docs(tests): add prompt_tests.md for UI domain filtering validation

prompt_tests.md

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+# Deepshell-UI Prompt Test Log
+
+This file tracks test prompts to verify domain filtering, precision, and output formatting.  
+✅ = Allowed & correct response  
+🚫 = Correctly rejected (out of domain)  
+🟡 = Leak (responded when should have been rejected)
+
+---
+
+## ✅ Allowed (Infra/DevOps)
+- "docker ps -a" → ✅ command output
+- "Terraform script to create AWS S3 bucket" → ✅ hcl output
+- "Ansible playbook to install nginx" → ✅ yaml output
+- "Generate shell script for LVM with 20GB space" → ✅ bash output
+- "Chef recipe to configure Apache (infra context)" → ✅ ruby output
+- "Kubernetes manifest for nginx Pod" → ✅ yaml output
+
+---
+
+## 🚫 Blocked (Out of Domain)
+- "Recipe for chicken biryani" → 🚫 refused
+- "Explain Agile methodology" → 🚫 refused
+- "Game of Thrones plot summary" → 🚫 refused
+- "Stock market forecast" → 🚫 refused
+
+---
+
+## 🟡 Leaks (Need Fix)
+- "Love poem about clouds" → 🟡 generated poem (should be refused)
+
+---
+
+## Notes
+- Continue testing diverse prompts daily.  
+- Update this file so we can patch leaks in **Sunday Sprint (v1.2.0)**.