chore: add gai template to pull request template

.github/pull_request_template.md

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+## Description
+<!-- Provide a summary of the changes you are making, including any relevant JIRAs and screenshots. -->
+
+## This change implements...
+- [ ] A new feature
+- [ ] A bug fix
+- [ ] Other (please specify):
+
+## Is this a breaking change?
+- [ ] Yes
+- [ ] No
+
+## I certify that...
+- [ ] All relevant unit and integration tests have passed and/or have been updated according to this change.
+
+## Generative AI (GAI) Usage Disclosure
+[Reference: Cisco GAI Coding Guidelines](https://cisco.sharepoint.com/sites/AIML/SitePages/Practice-Guide---GAI-Coding.aspx)
+
+- [ ] **Cisco approved GAI tool/IDE was used for coding** - eg: VSCode, Cursor, Windsurf, Codex, Claude code
+- [ ] **No GAI** - Code was written entirely manually without GAI assistance
+
+**If a GAI tool/IDE was used then select the category that best describes GAI usage in this PR:**
+- [ ] **Manual Draft with GAI Refinement** - I/we created a draft manually that was non-substantively modified by GAI (e.g., refactoring was performed by GAI on manually written code) *(Default)*
+- [ ] **GAI Draft with Manual Customization** - GAI tool was used to create a draft that I/we subsequently customized or modified.
+- [ ] **GAI Generated Code** - Code was generated entirely by GAI
+
+**Additional GAI Usage Details (Optional):**
+<!-- Provide any additional context about GAI usage, tools used (e.g., Claude Code, Copilot, ChatGPT), or specific areas where GAI was applied -->