Add explicit permissions to Copilot workflows for repo read and issue creation

Co-authored-by: raykao <860691+raykao@users.noreply.github.com>

Author: Copilot

.github/workflows/copilot.generate-docs.yml

@@ -9,6 +9,9 @@ on:
 jobs:
   generate-docs:
     runs-on: ubuntu-latest
+    permissions:
+      contents: read    # Required to read repository content and commit diffs
+      issues: write     # Required to create GitHub issues for documentation recommendations
 
     steps:
       - name: Checkout code

.github/workflows/copilot.generate-tests.yml

@@ -14,6 +14,9 @@ on:
 jobs:
   generate-tests:
     runs-on: ubuntu-latest
+    permissions:
+      contents: read    # Required to read repository content and commit diffs
+      issues: write     # Required to create GitHub issues for test coverage recommendations
 
     steps:
       - name: Checkout code