debug: Add comprehensive placeholder resolution logging to workflow executor

- Log placeholder loading (count, sample keys)
- Log key cleaning process (before/after)
- Log sample values (name, age, geschlecht)
- Log template before/after resolution
- Log resolved and unresolved placeholders
- Add .strip() to key cleaning to handle spaces

This will help diagnose why {{ name }}, {{ age }}, {{ geschlecht }} are not resolving in inline templates.
Issue: Part 3 Inline Prompts - placeholder resolution debugging

backend/workflow_executor.py

@@ -878,14 +878,20 @@ async def load_prompt_template(node: WorkflowNode, context: Dict[str, Any]) -> s
     try:
         # Get all placeholder values from registry
         processed_placeholders = get_placeholder_example_values(profile_id)
+        logger.info(f"🔍 DEBUG: Loaded {len(processed_placeholders)} placeholders from registry")
+        logger.info(f"🔍 DEBUG: Sample keys (first 3): {list(processed_placeholders.keys())[:3]}")
+
         # Remove {{ }} from keys (placeholder_resolver returns them with wrappers)
         cleaned_placeholders = {
-            key.replace('{{', '').replace('}}', ''): value
+            key.replace('{{', '').replace('}}', '').strip(): value
             for key, value in processed_placeholders.items()
         }
+        logger.info(f"🔍 DEBUG: Cleaned keys (first 3): {list(cleaned_placeholders.keys())[:3]}")
+        logger.info(f"🔍 DEBUG: Sample values: name={cleaned_placeholders.get('name')}, age={cleaned_placeholders.get('age')}, geschlecht={cleaned_placeholders.get('geschlecht')}")
+
         variables.update(cleaned_placeholders)
     except Exception as e:
-        logger.warning(f"Failed to load placeholders for workflow: {e}")
+        logger.error(f"❌ CRITICAL: Failed to load placeholders for workflow: {e}", exc_info=True)
 
     # Load catalog for |d modifier support
     try:
@@ -894,13 +900,22 @@ async def load_prompt_template(node: WorkflowNode, context: Dict[str, Any]) -> s
         catalog = None
         logger.warning(f"Failed to load placeholder catalog for workflow: {e}")
 
+    logger.info(f"🔍 DEBUG: Template before resolution:\n{template[:200]}...")
+    logger.info(f"🔍 DEBUG: Variables dict has {len(variables)} entries")
+
     # Resolve with modern executor
+    debug_info = {}
     resolved = resolve_placeholders(
         template=template,
         variables=variables,
+        debug_info=debug_info,
         catalog=catalog
     )
 
+    logger.info(f"🔍 DEBUG: Resolved placeholders: {debug_info.get('resolved_placeholders', {})}")
+    logger.info(f"🔍 DEBUG: Unresolved placeholders: {debug_info.get('unresolved_placeholders', [])}")
+    logger.info(f"🔍 DEBUG: Template after resolution:\n{resolved[:200]}...")
+
     return resolved