test(RED): expose story view detection gap — ScreenIdentity returns UNKNOWN

Bug evidence from run 2026-04-27_23-46-57:
- Bot started on a story (reel_viewer_media_layout, 'Like Story')
- ScreenIdentity classified it as UNKNOWN
- GOAP chose 'scroll down' 4 times (stories don't scroll)
- Bot was trapped in infinite scroll loop

Captured real XML fixture: story_view_full.xml
1 test FAILS (screen_identity → UNKNOWN instead of STORY_VIEW)

tests/e2e/test_engine_perception.py

@@ -293,3 +293,73 @@ class TestSAERealFixturePerception:
 @pytest.mark.skip(reason="Lying mock tests removed: Using StatefulMockDevice with string transitions is theater.")
 def test_perception_mock_theater_purged():
     pass
+
+
+# ─────────────────────────────────────────────────────
+# STORY VIEW DETECTION TESTS (Phase 4)
+# Exposes critical gap: Story screens were classified as UNKNOWN,
+# causing GOAP to scroll blindly instead of pressing back.
+# ─────────────────────────────────────────────────────
+
+
+class TestStoryViewDetection:
+    """Story views MUST be structurally detected — no LLM fallback needed.
+
+    Bug evidence from run 2026-04-27_23-46-57:
+    - Bot started on a Story screen (reel_viewer_media_layout, Like Story button)
+    - ScreenIdentity returned UNKNOWN
+    - GOAP chose 'scroll down' 4 times instead of 'press back'
+    - Bot was trapped in an infinite scroll loop on a story
+    """
+
+    def test_screen_identity_classifies_story_as_story_view(self):
+        """ScreenIdentity must detect reel_viewer_* markers as STORY_VIEW."""
+        from GramAddict.core.perception.screen_identity import ScreenIdentity, ScreenType
+
+        si = ScreenIdentity(bot_username="marisaundmarc")
+        xml = _load_fixture("story_view_full.xml")
+        result = si.identify(xml)
+
+        assert result["screen_type"] == ScreenType.STORY_VIEW, (
+            f"Story view misclassified as {result['screen_type']}! "
+            f"Expected STORY_VIEW but ScreenIdentity returned {result['screen_type'].name}."
+        )
+
+    def test_sae_perceive_story_as_normal(self):
+        """SAE must classify Story views as NORMAL (it's Instagram, not an obstacle).
+
+        The bot's reaction to a Story should be: press back → navigate away.
+        But first, SAE must NOT flag it as an obstacle.
+        """
+        device = make_mock_device()
+        sae = SituationalAwarenessEngine(device)
+        xml = _load_fixture("story_view_full.xml")
+        result = sae.perceive(xml)
+        assert result == SituationType.NORMAL, f"Story view misclassified as {result}"
+
+    def test_story_view_available_actions_include_press_back(self):
+        """On a story, 'press back' must be in available actions and 'scroll down' should NOT
+        be a meaningful action (stories don't scroll, they swipe)."""
+        from GramAddict.core.perception.screen_identity import ScreenIdentity, ScreenType
+
+        si = ScreenIdentity(bot_username="marisaundmarc")
+        xml = _load_fixture("story_view_full.xml")
+        result = si.identify(xml)
+
+        assert "press back" in result["available_actions"], (
+            "'press back' must be available on Story views!"
+        )
+
+    def test_story_view_has_no_navigation_tabs(self):
+        """Stories hide the navigation bar. The available actions must NOT
+        include tab navigation (tap home tab, tap explore tab, etc.)."""
+        from GramAddict.core.perception.screen_identity import ScreenIdentity
+
+        si = ScreenIdentity(bot_username="marisaundmarc")
+        xml = _load_fixture("story_view_full.xml")
+        result = si.identify(xml)
+
+        tab_actions = [a for a in result["available_actions"] if "tap" in a and "tab" in a]
+        assert len(tab_actions) == 0, (
+            f"Story view should have NO tab navigation, but found: {tab_actions}"
+        )