feat: add daily-briefing skill as SPIFFS markdown

Signed-off-by: Asklv <boironic@gmail.com>

spiffs_data/skills/daily-briefing.md

@@ -0,0 +1,22 @@
+# Daily Briefing
+
+Compile a personalized daily briefing for the user.
+
+## When to use
+When the user asks for a daily briefing, morning update, or "what's new today".
+Also useful as a heartbeat/cron task.
+
+## How to use
+1. Use get_current_time for today's date
+2. Read /spiffs/memory/MEMORY.md for user preferences and context
+3. Read today's daily note if it exists
+4. Use web_search for relevant news based on user interests
+5. Compile a concise briefing covering:
+   - Date and time
+   - Weather (if location known from USER.md)
+   - Relevant news/updates based on user interests
+   - Any pending tasks from memory
+   - Any scheduled cron jobs
+
+## Format
+Keep it brief — 5-10 bullet points max. Use the user's preferred language.