ci(security): add same-repo PR guard for self-hosted runners

[hummbl-dev]

Summary

Combined runner-fleet hardening:

• Add same-repo PR guard to self-hosted jobs with pull_request triggers
  (blocks fork PRs from executing on self-hosted runners)

Changed files

• .github/workflows/base120.yml
• .github/workflows/ci.yml
• .github/workflows/guardrails.yml
• .github/workflows/mirror-conformance.yml

Test plan

• CI workflows run successfully
• Fork PRs do not trigger self-hosted runner jobs

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Review details

⚙️ Run configuration

Configuration used: Organization UI

Review profile: ASSERTIVE

Plan: Pro Plus

Run ID: 9e019a9d-b435-474c-b51a-4d54e7bc65fe

📥 Commits

Reviewing files that changed from the base of the PR and between 412c8f9 and 928ad63.

📒 Files selected for processing (4)

• .github/workflows/base120.yml
• .github/workflows/ci.yml
• .github/workflows/guardrails.yml
• .github/workflows/mirror-conformance.yml

✨ Finishing Touches

🧪 Generate unit tests (beta)

• Create PR with unit tests
• Commit unit tests in branch ci/runner-fleet-hardening

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