aitools: fix MCP tool reference style in AGENTS.tmpl (#4317)

## Changes

Use consistent tool reference style (`call the `databricks_discover`
tool`) matching other prompts instead of Claude Code-specific
`mcp__databricks-mcp__` prefix notation.

Co-authored-by: Claude Opus 4.5 <noreply@anthropic.com>
Co-authored-by: Pieter Noordhuis <pieter.noordhuis@databricks.com>

Author: 3 people

experimental/aitools/lib/prompts/AGENTS.tmpl

@@ -15,7 +15,7 @@ This project uses Databricks Asset Bundles for deployment. Add project-specific
 
 ## For AI Agents: MANDATORY First Action
 
-**BEFORE any other action, call `mcp__databricks-mcp__databricks_discover` with this project's path.**
+**BEFORE any other action, call the `databricks_discover` tool with this project's path.**
 
 This is required because the discover tool:
 - Detects project state (new, deployed, running) and provides relevant guidance