Adds a test case to `test/memory-formatter.test.mjs` to verify that `renderPromptWithMemoryContext` gracefully handles circular references in `agentContext` by falling back to string representation instead of throwing a JSON serialization error. This ensures the edge case at `src/services/memory/formatter.js:125` is covered.
Co-authored-by: PR0M3TH3AN <[email protected]>