[codex] fix handlebars dependabot alert

[szdziedzic]

Why

Dependabot reported security alert 334 for the transitive dev dependency handlebars (GHSA-2w6w-674q-4c4q, CVE-2026-33937). The existing lockfile resolved the ^4.7.7 and ^4.7.8 ranges to vulnerable 4.7.8; 4.7.9 is the patched release.

How

Re-resolved handlebars with Yarn so the lockfile now pins handlebars@4.7.9 for the existing transitive ranges. Added a main changelog chore entry for the security bump.

Test Plan

• corepack yarn fmt
• corepack yarn install --immutable
• corepack yarn why handlebars
• corepack yarn lint-changelog
• git diff --check

corepack yarn install --immutable still reports the same pre-existing peer dependency warnings for graphql, oxlint-tsgolint, eslint, and @types/node.

[github-actions]

✅ Thank you for adding the changelog entry!

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 59.32%. Comparing base (a848411) to head (7fa7571).
⚠️ Report is 1 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #3958      +/-   ##
==========================================
+ Coverage   59.28%   59.32%   +0.05%     
==========================================
  Files         935      936       +1     
  Lines       41093    41169      +76     
  Branches     8660     8670      +10     
==========================================
+ Hits        24356    24421      +65     
- Misses      16643    16654      +11     
  Partials       94       94              

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[github-actions]

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