Add agent-network readme

README.md

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 **Secure.** NetBird enables secure remote access by applying granular access policies while allowing you to manage them intuitively from a single place. Works universally on any infrastructure.
 
+> ### 🤖 NetBird Agent Network (Beta)
+> Identity-aware access control for AI agents — keyless access to LLM APIs and private
+> resources over the encrypted NetBird tunnel. See [`agent-network/`](agent-network/) or
+> read the docs at **[docs.netbird.io/agent-network](https://docs.netbird.io/agent-network)**.
+
 https://github.com/user-attachments/assets/10cec749-bb56-4ab3-97af-4e38850108d2
 
 ### Self-host NetBird (video)

agent-network/README.md

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+# NetBird Agent Network
+
+Agent Network is NetBird's access control layer for AI agents and the people who run
+them. It gives every agent a real identity, tied to your identity provider (IdP), and
+governs what it can reach — the LLM APIs and AI gateways it can call, and the internal
+resources it can access. Traffic flows only over the encrypted NetBird tunnel, scoped by
+policy, with no API keys to leak.
+
+> **Beta.** Agent Network is open source and can be self-hosted on your own
+> infrastructure.
+
+## How it works
+
+Agent Network is built on two existing NetBird capabilities:
+
+- **Overlay network** — the encrypted WireGuard mesh between peers.
+- **Reverse proxy** — a NetBird peer that terminates LLM requests, establishes the
+  caller's identity, evaluates policies/limits/guardrails, injects the upstream provider
+  key server-side, forwards to the API or gateway, and records usage.
+
+LLM traffic is routed through the proxy's identity-aware pipeline, while internal
+resources (databases, internal APIs, self-hosted models) are reached directly over
+peer-to-peer WireGuard tunnels, governed by the same identities and access policies.
+
+## Where the code lives
+
+There is no separate "agent-network" service — it reuses the reverse-proxy and management
+components:
+
+- [`proxy/`](../proxy) — the NetBird reverse proxy that serves the agent network endpoint
+  and runs the per-request middleware pipeline.
+- [`management/internals/modules/reverseproxy/`](../management/internals/modules/reverseproxy)
+  — the management-side control plane: providers, policies, guardrails, limits, routing,
+  and usage/access logs.
+
+## Documentation
+
+Full documentation, architecture, and quickstart:
+**https://docs.netbird.io/agent-network**