docs: minimize AGENTS guidance

Author: opensourcevk

AGENTS.md

@@ -1,16 +1,9 @@
 # AGENTS.md
 
-This repository is `opentelemetry-java`, the core Java API and SDK implementation for OpenTelemetry.
-
-Primary contributor guidance lives in [CONTRIBUTING.md](CONTRIBUTING.md). Read that first and treat
-it as the source of truth for repository layout, build and test commands, style expectations, and
-scope.
+Read [CONTRIBUTING.md](CONTRIBUTING.md) first. It is the source of truth for repository layout,
+build and test commands, style expectations, and scope.
 
 Additional guidance for agents:
 
 * Prefer small, localized changes over broad refactors.
-* Read the target module's `build.gradle.kts` and nearby package structure before editing.
-* Match existing package naming, visibility, and module boundaries.
-* When changing public API, check for ripple effects across `all`, BOM, incubator, exporters,
-  shims, and integration tests.
 * Mention generated outputs such as `docs/apidiffs/current_vs_latest` when they are affected.