test(arch): the stopwatch stays silent, and tabular figures stay in the theme

Two new rules and two extended. The stopwatch may not name a player, a
vibrator, an audio manager — or a wake lock: it is the one timekeeper in the
app that never makes a sound and never holds the CPU awake, and that is now
a build failure rather than a promise in a comment.

`fontFeatureSettings` may appear only under `ui/theme/`, so the figure
settings stay in one place instead of spreading to call sites. The
Android-free list gains the engine; the screen's needle list gains the
service and its notifications.

app/src/test/java/de/jeanlucmakiola/clockula/ArchitectureRulesTest.kt

@@ -136,6 +136,7 @@ class ArchitectureRulesTest {
             path.contains("de/jeanlucmakiola/clockula/domain/alarm/") ||
                 path.endsWith("de/jeanlucmakiola/clockula/alarm/AlarmEngine.kt") ||
                 path.endsWith("de/jeanlucmakiola/clockula/timer/TimerEngine.kt") ||
+                path.endsWith("de/jeanlucmakiola/clockula/stopwatch/StopwatchEngine.kt") ||
                 path.endsWith("de/jeanlucmakiola/clockula/alarm/AlarmResolver.kt") ||
                 path.contains("de/jeanlucmakiola/clockula/system/")
         }
@@ -194,7 +195,15 @@ class ArchitectureRulesTest {
         val ui = kotlinSources
             .filter { it.invariantSeparatorsPath.contains("de/jeanlucmakiola/clockula/ui/") }
 
-        val offenders = ui.usingInCode("TimerScheduler", "TimerService", "TimerRingPolicy", "AlarmManager")
+        val offenders = ui.usingInCode(
+            "TimerScheduler",
+            "TimerService",
+            "TimerRingPolicy",
+            "AlarmManager",
+            // M7 D23: the screen posts no notification and starts no service.
+            "StopwatchService",
+            "StopwatchNotifications",
+        )
 
         assertThat(offenders).isEmpty()
     }
@@ -213,4 +222,42 @@ class ArchitectureRulesTest {
 
         assertThat(offenders).isEmpty()
     }
+
+    /**
+     * M7 D19: the stopwatch is silent. It never opens audio, never vibrates and
+     * never takes a wake lock — which is the one thing a future "make the lap
+     * button click" change would quietly break.
+     */
+    @Test
+    fun `the stopwatch makes no sound`() {
+        val stopwatch = kotlinSources
+            .filter { it.invariantSeparatorsPath.contains("de/jeanlucmakiola/clockula/stopwatch/") }
+
+        val offenders = stopwatch.usingInCode(
+            "MediaPlayer",
+            "RingAudioPlayer",
+            "RingVibrator",
+            "Vibrator",
+            "AudioManager",
+            // D3's "no wake lock, ever" is half of the promise this rule makes,
+            // so the needle list has to name it too.
+            "PowerManager",
+            "WakeLock",
+        )
+
+        assertThat(offenders).isEmpty()
+    }
+
+    /**
+     * M7 D12: tabular figures are configured **once**, in the theme, so no call
+     * site ever re-specifies them and no readout can be left proportional.
+     */
+    @Test
+    fun `tabular figures are configured only in the theme`() {
+        val offenders = kotlinSources.containing("fontFeatureSettings").filterNot {
+            it.contains("de/jeanlucmakiola/clockula/ui/theme/")
+        }
+
+        assertThat(offenders).isEmpty()
+    }
 }