updated docs

docs/data/en/artery-slack.md

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+# Slack Vein
+
+Status: **building**
+
+Will connect soleprint to Slack for channel messaging and notifications.
+
+---
+
+## What Exists
+
+The vein structure is in place: config, client, auth, models, routes. Bot token and user token configuration is ready.
+
+```env
+SLACK_BOT_TOKEN=xoxb-...
+SLACK_USER_TOKEN=xoxp-...
+API_PORT=8002
+```
+
+## What's Coming
+
+- Send messages to channels
+- Read channel history
+- Notification integration with other soleprint tools
+
+Configuration details will be added as the integration matures.
+
+## Running Standalone
+
+```bash
+cd soleprint/artery/veins/slack
+python run.py
+# Runs on port 8002
+```