chore: consolidate new foundation and archive v1 (#1495)

v1/docs/DEVELOPER-GUIDE/architecture/rfcs/README.md

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+---
+kind: guide
+status: active
+---
+
+# Architecture RFCs
+
+> **Status:** Current proposal index. RFCs are draft design material and have no operational or implementation authority until an approved decision and implementation evidence supersede them.
+
+## Draft proposals
+
+- [Optional AI egress gateways](optional-ai-egress-gateways.md) — proposed model-egress boundary; LiteLLM and Bifrost are not integrated, and Claudex remains experimental harness tooling.
+
+A draft RFC must not be cited as a supported feature, deployment path, or approved architecture decision. Approved implemented boundaries belong under [`../decisions/`](../decisions/README.md).
+
+## Related
+
+- [[DEVELOPER-GUIDE/architecture/README|Architecture index]]
+- [[DEVELOPER-GUIDE/architecture/decisions/README|Architecture decisions]]
+- [[PRD|Product requirements]]