Add SECURITY.md + AGENTS.md linking the Apache Directory umbrella threat model for discoverability

AGENTS.md

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+<!--
+SPDX-License-Identifier: Apache-2.0
+
+Licensed to the Apache Software Foundation (ASF) under the Apache License, Version 2.0.
+See the umbrella threat model and SECURITY.md for security guidance.
+-->
+
+# Agent Guide for directory-studio
+
+## Security
+
+Security model: [SECURITY.md](./SECURITY.md) -> the Apache Directory umbrella threat
+model at https://github.com/apache/directory-server/blob/master/THREAT_MODEL.md
+
+This repository is the Eclipse-based LDAP client tool (desktop). Agents scanning it should consult the umbrella threat
+model (client-tooling note) before reporting issues.

SECURITY.md

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+<!--
+SPDX-License-Identifier: Apache-2.0
+
+Licensed under the Apache License, Version 2.0 (the "License");
+you may not use this file except in compliance with the License.
+You may obtain a copy of the License at
+
+    https://www.apache.org/licenses/LICENSE-2.0
+
+Unless required by applicable law or agreed to in writing, software
+distributed under the License is distributed on an "AS IS" BASIS,
+WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+See the License for the specific language governing permissions and
+limitations under the License.
+-->
+
+# Security Policy
+
+## Reporting a Vulnerability
+
+Apache Directory follows the [ASF security process](https://www.apache.org/security/). Report privately to
+`security@apache.org` (PMC: `private@directory.apache.org`); do not open public issues/PRs for security reports.
+
+## Threat Model
+
+`apache/directory-studio` is the Eclipse-based LDAP client tool (desktop) within the Apache Directory project. Its security context is covered by the Apache
+Directory umbrella threat model (client-tooling note): https://github.com/apache/directory-server/blob/master/THREAT_MODEL.md