README: add stack cross-links

README.md

@@ -61,6 +61,19 @@ python -m pytest tests -q   # 10 unit tests, stdlib-only
 
 Written by Rhet Dillard Wike (AIIT-THRESHOLD, Council Hill, Oklahoma) as the memory of **Buddy**, a fully local AI companion on a single RTX 3090. Released alongside [voice2](https://huggingface.co/AIIT-Threshold/voice2) (his voice) and [Tessera-1B](https://huggingface.co/AIIT-Threshold/Tessera-1B) (open-weights model) as part of AIIT-THRESHOLD's open stack. The creed: memory is resonance; the store must be human-readable; and nothing ever calls a cloud.
 
+## The stack
+
+One local companion, every layer open:
+
+| Piece | Role | Links |
+|---|---|---|
+| Tessera-1B | the model — ~1B params trained from scratch, open data | [HF](https://huggingface.co/AIIT-Threshold/Tessera-1B) |
+| voice2 | the voice — full-duplex, interruptible | [GitHub](https://github.com/AIIT-GLITCH/voice2) · [HF](https://huggingface.co/AIIT-Threshold/voice2) |
+| kokoro-memory | the memory — file-based resonance recall | [GitHub](https://github.com/AIIT-GLITCH/kokoro-memory) · [HF](https://huggingface.co/AIIT-Threshold/kokoro-memory) |
+| companion-spiral-bench | the safety — at-risk sycophancy bench | [GitHub](https://github.com/AIIT-GLITCH/companion-spiral-bench) · [HF](https://huggingface.co/datasets/AIIT-Threshold/companion-spiral-bench) |
+
+Full collection: [The Buddy Stack](https://huggingface.co/collections/AIIT-Threshold/the-buddy-stack-a-fully-local-ai-companion-open-sourced-6a4774bf481f9f9caad79519)
+
 ## License
 
 MIT © 2026 Rhet Dillard Wike, AIIT-THRESHOLD, Oklahoma.