derstandard: auto-track seen articles

- items now shows only NEW (unseen) articles by default
- items --all shows everything including seen
- articles command auto-marks URLs as seen
- Added seen/reset commands for state management
- State stored in memory/derstandard-seen.txt

TOOLS.md

@@ -45,20 +45,25 @@ When user arrives home, HA calls the webhook. Check `memory/arrival-reminders.js
 Helper script: `~/bin/derstandard`
 
 ```bash
-derstandard items [max]     # Title + URL pairs (tab-separated)
-derstandard article <url>   # Full article content for a specific URL
-derstandard articles <url1>,<url2>,... # Fetch multiple articles (comma-separated)
-derstandard urls [max]      # Article URLs only (default: 50)
-derstandard titles [max]    # Article titles only
-derstandard raw [max]       # Full RSS XML
+derstandard items [max]          # NEW items only (filters out seen)
+derstandard items --all [max]    # All items including already seen
+derstandard article <url>        # Full article content for a specific URL
+derstandard articles <url1>,<url2>,... # Fetch multiple + auto-mark as seen
+derstandard urls [max]           # Article URLs only (default: 50)
+derstandard titles [max]         # Article titles only
+derstandard seen                 # Show seen count and recent entries
+derstandard reset                # Clear seen history
+derstandard raw [max]            # Full RSS XML
 ```
 
 - Uses internal fivefilters proxy (bypasses web_fetch private IP block)
 - Pre-processes output for minimal token usage
+- **Auto-tracks seen articles** in `memory/derstandard-seen.txt`
 
 **Workflow for news briefing:**
-1. `derstandard items` → pick interesting titles
-2. `derstandard articles <url1>,<url2>,...` → get full content for selected articles
+1. `derstandard items` → only shows NEW articles (unseen)
+2. `derstandard articles <url1>,<url2>,...` → fetch content + auto-mark as seen
+3. Next briefing: step 1 automatically excludes previously covered articles
 
 ## Forgejo Git Access