ci: lift OSSF Scorecard score (3.7 → ~6.5+)

[aksOps]

Summary

Bundles all the scorecard wins that don't require time or external review history:

• SECURITY.md — Security-Policy 0→10
• .github/dependabot.yml (gomod + npm + actions, weekly) — Dependency-Update-Tool 0→10
• .github/workflows/codeql.yml — explicit CodeQL workflow with push trigger (fixes SAST detection) → SAST 0→10
• SHA-pin all actions in ci.yml, release.yml, scorecard.yml → Pinned-Dependencies 4→10
• Per-job permissions scoping → Token-Permissions 0→10

Branch protection on `main` applied via API (out-of-band): linear history required, force-push/delete blocked, required status checks on 4 CI jobs, dismiss stale reviews → Branch-Protection 3→10.

Projected score

3.7 → ~6.5 from this PR alone. Remaining gaps (Maintained, Code-Review, Contributors, Fuzzing, CII-Best-Practices) are time- or process-bound and can't be fixed in a single PR.

Test plan

• CI passes
• After merge, scorecard re-runs → confirm new score on badge

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ℹ️ Review info

⚙️ Run configuration

Configuration used: defaults

Review profile: CHILL

Plan: Pro

Run ID: adf0bb50-3c50-4737-94dc-f30f9e40d7f1

📥 Commits

Reviewing files that changed from the base of the PR and between 42d091a and a819328.

📒 Files selected for processing (6)

• .github/dependabot.yml
• .github/workflows/ci.yml
• .github/workflows/codeql.yml
• .github/workflows/release.yml
• .github/workflows/scorecard.yml
• SECURITY.md

✨ Finishing Touches

🧪 Generate unit tests (beta)

• Create PR with unit tests
• Commit unit tests in branch ci-scorecard-lift

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