: ${{ matrix.shard == fromJSON(env.CMUX_APP_HOST_FOCUSED_REGRESSION_SHARD) }}
+        run: |
+          set -euo pipefail
+          # Reuse compile admission's product instead of rebuilding the app in
+          # agent-notification-tests.yml. Keep each suite in a fresh host and
+          # require positive execution, outside the tolerant broad batches.
+          command -v node
+          bun_path="$(command -v bun)"
+          bun_install="$(dirname "$(dirname "$bun_path")")"
+          for suite in \
+            AgentNotificationRegressionTests \
+            AgentJournalLifecycleCenterTests \
+            FeedWaiterRegistryTests \
+            ClaudeBackgroundWorkNotifyTests \
+            OpenCodeHookRegressionTests
+          do
+            test_log="$RUNNER_TEMP/cmux-notification-${suite}.txt"
+            scripts/ci/run-in-console-session.sh \
+              env "TEST_RUNNER_PATH=$PATH" "TEST_RUNNER_BUN_INSTALL=$bun_install" \
+              scripts/ci/run-app-host-xcodebuild.sh \
+              -xctestrun "$CMUX_APP_HOST_XCTESTRUN" \
+              -destination "platform=macOS" \
+              CMUX_SKIP_ZIG_BUILD=1 \
+              -only-testing:"cmuxTests/$suite" \
+              test-without-building 2>&1 | tee "$test_log"
+            scripts/ci/require_selected_test_execution.sh "$test_log" "cmuxTests/$suite"
+          done
+
       - name: Install pinned nushell (shell-integration tests)
         if: ${{ matrix.shard == fromJSON(env.CMUX_APP_HOST_FOCUSED_REGRESSION_SHARD) }}
         run: |
@@ -2357,6 +2388,14 @@ jobs:
               exit 1
             fi
             echo "::group::swift test $pkgdir"
+            swift_test_args=(--package-path "$pkgdir")
+            # Preserve the notification workflow's warning gate without a
+            # second package build or changing the existing startup retry.
+            case "$pkg" in
+              CMUXAgentLaunch|CmuxAgentJournal)
+                swift_test_args+=(-Xswiftc -warnings-as-errors)
+                ;;
+            esac
             case "$pkg" in
             # CmuxFoundation has several process-tree suites whose child
             # fixtures share global process resources; run each suite in its
@@ -2366,7 +2405,7 @@ jobs:
               ;;
             CmuxTerminal|CmuxTerminalCore)
               test_status=0
-              output="$(swift test --package-path "$pkgdir" 2>&1)" || test_status=$?
+              output="$(swift test "${swift_test_args[@]}" 2>&1)" || test_status=$?
               printf '%s\n' "$output"
               if [ "$test_status" -ne 0 ]; then
                 if printf '%s\n' "$output" | grep -Eq 'Test run with [0-9]+ tests( in [0-9]+ suites)? passed' \
@@ -2385,15 +2424,15 @@ jobs:
               # test failure: retry exactly once, and only when no test
               # output was emitted.
               test_status=0
-              output="$(swift test --package-path "$pkgdir" 2>&1)" || test_status=$?
+              output="$(swift test "${swift_test_args[@]}" 2>&1)" || test_status=$?
               printf '%s\n' "$output"
               if [ "$test_status" -ne 0 ] \
                 && printf '%s\n' "$output" | grep -Fq 'Build complete!' \
                 && printf '%s\n' "$output" | grep -Eq 'Exited with unexpected signal code [56]([^0-9]|$)' \
                 && ! printf '%s\n' "$output" | grep -Eq '^(Test Suite|Test Case|◇ |↳ |✔ |✘ )'; then
                 echo "Test runner crashed at startup (runner flake); retrying $pkg once."
                 test_status=0
-                output="$(swift test --package-path "$pkgdir" 2>&1)" || test_status=$?
+                output="$(swift test "${swift_test_args[@]}" 2>&1)" || test_status=$?
                 printf '%s\n' "$output"
               fi
               if [ "$test_status" -ne 0 ]; then

scripts/ci/cmux_unit_test_shard.py

@@ -35,6 +35,11 @@
 DEFAULT_TIMINGS_PATH = Path(__file__).resolve().parent / "cmux-unit-test-timings.json"
 FALLBACK_TEST_MS = 200
 FOCUSED_GATE_SELECTORS = {
+    "cmuxTests/AgentNotificationRegressionTests",
+    "cmuxTests/AgentJournalLifecycleCenterTests",
+    "cmuxTests/FeedWaiterRegistryTests",
+    "cmuxTests/ClaudeBackgroundWorkNotifyTests",
+    "cmuxTests/OpenCodeHookRegressionTests",
     "cmuxTests/AgentRestoreLiveOwnerAdmissionTests",
     "cmuxTests/BrowserSystemProxyMirrorTests",
     "cmuxTests/CLISSHSessionAttachAnchorTests",

