Fix fixture process transitions

tests/quickshell/control-center-services-contract.sh

@@ -45,12 +45,15 @@ trap cleanup EXIT
 
 start_test_shell() {
     stop_test_shell || fail 'pre-existing branch shell did not stop cleanly'
-    qs_for_test --daemonize >"$shell_log" 2>&1
-    for _ in $(seq 1 80); do
-        if qs_for_test ipc show 2>/dev/null | rg '^target home-assistant$' >/dev/null; then
-            return
-        fi
-        sleep 0.1
+    for _attempt in 1 2; do
+        qs_for_test --daemonize >"$shell_log" 2>&1
+        for _ in $(seq 1 80); do
+            if qs_for_test ipc show 2>/dev/null | rg '^target home-assistant$' >/dev/null; then
+                return
+            fi
+            sleep 0.1
+        done
+        stop_test_shell || fail 'failed branch-shell attempt did not stop cleanly'
     done
     sed -n '1,200p' "$shell_log" >&2
     fail 'isolated branch shell did not start'
@@ -185,6 +188,27 @@ wait_for_home_status '
     (.entities[] | select(.id == "light.fixture_hall") | .active == true)
 ' 'nonzero no-output Home action did not fail safely and continue the queue'
 
+qs_for_test ipc call home-assistant fixture process-actions >/dev/null
+qs_for_test ipc call home-assistant brightness light.fixture_living 88 >/dev/null
+jq -e '
+    .busyEntityIds == ["light.fixture_living"] and
+    .pendingBrightness["light.fixture_living"] == 88
+' <<<"$(qs_for_test ipc call home-assistant status)" >/dev/null \
+    || fail 'fixture transition setup did not start an in-flight action'
+qs_for_test ipc call home-assistant fixture process-no-output >/dev/null
+qs_for_test ipc call home-assistant toggle light.fixture_hall >/dev/null
+wait_for_home_status '
+    .phase == "ready" and
+    .busy == false and
+    .busyEntityIds == [] and
+    .pendingBrightness == {} and
+    .entityErrors == {} and
+    (.entities[] |
+        select(.id == "light.fixture_living") |
+        .active == false and .brightnessPct == 36) and
+    (.entities[] | select(.id == "light.fixture_hall") | .active == true)
+' 'switching process fixtures stranded or misattributed the new action'
+
 qs_for_test ipc call home-assistant fixture missing-selected >/dev/null
 jq -e '
     .fixture == true and