refactor(tools): consolidate LLM tools from 42 to 38

Merge create_task into create_note (set status='todo' for tasks, omit
for notes), merge delete_task into delete_note, consolidate entity
tools (create/update_person → save_person, create/update_place →
save_place), rename get_note → read_note with clearer descriptions,
move calculate out of rag.py into utility.py, and extract shared
duplicate detection into check_duplicate() helper.

Updates all downstream references in generation_task.py, quick_capture.py,
ToolCallCard.vue, and WorkspaceView.vue.

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

frontend/src/components/ToolCallCard.vue

@@ -218,7 +218,7 @@ async function confirmDuplicate() {
   if (confirmState.value !== "idle") return;
   confirmState.value = "creating";
   const args = props.toolCall.arguments as Record<string, unknown>;
-  const isTask = props.toolCall.function === "create_task";
+  const isTask = !!(args.status);
   const endpoint = isTask ? "/api/tasks" : "/api/notes";
   const payload: Record<string, unknown> = {
     title: args.title,

frontend/src/views/WorkspaceView.vue

@@ -75,8 +75,11 @@ watch(
         noteEditorRef.value?.reload();
       }
       if (
-        ["create_task", "update_task", "create_milestone", "update_milestone"].includes(tc.function) &&
-        tc.status === "success"
+        tc.status === "success" && (
+          ["create_milestone", "update_milestone"].includes(tc.function) ||
+          (tc.function === "create_note" && tc.result?.data?.status) ||
+          (tc.function === "update_note" && tc.result?.data?.status !== undefined)
+        )
       ) {
         taskPanelRef.value?.reload();
       }