feat: confirm playback from the media session, and stop demoting the top row

Phase 3 DoD reached end to end: `artemis run spotify_play query="Rolling
Stones Honky Tonk"` played the right song in 13 steps / 35.3s, with playback
paused first so the pass proves the row tap started it.

Two things stopped it before that, both found on the real phone:

- The playback check asserted on an on-screen "Pause" label that Spotify
  never shows: its transport button keeps the label "Play" while music is
  playing. The recipe now ends with a `playing` step that reads the app's
  media session (state PLAYING) and confirms the track title contains the
  query words. A failure reports the state and the track it found.
- tap_row pressed the wrong row. Once a track is loaded its row carries a
  `Paused` state indicator, and counting that content description as row text
  dropped the top hit below an identical duplicate further down, so the tap
  went to y=1443 instead of y=878. Rows are now scored on their title and
  subtitle only (state lives in content descriptions), and scores within
  rowScoreTolerance are treated as equal so the higher row wins, because
  Spotify already ranks by relevance.

internal/ui/rows_test.go reproduces that results screen, including the state
indicator and the duplicate row.

docs/phase-3-spotify-recipe.md records the successful run, the independent
media-session and audio-output reads, and the failure that preceded it.

internal/ui/rows_test.go

@@ -18,9 +18,12 @@ const spotifyRowDump = `<?xml version='1.0' encoding='UTF-8' standalone='yes' ?>
     </node>
     <node index="1" class="android.view.ViewGroup" resource-id="com.spotify.music:id/row_root" clickable="true" enabled="true" bounds="[0,794][1080,962]">
       <node index="0" class="android.widget.ImageView" resource-id="com.spotify.music:id/artwork" clickable="false" enabled="true" bounds="[42,815][168,941]"/>
-      <node index="1" class="android.widget.TextView" resource-id="com.spotify.music:id/title" text="Honky Tonk Women" clickable="false" enabled="true" bounds="[200,815][828,881]"/>
-      <node index="2" class="android.widget.TextView" resource-id="com.spotify.music:id/subtitle" text="Song • The Rolling Stones" clickable="false" enabled="true" bounds="[200,886][828,941]"/>
-      <node index="3" class="android.view.ViewGroup" resource-id="com.spotify.music:id/action_bar" clickable="false" enabled="true" bounds="[828,815][1080,941]">
+      <node index="1" class="android.view.ViewGroup" resource-id="com.spotify.music:id/play_indicator" clickable="false" enabled="true" bounds="[200,832][232,864]">
+        <node index="0" class="android.view.View" content-desc="Paused" clickable="false" enabled="true" bounds="[200,832][232,864]"/>
+      </node>
+      <node index="2" class="android.widget.TextView" resource-id="com.spotify.music:id/title" text="Honky Tonk Women" clickable="false" enabled="true" bounds="[243,815][828,881]"/>
+      <node index="3" class="android.widget.TextView" resource-id="com.spotify.music:id/subtitle" text="Song • The Rolling Stones" clickable="false" enabled="true" bounds="[200,886][828,941]"/>
+      <node index="4" class="android.view.ViewGroup" resource-id="com.spotify.music:id/action_bar" clickable="false" enabled="true" bounds="[828,815][1080,941]">
         <node index="0" class="android.widget.ImageButton" resource-id="com.spotify.music:id/context_menu_button" content-desc="More options for song Honky Tonk Women" clickable="true" enabled="true" bounds="[828,815][954,941]"/>
         <node index="1" class="android.widget.Button" resource-id="com.spotify.music:id/add_button" content-desc="Add Honky Tonk Women to My Library" clickable="true" enabled="true" bounds="[954,815][1080,941]"/>
       </node>
@@ -124,6 +127,46 @@ func TestRowScorePrefersPrecision(t *testing.T) {
 	}
 }
 
+// TestBestRowPrefersTheTopHitWhenItsRowCarriesStateText is the regression that
+// cost the most: the top hit's row carries a "Paused" state indicator once it is
+// the loaded track, and counting that description as row text pushed the score
+// below an identical duplicate further down the list. tap_row then pressed the
+// duplicate at y=1443 and playback never started.
+func TestBestRowPrefersTheTopHitWhenItsRowCarriesStateText(t *testing.T) {
+	h := spotifyRows(t)
+	row, err := h.BestRow("Rolling Stones Honky Tonk", spotifyRowID, 1080, 2400)
+	if err != nil {
+		t.Fatalf("BestRow: %v", err)
+	}
+	if row.Title != "Honky Tonk Women" {
+		t.Fatalf("chose %q", row.Title)
+	}
+	if row.Top != 794 {
+		t.Fatalf("chose the row at y=%d, want the top hit at y=794", row.Top)
+	}
+	if row.Centre.Y != (794+962)/2 {
+		t.Fatalf("tap point y=%d is not the top row's centre", row.Centre.Y)
+	}
+}
+
+func TestRowTextsIgnoreStateDescriptions(t *testing.T) {
+	h := spotifyRows(t)
+	var top *Node
+	h.Walk(func(n *Node) {
+		if n.ResourceID == spotifyRowID && n.Bounds == "[0,794][1080,962]" {
+			top = n
+		}
+	})
+	if top == nil {
+		t.Fatal("top row not found in the sample dump")
+	}
+	for _, line := range rowTexts(top) {
+		if line == "Paused" {
+			t.Fatal("the row's state description must not count as row text")
+		}
+	}
+}
+
 func TestRowTextsSkipActionButtons(t *testing.T) {
 	h := spotifyRows(t)