Add AGENTS.md with Cursor Cloud development environment instructions

[ccycv]

Summary

Adds AGENTS.md with Cursor Cloud specific instructions for setting up and running PostgreSQL 16 using the repository's postgresql.conf.

Changes

• Added AGENTS.md with:
  • Service overview (PostgreSQL 16 only)
  • Startup commands to deploy the config and start the service
  • Key non-default configuration values documented
  • Gotchas for SSL cert requirements and peer authentication

Verification

PostgreSQL 16 was installed, started with the repo's config, and validated:

• max_connections = 1000 ✅
• shared_buffers = 128MB ✅
• ssl = on ✅
• port = 5432 ✅
• Created database, table, inserted and queried data successfully ✅

postgresql_hello_world.log

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