Associate research_topic notes with workspace project

run_research_pipeline now accepts project_id; generation_task.py passes
workspace_project_id when the tool is called from a workspace context.

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

src/fabledassistant/services/generation_task.py

@@ -260,7 +260,7 @@ async def run_generation(
                         if tool_name == "research_topic":
                             topic = arguments.get("topic", "")
                             try:
-                                note = await run_research_pipeline(topic, user_id, model, buf)
+                                note = await run_research_pipeline(topic, user_id, model, buf, project_id=workspace_project_id)
                                 result = {
                                     "success": True,
                                     "type": "research_note",

src/fabledassistant/services/research.py

@@ -26,6 +26,7 @@ async def run_research_pipeline(
     user_id: int,
     model: str,
     buf=None,
+    project_id: int | None = None,
 ) -> Note:
     """Full research pipeline: search → fetch → synthesize → create note.
 
@@ -112,6 +113,7 @@ async def run_research_pipeline(
         title=title,
         body=body,
         tags=["research"],
+        project_id=project_id,
     )
     logger.info("Research: created note id=%d title='%s'", note.id, note.title)
     return note