add user id for pings

CLAUDE.md

@@ -29,10 +29,13 @@ The entire implementation is a single Babashka script (`iamwaiting`) with these
 Configuration is stored in `~/.iamwaiting/config.edn` with the following structure:
 
 ```clojure
-{:webhook-url "https://discord.com/api/webhooks/..."}
+{:webhook-url "https://discord.com/api/webhooks/..."
+ :user-id "123456789012345678"}  ; Optional: Discord user ID for @mentions
 ```
 
-Alternatively, the webhook URL can be set via the `IAMWAITING_WEBHOOK_URL` environment variable.
+Alternatively, configuration can be set via environment variables:
+- `IAMWAITING_WEBHOOK_URL` - Discord webhook URL (required)
+- `IAMWAITING_USER_ID` - Discord user ID for @mentions (optional)
 
 ## Installation
 
@@ -114,14 +117,23 @@ Notifications include:
 - ⏳ Waiting indicator
 - 📁 Current working directory / project name
 - 🕐 Timestamp (HH:mm:ss format)
+- @mention (if user ID is configured and it's a permission prompt)
 
-Example message:
+Example message (normal prompt):
 ```
 ⏳ **Claude is waiting** in `ajet-industries`
 📁 Path: `/home/user/repos/ajet-industries`
 🕐 Time: 14:23:45
 ```
 
+Example message (permission prompt with user ID configured):
+```
+<@123456789012345678> ⏳ **Claude is waiting** in `ajet-industries`
+📁 Path: `/home/user/repos/ajet-industries`
+🕐 Time: 14:23:45
+📢 Type: `permission_prompt`
+```
+
 ### Error Handling
 
 - Missing configuration prompts user to run `./iamwaiting setup`