fix: fuzzy project resolution and guard against accidental project creation

- _resolve_project now uses reverse-substring + SequenceMatcher (≥0.55)
  so partial names like "Famous Supply" match "Famous Supply Co." reliably
- create_project runs similar-project checks before the confirmed gate so
  confirmed=true can't bypass them; threshold lowered to 0.55 to catch
  abbreviated names
- Error messages on project-not-found no longer suggest create_project,
  directing the model to list_projects first
- Tool description updated to explicitly prohibit calling create_project
  in response to a lookup failure
- tasks.py: fire-and-forget embedding update on create/update
- briefing_pipeline.py: await is_caldav_configured (was sync call)
- notes.py: remove erroneous duplicate count_query filter

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

src/fabledassistant/routes/tasks.py

@@ -1,8 +1,11 @@
+import asyncio
+
 from quart import Blueprint, jsonify, request
 
 from fabledassistant.auth import login_required, get_current_user_id
 from fabledassistant.models.note import TaskPriority, TaskStatus
 from fabledassistant.routes.utils import not_found, parse_iso_date
+from fabledassistant.services.embeddings import upsert_note_embedding
 from fabledassistant.services.notes import (
     create_note,
     delete_note,
@@ -93,6 +96,9 @@ async def create_task_route():
         milestone_id=data.get("milestone_id"),
         parent_id=data.get("parent_id"),
     )
+    text = f"{task.title}\n{task.body}".strip() if task.body else (task.title or "")
+    if text:
+        asyncio.create_task(upsert_note_embedding(task.id, uid, text))
     return jsonify(task.to_dict()), 201
 
 
@@ -147,6 +153,9 @@ async def update_task_route(task_id: int):
     task = await update_note(uid, task_id, **fields)
     if task is None:
         return not_found("Task")
+    text = f"{task.title}\n{task.body}".strip() if task.body else (task.title or "")
+    if text:
+        asyncio.create_task(upsert_note_embedding(task.id, uid, text))
     return jsonify(task.to_dict())