feat: Add dependency review workflow and CODEOWNERS

[vijayCarta]

Summary

• Add a local dependency-review.yml workflow using actions/dependency-review-action@v4 since the org-level required workflow references a private repo that public repos cannot access
• Add CODEOWNERS file assigning @carta/ai-artifacts as default owners for all files

Changes Made

• .github/workflows/dependency-review.yml — Runs on PRs targeting main, fails on moderate+ severity vulnerabilities, and posts a comment summary on every PR
• CODEOWNERS — Sets @carta/ai-artifacts as the default code owner, enabling GitHub's code owner ruleset for review requirements

Test plan

• Open a PR that adds/changes a dependency and verify the dependency review check runs
• Verify CODEOWNERS triggers review requests to @carta/ai-artifacts

Related

• Supports re-enabling org-level reviewer and code owner branch protection rulesets on this public repo

🤖 Generated with Claude Code

[github-actions]

Dependency Review

The following issues were found:

• ✅ 0 vulnerable package(s)
• ✅ 0 package(s) with incompatible licenses
• ✅ 0 package(s) with invalid SPDX license definitions
• ⚠️ 2 package(s) with unknown licenses.

See the Details below.

Snapshot Warnings

⚠️: No snapshots were found for the head SHA 8741968.

Ensure that dependencies are being submitted on PR branches and consider enabling retry-on-snapshot-warnings. See the documentation for more information and troubleshooting advice.

License Issues

.github/workflows/dependency-review.yml

Package	Version	License	Issue Type
actions/checkout	4.*.*	Null	Unknown License
actions/dependency-review-action	4.*.*	Null	Unknown License

OpenSSF Scorecard

Package	Version	Score	Details
actions/actions/checkout	4.*.*	🟢 6	Details Check Score Reason Maintained ⚠️ 2 3 commit(s) and 0 issue activity found in the last 90 days -- score normalized to 2 Code-Review 🟢 10 all changesets reviewed Binary-Artifacts 🟢 10 no binaries found in the repo Dangerous-Workflow 🟢 10 no dangerous workflow patterns detected CII-Best-Practices ⚠️ 0 no effort to earn an OpenSSF best practices badge detected Token-Permissions ⚠️ 0 detected GitHub workflow tokens with excessive permissions Packaging ⚠️ -1 packaging workflow not detected License 🟢 10 license file detected Fuzzing ⚠️ 0 project is not fuzzed Signed-Releases ⚠️ -1 no releases found Pinned-Dependencies 🟢 3 dependency not pinned by hash detected -- score normalized to 3 Security-Policy 🟢 9 security policy file detected Branch-Protection 🟢 6 branch protection is not maximal on development and all release branches SAST 🟢 8 SAST tool detected but not run on all commits
actions/actions/dependency-review-action	4.*.*	🟢 7.8	Details Check Score Reason Packaging ⚠️ -1 packaging workflow not detected Code-Review 🟢 10 all changesets reviewed Maintained 🟢 10 30 commit(s) and 0 issue activity found in the last 90 days -- score normalized to 10 Dangerous-Workflow 🟢 10 no dangerous workflow patterns detected Binary-Artifacts 🟢 10 no binaries found in the repo Security-Policy 🟢 9 security policy file detected Token-Permissions 🟢 9 detected GitHub workflow tokens with excessive permissions CII-Best-Practices ⚠️ 0 no effort to earn an OpenSSF best practices badge detected Pinned-Dependencies ⚠️ 1 dependency not pinned by hash detected -- score normalized to 1 Fuzzing ⚠️ 0 project is not fuzzed License 🟢 10 license file detected Signed-Releases ⚠️ -1 no releases found Branch-Protection 🟢 6 branch protection is not maximal on development and all release branches SAST 🟢 10 SAST tool is run on all commits

Scanned Files

• .github/workflows/dependency-review.yml