ci: add CodeQL security analysis workflow

[atkaridarshan04]

Summary

Adds CodeQL static analysis to the CI pipeline. Runs on every PR to main, every push to main that touches app/, and weekly on a cron schedule.

Changes

• Add .github/workflows/codeql.yml — CodeQL analysis using security-extended query suite, Python language, weekly cron + PR/push triggers
• Add suppression comment in app/cli/core/inspector.py at the subprocess.run call — documents why the call is not injectable (shell=False,
  path embedded as string literal in script source, not passed as shell argument)

Type

• Chore / dependency update

Testing

• pytest passes
• Coverage ≥ 70%
• Tested manually — workflow will run as part of this PR; CodeQL check should appear in the checks list

Related Issues

Closes #8

[github-advanced-security]

You are seeing this message because GitHub Code Scanning has recently been set up for this repository, or this pull request contains the workflow file for the Code Scanning tool.

What Enabling Code Scanning Means:

• The 'Security' tab will display more code scanning analysis results (e.g., for the default branch).
• Depending on your configuration and choice of analysis tool, future pull requests will be annotated with code scanning analysis results.
• You will be able to see the analysis results for the pull request's branch on this overview once the scans have completed and the checks have passed.

For more information about GitHub Code Scanning, check out the documentation.