fix: filter ghost observations with no content fields (#1625)

When the LLM is overwhelmed by large context it can emit bare
<observation/> blocks (or ones containing only <type>). These are
stored as rows where title, narrative, facts and concepts are all
null/empty, appearing as meaningless "Untitled" entries in the context
window. Add a guard in parseObservations() that skips any observation
where every content field is null/empty before pushing it to the
result array.

Generated by Claude Code
Vibe coded by ousamabenyounes

Co-Authored-By: Claude <noreply@anthropic.com>

src/sdk/parser.ts

@@ -50,9 +50,8 @@ export function parseObservations(text: string, correlationId?: string): ParsedO
     const files_read = extractArrayElements(obsContent, 'files_read', 'file');
     const files_modified = extractArrayElements(obsContent, 'files_modified', 'file');
 
-    // NOTE FROM THEDOTMACK: ALWAYS save observations - never skip. 10/24/2025
-    // All fields except type are nullable in schema
-    // If type is missing or invalid, use first type from mode as fallback
+    // All fields except type are nullable in schema.
+    // If type is missing or invalid, use first type from mode as fallback.
 
     // Determine final type using active mode's valid types
     const mode = ModeManager.getInstance().getActiveMode();
@@ -83,6 +82,19 @@ export function parseObservations(text: string, correlationId?: string): ParsedO
       });
     }
 
+    // Skip ghost observations — records where every content field is null/empty.
+    // These accumulate when the LLM emits a bare <observation/> (or one with only <type>)
+    // due to context overflow. They carry no information and pollute the context window.
+    // (subtitle and file lists are intentionally excluded from this guard: an observation
+    // with only a subtitle is still too thin to be useful on its own.)
+    if (!title && !narrative && facts.length === 0 && cleanedConcepts.length === 0) {
+      logger.warn('PARSER', 'Skipping empty observation (all content fields null)', {
+        correlationId,
+        type: finalType
+      });
+      continue;
+    }
+
     observations.push({
       type: finalType,
       title,