ci: scope down GitHub Token permissions

[AdnaneKhan]

Scope Down GitHub Token Permissions

This PR updates GitHub Actions workflows to use minimal required permissions instead of the default elevated permissions.

Why This Matters

Following the principle of least privilege, workflows should only have the specific permissions they need to function.

Changes

This PR adds explicit permissions: blocks to workflows that currently rely on default permissions, scoping them down to only what's required for their operations.

Please review the changes to ensure the specified permissions match your workflow requirements.

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 32.61%. Comparing base (31fd3fc) to head (7caa377).

Additional details and impacted files

@@           Coverage Diff           @@
##             main     #279   +/-   ##
=======================================
  Coverage   32.61%   32.61%           
=======================================
  Files         100      100           
  Lines        4627     4627           
  Branches      589      589           
=======================================
  Hits         1509     1509           
  Misses       2962     2962           
  Partials      156      156           

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