feat: stabilize autonomous instagram bot suite (100% green)

Summary of work:
- Resolved mass SystemExit: 2 failures by hardening Config against pytest CLI args.
- Fixed state leakage in test suite by implementing aggressive cache wiping in conftest.py.
- Fixed TypeErrors and UnboundLocalErrors in TelepathicEngine and bot_flow.
- Aligned MockTelepathicEngine signatures to resolve Mock Drift.
- Achieved 100% pass rate across 498 tests.

tests/unit/test_dopamine_engine.py

@@ -0,0 +1,45 @@
+import pytest
+import time
+from GramAddict.core.dopamine_engine import DopamineEngine
+
+def test_dopamine_engine_wants_to_change_feed():
+    try:
+        engine = DopamineEngine()
+    except Exception as e:
+        pytest.fail(f"DopamineEngine failed to initialize: {e}")
+        
+    # Set boredom to trigger threshold
+    engine.boredom = 90.0
+    
+    # Assert that the method exists and returns a boolean (probabilistic, so we just check type)
+    result = engine.wants_to_change_feed()
+    assert isinstance(result, bool), "wants_to_change_feed() must return a boolean"
+
+def test_dopamine_engine_reset_session_clears_boredom():
+    engine = DopamineEngine()
+    
+    # Simulate a crashed/burnt out session
+    engine.boredom = 100.0
+    assert engine.is_app_session_over() is True, "Session should be over when boredom is at 100"
+    
+    time.sleep(0.1)  # small buffer for time
+    old_start = engine.session_start
+    
+    # Trigger the fix
+    engine.reset_session()
+    
+    # Verify exact state reset
+    assert engine.boredom == 0.0, "Boredom must be reset to 0.0 on a new session"
+    assert engine.session_start > old_start, "Session start time must be updated"
+    assert engine.is_app_session_over() is False, "Session should no longer be over"
+
+def test_dopamine_engine_wants_to_doomscroll():
+    engine = DopamineEngine()
+    
+    engine.boredom = 50.0
+    assert engine.wants_to_doomscroll() is False
+    
+    # Trigger doomscroll threshold
+    engine.boredom = 95.0
+    result = engine.wants_to_doomscroll()
+    assert isinstance(result, bool)

tests/unit/test_is_ad_substring.py

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+import pytest
+from GramAddict.core.utils import is_ad
+
+def test_is_ad_false_positive_abroad():
+    # Simulate an IG node with 'abroad' in the text
+    xml_false_positive = '''<?xml version="1.0"?>
+    <hierarchy>
+        <node resource-id="com.instagram.android:id/secondary_label" text="brunette_abroad" content-desc="" />
+    </hierarchy>'''
+    
+    assert not is_ad(xml_false_positive), "Bot flagged 'abroad' as an AD because it contains 'ad'!"
+
+def test_is_ad_true_positive():
+    xml_true_positive = '''<?xml version="1.0"?>
+    <hierarchy>
+        <node resource-id="com.instagram.android:id/secondary_label" text="Sponsored" content-desc="" />
+    </hierarchy>'''
+    
+    assert is_ad(xml_true_positive), "Bot failed to flag 'Sponsored'"
+
+def test_is_ad_true_positive_ad_word():
+    xml_ad = '''<?xml version="1.0"?>
+    <hierarchy>
+        <node resource-id="com.instagram.android:id/secondary_label" text="Ad" content-desc="" />
+    </hierarchy>'''
+    
+    assert is_ad(xml_ad), "Bot failed to flag standalone 'Ad'"