Add disclaimer about use of generative AI to templates and pull requests

.github/ISSUE_TEMPLATE/bug_report.md

@@ -7,6 +7,12 @@ assignees: ''
 
 ---
 
+## Use of generative AI
+
+_Please refer to our [temporary spack-stack AI policy](https://github.com/JCSDA/spack-stack/issues/2196) for further information._
+
+- [ ] I confirm that this contribution was submitted by a real person. If AI tools or agents were used in its preparation, I have personally reviewed and take responsibility for all submitted content, code, and proposed changes. This contribution is not autonomously generated by AI.
+
 ## Description
 
 _A clear and concise description of what the bug is._

.github/ISSUE_TEMPLATE/feature_request.md

@@ -7,6 +7,12 @@ assignees: ''
 
 ---
 
+## Use of generative AI
+
+_Please refer to our [temporary spack-stack AI policy](https://github.com/JCSDA/spack-stack/issues/2196) for further information._
+
+- [ ] I confirm that this contribution was submitted by a real person. If AI tools or agents were used in its preparation, I have personally reviewed and take responsibility for all submitted content, code, and proposed changes. This contribution is not autonomously generated by AI.
+
 ## Is your feature request related to a problem?
 
 _A clear and concise description of what the problem is. Ex. I'm always frustrated when [...]_

.github/ISSUE_TEMPLATE/install_request.yml

@@ -10,6 +10,14 @@ body:
       value: |
         Please search to see if an issue already exists for the software you are requesting to be installed.
 
+  - type: checkboxes
+    attributes:
+      label: AI Policy Acknowledgment
+      description: Please acknowledge the spack-stack AI contribution policy before submitting this request.
+      options:
+        - label: I confirm that this contribution was submitted by a real person. If AI tools or agents were used in its preparation, I have personally reviewed and take responsibility for all submitted content, code, and proposed changes. This contribution is not autonomously generated by AI.
+          required: true
+
   - type: input
     attributes:
       label: Package name

.github/pull_request_template.md

@@ -1,3 +1,9 @@
+## Use of generative AI
+
+_Please refer to our [temporary spack-stack AI policy](https://github.com/JCSDA/spack-stack/issues/2196) for further information._
+
+- [ ] I confirm that this contribution was submitted by a real person. If AI tools or agents were used in its preparation, I have personally reviewed and take responsibility for all submitted content, code, and proposed changes. This contribution is not autonomously generated by AI.
+
 ## Description
 
 _Note. The title and description will be used as commit log title and message for squash merges._

AGENTS.md

@@ -0,0 +1,9 @@
+# AGENTS.md - spack-stack
+
+## Temporary AI policy
+
+Refer to https://github.com/JCSDA/spack-stack/issues/2196
+
+The spack-stack project, including its submodules spack and spack-packages, requires all GitHub contributions—including issues, pull requests, discussions, and comments—to be submitted by a real person.
+
+Contributions that are developed with the assistance of large language models (LLMs) or AI agents are welcome, provided that a human author has reviewed and remains responsible for the language, code, and other proposed changes. Fully autonomous AI-generated contributions will be rejected. The spack-stack maintainers may also reject, at their sole discretion, contributions that contain excessive prose or otherwise indicate insufficient human review.