fix(perception): 3 production bug regressions from 2026-05-01 run

Bug 1 — VLM Profile Tab Hallucination:
  - VLM confused 'Profile' nav tab with post author username
  - Added Author Tab Guard to filter_navigation_conflicts()
  - Fixed mock LLM to use structural row_feed_photo_profile matching
    instead of hardcoded username (was the test lie)

Bug 2 — Like Button 1-Byte Delta Kill:
  - Toggle actions (like/save) produce 1-byte XML deltas
  - GOAP's MIN_UI_CHANGE_BYTES=50 threshold killed them as 'no change'
  - Split interaction gate: interactions use ANY xml diff, navigations
    keep the 50-byte threshold

Bug 3 — Empty Username Silently Accepted:
  - PostDataExtraction returned 'Post by @' with no warning
  - Added 'username_missing' reliability flag to result dict
  - Downstream consumers can now detect degraded data quality

Cleanup:
  - Removed all debug print() statements from production code
  - Replaced with structured logger.debug() calls

GramAddict/core/goap.py

@@ -427,7 +427,11 @@ class GoalExecutor:
                     action_success = False
         else:
             # For interactions (like, follow) or unknown goals, use XML delta + semantic verify
-            if ui_changed:
+            # REGRESSION FIX 2026-05-01: Toggle actions (like/save) produce tiny XML deltas
+            # (e.g. checked="false" → "true" = 1 byte). We must NOT gate interactions on
+            # MIN_UI_CHANGE_BYTES. ANY change at all warrants semantic verification.
+            interaction_xml_changed = post_xml != xml_dump
+            if interaction_xml_changed:
                 score = best_node.get("score", 0.0) if best_node else 0.0
                 verification = engine.verify_success(action, post_xml, device=self.device, confidence=score)
                 if verification is True:

GramAddict/core/perception/feed_analysis.py

@@ -52,9 +52,9 @@ def extract_post_content(context_xml: str, device=None) -> dict:
     This is the BOT'S EYES — what it actually "sees" about each post.
 
     Returns:
-        {'username': str, 'description': str, 'caption': str}
+        {'username': str, 'description': str, 'caption': str, 'username_missing': bool}
     """
-    result = {"username": "", "description": "", "caption": ""}
+    result = {"username": "", "description": "", "caption": "", "username_missing": False}
 
     try:
         from GramAddict.core.telepathic_engine import TelepathicEngine
@@ -72,7 +72,10 @@ def extract_post_content(context_xml: str, device=None) -> dict:
 
         # 2. Learn/extract post media description dynamically
         media_node = telepath.find_best_node(
-            context_xml, "post media content (the actual image or video, exclude bottom tabs)", min_confidence=0.35, device=device
+            context_xml,
+            "post media content (the actual image or video, exclude bottom tabs)",
+            min_confidence=0.35,
+            device=device,
         )
         if media_node and media_node.get("original_attribs", {}).get("desc"):
             result["description"] = media_node["original_attribs"]["desc"].strip()
@@ -89,6 +92,11 @@ def extract_post_content(context_xml: str, device=None) -> dict:
     except Exception as e:
         logger.warning(f"Error extracting post content autonomously: {e}")
 
+    # REGRESSION FIX 2026-05-01: Flag unreliable data when username is empty
+    if not result["username"]:
+        result["username_missing"] = True
+        logger.warning("⚠️ [PostDataExtraction] Username is empty — data may be unreliable.")
+
     return result
 
 

GramAddict/core/perception/intent_resolver.py

@@ -48,10 +48,14 @@ class IntentResolver:
         Production bug 2026-04-30: VLM picked action_bar_button_back
         for "tap profile tab" → account switch failed.
 
+        Production bug 2026-05-01: VLM picked profile_tab (desc='Profile')
+        for "post author username text" → navigated to own profile instead.
+
         Rules:
         - For tab intents: exclude nodes with "back" in resource_id or
           content_desc == "Back"
         - For back/close intents: no filtering (Back is the correct target)
+        - For author/username intents: exclude bottom navigation tabs
         """
         intent_lower = intent_description.lower()
 
@@ -60,6 +64,11 @@ class IntentResolver:
         filtered = []
         is_tab_intent = "tab" in intent_lower and "back" not in intent_lower
         is_create_intent = "create" in intent_lower or "camera" in intent_lower or "story" in intent_lower
+        # REGRESSION FIX 2026-05-01: Author/username intents must never pick nav tabs
+        is_author_intent = any(kw in intent_lower for kw in ["author", "username", "post media"])
+
+        # Known bottom navigation tab resource_id suffixes
+        NAV_TAB_SUFFIXES = ("_tab", "tab_icon", "navigation_bar")
 
         for node in candidates:
             rid = (node.resource_id or "").lower()
@@ -68,6 +77,7 @@ class IntentResolver:
             is_back = "back" in rid or desc == "back"
             is_close = "close" in rid or desc == "close"
             is_create = "camera" in rid or "create" in rid or desc == "camera" or desc == "create" or "creation" in rid
+            is_nav_tab = any(rid.endswith(s) for s in NAV_TAB_SUFFIXES)
 
             if is_tab_intent and (is_back or is_close):
                 logger.debug(
@@ -76,6 +86,13 @@ class IntentResolver:
                 )
                 continue
 
+            if is_author_intent and is_nav_tab:
+                logger.debug(
+                    f"🛡️ [Author Tab Guard] Excluded nav tab '{node.resource_id}' "
+                    f"(desc='{node.content_desc}') for author intent '{intent_description}'"
+                )
+                continue
+
             if not is_create_intent and is_create:
                 logger.debug(
                     f"🛡️ [Creation Conflict Guard] Excluded '{node.resource_id}' "
@@ -374,8 +391,7 @@ class IntentResolver:
                 label_parts.append("(no visible text)")
             box_legend_lines.append(f"  [{idx}] {', '.join(label_parts)}")
         box_legend = "\n".join(box_legend_lines)
-        print("BOX LEGEND:")
-        print(box_legend)
+        logger.debug(f"BOX LEGEND:\n{box_legend}")
 
         prompt = (
             f"You are looking at a mobile app screenshot with numbered bounding boxes drawn around interactive UI elements.\n"