feat: deduplicate / concise testsupport/AGENTS.md

Author: afranken

testsupport/AGENTS.md

@@ -1,5 +1,7 @@
 # Agent Context for S3Mock Test Support
 
+> Inherits all conventions from the [root AGENTS.md](../AGENTS.md). Below are module-specific additions only.
+
 Test framework integrations for using S3Mock: JUnit 5, Testcontainers, TestNG.
 
 > **Deprecation Notice (6.x):** The JUnit 5, TestNG, and all direct-integration modules will be
@@ -8,22 +10,16 @@ Test framework integrations for using S3Mock: JUnit 5, Testcontainers, TestNG.
 
 ## Framework Selection
 
-- **Testcontainers** (`testcontainers/`) - Docker container isolation, works with any framework. **Recommended.**
-- **JUnit 5** (`junit5/`) - Extension with parameter injection. Will be removed in 6.x.
-- **TestNG** (`testng/`) - Listener-based integration. Will be removed in 6.x.
-- **Common** (`common/`) - Shared `S3MockStarter` base class and utilities.
-
-> **Note:** JUnit 4 support (`junit4/`) was removed in 5.x.
+- **Testcontainers** (`testcontainers/`) — Docker container isolation, works with any framework. **Recommended.**
+- **JUnit 5** (`junit5/`) — Extension with parameter injection. Will be removed in 6.x.
+- **TestNG** (`testng/`) — Listener-based integration. Will be removed in 6.x.
+- **Common** (`common/`) — Shared `S3MockStarter` base class and utilities.
 
-## DO / DON'T
+## Module-Specific Rules
 
-### DO
 - Prefer **Testcontainers** for new test setups — it provides the best isolation
 - Keep framework modules **thin** — delegate to `common/` for shared logic
 - Maintain backward compatibility for existing public APIs
-
-### DON'T
-- DON'T add new features to `junit4/` — it has been removed in 5.x
 - DON'T invest heavily in `junit5/` or `testng/` — they will be removed in 6.x
 - DON'T add framework-specific logic that belongs in `common/`
 
@@ -74,16 +70,3 @@ val endpoint = System.getProperty("s3mock.httpEndpoint")
 ```
 
 Parameters: `s3mock.httpPort` (9090), `s3mock.httpsPort` (9191), `s3mock.initialBuckets`, `s3mock.root`.
-
-## Design Principles
-
-1. Framework-agnostic core in `common` module
-2. Simple API with sensible defaults
-3. Proper lifecycle management (start before tests, stop after)
-4. Resource cleanup after tests
-
-## Common Issues
-
-- **Not starting**: Check ports 9090/9191 availability, Docker running (Testcontainers)
-- **Connection refused**: Verify S3Mock started, correct endpoint URL
-- **Test interference**: Use unique bucket names (UUID), ensure test isolation