fix: reinforce no-project-inference in system prompt; filter tool messages from title generation

src/fabledassistant/services/llm.py

@@ -538,6 +538,11 @@ async def build_context(
         "Delete tools require an explicit user request. "
         "Never proactively search notes or comment on absent context."
     )
+    tool_lines.append(
+        "IMPORTANT: When creating tasks or notes, NEVER infer or guess a project name. "
+        "Only set the project parameter if the user explicitly names a project. "
+        "If the user says 'create a task to buy milk', do NOT assign it to a project."
+    )
     tool_guidance = "\n".join(tool_lines)
 
     static_block = (