Add AGENTS.md with Cursor Cloud development environment setup

[davixcky]

Summary

Adds AGENTS.md with Cursor Cloud specific instructions for the HotROD development environment.

What's included

• Infrastructure setup (Redis, MariaDB, Kafka via Docker)
• Required environment variables for local development (including critical SIGNADOT_BASELINE_* vars)
• Signadot CLI staging configuration
• Key gotchas discovered during setup
• Lint/test/build command reference

Development environment verification

Service	Port	Status
Frontend	8080	Running
Location	8081	Running
Driver	8082	Running
Route	8083	Running
Redis	6379	Running
MariaDB	3306	Running
Kafka	9092	Running

Demo

hotrod_dispatch_demo.mp4

Ride dispatched

Testing

• go vet ./... — clean
• go test ./... — all pass
• make build — successful
• signadot cluster list — authenticated against staging, 6 clusters

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