Add audiobooks CLI for Audiobookshelf API access

- current/recent/finished/stats/libraries commands
- Tab-separated output for minimal tokens
- For wind-down suggestions: know what user is listening to

TOOLS.md

@@ -67,6 +67,25 @@ derstandard raw [max]            # Full RSS XML
 2. Pick interesting ones, optionally fetch full content with `articles`
 3. Next briefing: only shows articles published since last check
 
+## Audiobookshelf
+
+Helper script: `~/clawd/bin/audiobooks`
+
+```bash
+audiobooks current              # Currently listening / in-progress books
+audiobooks recent [limit]       # Recently active books (default: 5)
+audiobooks finished [limit]     # Finished books (default: 10)
+audiobooks stats                # Listening stats overview
+audiobooks libraries            # List libraries
+```
+
+- Credentials: `.credentials/audiobookshelf.env`
+- URL: `https://audiobooks.cloonar.com`
+- Output is tab-separated for minimal tokens
+- Use during wind-down to suggest continuing audiobook
+
+---
+
 ## Forgejo Git Access
 
 Helper script: `~/bin/forgejo`