scripts/ci/run-app-host-xcodebuild.sh

@@ -57,6 +57,15 @@ fi
 if [ -n "${GITHUB_ACTIONS:-}" ]; then
   app_host_test_runner_environment+=("TEST_RUNNER_GITHUB_ACTIONS=$GITHUB_ACTIONS")
 fi
+# Focused app-host suites invoke Node/Bun-backed helpers from the test process.
+# Xcode does not inherit these driver variables, so carry them through the
+# TEST_RUNNER_ channel when the caller supplied them.
+if [ -n "${TEST_RUNNER_PATH:-}" ]; then
+  app_host_test_runner_environment+=("TEST_RUNNER_PATH=$TEST_RUNNER_PATH")
+fi
+if [ -n "${TEST_RUNNER_BUN_INSTALL:-}" ]; then
+  app_host_test_runner_environment+=("TEST_RUNNER_BUN_INSTALL=$TEST_RUNNER_BUN_INSTALL")
+fi
 app_host_home=""
 app_host_key=""
 app_host_receipt_dir=""

tests/test_ci_app_host_xcodebuild_retry.sh

@@ -28,6 +28,10 @@ if [ "${CMUX_MOCK_XCODEBUILD_PROCESS:-0}" = "1" ]; then
     "${TEST_RUNNER_CMUX_APP_HOST_KEY:-<unset>}" \
     "${TEST_RUNNER_CMUX_APP_HOST_RECEIPT_DIR:-<unset>}" \
     >> "$CMUX_CAPTURE_TEST_RUNNER_HOME_ENV"
+  if [ -n "${CMUX_CAPTURE_TEST_RUNNER_TOOL_ENV:-}" ]; then
+    printf '%s|%s\n' "${TEST_RUNNER_PATH-<unset>}" "${TEST_RUNNER_BUN_INSTALL-<unset>}" \
+      >> "$CMUX_CAPTURE_TEST_RUNNER_TOOL_ENV"
+  fi
   config_home="${TEST_RUNNER_HOME:-${HOME:-/tmp}}"
   config_category=default
   config_message="reading configuration file"
@@ -250,12 +254,15 @@ CMUX_CAPTURE_XCODEBUILD_ARGS="$TMP_DIR/xcodebuild-args.log" \
 CMUX_CAPTURE_TEST_RUNNER_ENV="$TMP_DIR/test-runner-env.log" \
 CMUX_CAPTURE_XCODEBUILD_PARENT_ENV="$TMP_DIR/xcodebuild-parent-env.log" \
 CMUX_CAPTURE_TEST_RUNNER_HOME_ENV="$TMP_DIR/test-runner-home-env.log" \
+CMUX_CAPTURE_TEST_RUNNER_TOOL_ENV="$TMP_DIR/test-runner-tool-env.log" \
 CMUX_MOCK_XCODEBUILD_PROCESS=1 \
 CMUX_APP_HOST_XCODEBUILD_ATTEMPTS=2 \
 CMUX_XCODEBUILD_NONINTERACTIVE_IDLE_TIMEOUT_SECONDS=0.1 \
 CMUX_CI_APP_HOST_ISOLATION_REQUIRED=1 \
 CMUX_APP_HOST_HOME="$APP_HOST_HOME" \
 CMUX_APP_HOST_XDG_CONFIG_HOME="$APP_HOST_XDG_CONFIG_HOME" \
+TEST_RUNNER_PATH="/ci/node/bin:/usr/bin" \
+TEST_RUNNER_BUN_INSTALL="/ci/bun" \
 CFFIXED_USER_HOME="$XCODE_PARENT_FIXED_HOME" \
 XDG_CONFIG_HOME="$XCODE_PARENT_XDG_CONFIG_HOME" \
   bash "$ROOT_DIR/scripts/ci/run-app-host-xcodebuild.sh" test >"$TMP_DIR/output.log" 2>&1
@@ -289,6 +296,12 @@ if [ "$runner_marker_count" -eq 0 ] || [ "$runner_marker_count" -ne "$invocation
   exit 1
 fi
 
+if [ "$(grep -Fxc '/ci/node/bin:/usr/bin|/ci/bun' "$TMP_DIR/test-runner-tool-env.log" || true)" -ne "$invocation_count" ]; then
+  cat "$TMP_DIR/test-runner-tool-env.log"
+  echo "FAIL: focused test-runner tool paths must reach every app-host launch"
+  exit 1
+fi
+
 isolated_parent_count="$(awk -F '|' -v isolated="$APP_HOST_HOME" '
   $1 == isolated { count += 1 }
   END { print count + 0 }