test(security): batch of security improvements

[mikehardy]

Summary

• Closes repo-fixable OSS health dashboard gaps: SECURITY.md + disclosure template, CODEOWNERS, Dependabot grouping, yarn npm audit (critical), gitleaks, CodeQL (JS/TS), OpenSSF Scorecard Action, and current docs/releases stub for v26.3.1.
• Does not enable Dependabot security updates (OH3, GitHub UI) or required reviewers on Production environments (OH11). Org 2FA / default repo permission remain deferred (org admin).
• Re-run OSS health (OHV) after this lands on main; dashboard checks that need analyses on the default branch (CodeQL, Scorecard) will not turn green from the YAML alone until then.

Test plan

• Confirm new workflows YAML-parse and SHA pins match tagged actions
• After merge: CodeQL + Scorecard + gitleaks jobs run on main
• Enable Dependabot security updates at repo Security settings (OH3)
• Optional: required reviewers on Production environments (OH11)
• Re-run OSS health pipeline and attach before/after (OHV)

[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.

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 68.40%. Comparing base (af89e27) to head (06f5c71).

Additional details and impacted files

@@             Coverage Diff              @@
##               main    #9210      +/-   ##
============================================
+ Coverage     68.36%   68.40%   +0.05%     
- Complexity     1914     1915       +1     
============================================
  Files           516      516              
  Lines         37853    37853              
  Branches       5183     5183              
============================================
+ Hits          25874    25891      +17     
+ Misses        10189    10177      -12     
+ Partials       1790     1785       -5     

Flag	Coverage Δ
android-native	63.76% <ø> (+0.01%)	⬆️
e2e-ts-android	54.15% <ø> (+0.06%)	⬆️
e2e-ts-ios	53.51% <ø> (ø)
e2e-ts-macos	49.68% <ø> (+0.01%)	⬆️
ios-native	68.79% <ø> (+0.09%)	⬆️
ios-ruby	100.00% <ø> (ø)
jest	45.48% <ø> (ø)

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