replace todo.md references with vik CLI across daily-briefing, shutdown-routine, weekly-review

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

daily-briefing/SKILL.md

@@ -1,6 +1,6 @@
 ---
 name: daily-briefing
-description: Morning briefing that pulls today's tasks from ~/notes/todo.md and gives a clear picture of what's on deck.
+description: Morning briefing that pulls today's tasks from Vikunja via vik and gives a clear picture of what's on deck.
 triggers:
   - run my briefing
   - morning briefing
@@ -18,28 +18,26 @@ Run this at the start of your day.
 
 ## Instructions
 
-1. Read `~/notes/todo.md`.
-2. Identify tasks marked for today or with no specific date (treat undated tasks as fair game for today).
-3. Identify any overdue tasks (past their date if dated).
-4. Produce the briefing below.
+1. Run `vik task today` to get tasks due or starting today.
+2. Run `vik task upcoming` to get tasks coming up later this week.
+3. Produce the briefing below.
 
 ### Output Format
 
 **Daily Briefing — [Weekday, Month Day]**
 
 **Today's Tasks**
-[Tasks from todo.md that are due today or are undated and in progress. Numbered list.]
+[Tasks from `vik task today`. Numbered list.]
 
 **Overdue**
 [Any tasks past their due date. Flag these clearly.]
 
 **Later This Week**
-[Tasks with future dates this week, so you know what's coming.]
+[Tasks from `vik task upcoming` with future dates this week.]
 
 ## Rules
 
 - Keep it scannable. Short lines, clear sections.
-- If todo.md doesn't exist yet, say so and offer to create it.
 - Don't editorialize. Present the tasks as written. Let Connor decide priorities.
 - Overdue items always appear, even if the list is long.
 - If there are no tasks in a section, omit that section header.