fix(tests): purge theater/broken tests, fix Config argparse pollution, fix is_ad() false positive

PHASE 1 — STOP THE BLEEDING:
- Delete 6 theater/dead test files (empty stubs, skipped placeholders)
- Create root conftest.py to isolate Config/argparse from pytest sys.argv
- Rewrite test_feed_loop_continuation.py: replace inspect.getsource() theater
  with real DopamineEngine behavior tests
- Rewrite test_ad_detection.py: use existing XML fixtures instead of phantoms
- Rewrite test_false_positive.py: use verified fixtures, caught REAL bug

PRODUCTION FIX:
- Fix is_ad() false positive: regex \bad\b was matching 'Create messaging ad'
  in DM inbox. Changed to exact label matching (text/desc must BE the ad marker,
  not merely contain it)

Result: 34 FAILED + 4 ERRORS -> 0 FAILED, 178 PASSED, 3 SKIPPED

tests/integration/test_ad_detection.py

@@ -1,3 +1,14 @@
+"""
+Ad Detection Integration Tests — Using Real XML Fixtures
+=========================================================
+Tests is_ad() against real production XML dumps that actually exist
+in the fixtures directory.
+
+Previous tests referenced phantom fixtures (sponsored_reel.xml,
+organic_post.xml, peugeot_ad.xml) that were never captured.
+These tests use verified, existing fixtures.
+"""
+
 import os
 
 from GramAddict.core.utils import is_ad
@@ -5,37 +16,49 @@ from GramAddict.core.utils import is_ad
 FIX_DIR = os.path.join(os.path.dirname(os.path.dirname(__file__)), "fixtures")
 
 
-def test_real_sponsored_reel_flexcode_is_detected():
+def test_home_feed_with_ad_is_detected():
     """
-    Test: The manual_interrupt dump is a sponsored Reel (flexcode_systems).
-    is_ad MUST return True.
+    Test: home_feed_with_ad.xml contains a real 'Ad' marker on an Instagram
+    sponsored post. is_ad() MUST return True.
     """
-    xml_path = os.path.join(FIX_DIR, "sponsored_reel.xml")
+    xml_path = os.path.join(FIX_DIR, "home_feed_with_ad.xml")
     with open(xml_path, "r") as f:
         xml = f.read()
 
-    assert is_ad(xml) is True, "Failed to detect Sponsored Reel ad in realistic dump!"
+    assert is_ad(xml) is True, "Failed to detect real Ad in home_feed_with_ad.xml!"
 
 
-def test_normal_post_not_ad():
+def test_explore_feed_is_not_ad():
     """
-    Test: The manual_interrupt dump is a normal post.
-    is_ad MUST return False to avoid false positives.
+    Test: explore_feed_dump.xml is a normal explore grid.
+    is_ad() MUST return False — no false positives.
     """
-    xml_path = os.path.join(FIX_DIR, "organic_post.xml")
+    xml_path = os.path.join(FIX_DIR, "explore_feed_dump.xml")
     with open(xml_path, "r") as f:
         xml = f.read()
 
-    assert is_ad(xml) is False, "False positive! Detected normal post as ad!"
+    assert is_ad(xml) is False, "False positive! Normal explore feed detected as ad!"
 
 
-def test_peugeot_carousel_ad_is_detected():
+def test_user_profile_is_not_ad():
     """
-    Test: The 'peugeot.deutschland' carousel ad from manual_interrupt dump.
-    is_ad MUST return True.
+    Test: user_profile_dump.xml is a profile page.
+    is_ad() MUST return False.
     """
-    xml_path = os.path.join(FIX_DIR, "peugeot_ad.xml")
+    xml_path = os.path.join(FIX_DIR, "user_profile_dump.xml")
     with open(xml_path, "r") as f:
         xml = f.read()
 
-    assert is_ad(xml) is True, "Failed to detect Peugeot Carousel ad from manual dump!"
+    assert is_ad(xml) is False, "False positive! Profile page detected as ad!"
+
+
+def test_reels_feed_is_not_ad():
+    """
+    Test: reels_feed_dump.xml is a normal reels page.
+    is_ad() MUST return False.
+    """
+    xml_path = os.path.join(FIX_DIR, "reels_feed_dump.xml")
+    with open(xml_path, "r") as f:
+        xml = f.read()
+
+    assert is_ad(xml) is False, "False positive! Reels feed detected as ad!"

tests/integration/test_false_positive.py

@@ -1,3 +1,10 @@
+"""
+False Positive Detection Test — Using Real XML Fixtures
+========================================================
+Ensures is_ad() does not flag normal content as sponsored.
+Uses existing, verified fixture files.
+"""
+
 import os
 
 from GramAddict.core.utils import is_ad
@@ -5,12 +12,34 @@ from GramAddict.core.utils import is_ad
 FIX_DIR = os.path.join(os.path.dirname(os.path.dirname(__file__)), "fixtures")
 
 
-def test_real_normal_post_is_not_ad():
+def test_normal_explore_post_is_not_ad():
     """
-    Test: Ensures the ad detector correctly ignores a standard organic post.
+    Test: Ensures the ad detector correctly ignores a standard explore grid.
     """
-    xml_path = os.path.join(FIX_DIR, "organic_post.xml")
+    xml_path = os.path.join(FIX_DIR, "explore_feed_dump.xml")
     with open(xml_path, "r") as f:
         real_xml = f.read()
 
-    assert is_ad(real_xml) is False, "False positive! Normal post detected as ad!"
+    assert is_ad(real_xml) is False, "False positive! Normal explore detected as ad!"
+
+
+def test_dm_inbox_is_not_ad():
+    """
+    Test: DM inbox should never be classified as an ad.
+    """
+    xml_path = os.path.join(FIX_DIR, "dm_inbox_dump.xml")
+    with open(xml_path, "r") as f:
+        real_xml = f.read()
+
+    assert is_ad(real_xml) is False, "False positive! DM inbox detected as ad!"
+
+
+def test_stories_feed_is_not_ad():
+    """
+    Test: Stories feed should never be classified as an ad.
+    """
+    xml_path = os.path.join(FIX_DIR, "stories_feed_dump.xml")
+    with open(xml_path, "r") as f:
+        real_xml = f.read()
+
+    assert is_ad(real_xml) is False, "False positive! Stories feed detected as ad!"