fix(deps): remediate PROD-5139 dependency vulnerabilities

[plural-copilot]

Summary

• Remediate the Dependabot/security findings tracked by PROD-5139 with a focused dependency-only update.
• Pin the direct postcss devDependency from 8.5.22 to the first fixed version, 8.5.23, while preserving overrides.postcss: "$postcss".
• Resolve the sole transitive js-yaml package from 4.3.0 to the first fixed version, 4.3.1, through the unchanged eslint@9.27.0 -> @eslint/eslintrc@3.3.4 -> js-yaml ^4.1.1 path. No js-yaml override is needed because the existing range already permits 4.3.1.

Fixes PROD-5139

Security context

• Relevant upstream advisory identified for PostCSS: GHSA-fxqj-9mxf-q32m.
• No Dependabot alert number or relevant js-yaml GHSA identifier was present in the repository/dependency advisory metadata, so none is asserted here.

Version evidence

• package.json: devDependencies.postcss is exactly 8.5.23; overrides.postcss remains $postcss.
• package-lock.json (lockfileVersion 3): node_modules/postcss is 8.5.23 and the only node_modules/js-yaml is 4.3.1.
• eslint remains 9.27.0; @eslint/eslintrc remains 3.3.4; no unrelated dependencies changed.

Changed files

• package.json — direct PostCSS pin only.
• package-lock.json — matching PostCSS resolution and the single js-yaml resolution only.

Validation

• npm ci — passed (exit 0; 810 packages installed in 29s). It emitted non-failing deprecation, audit, allow-scripts, and Husky-without-git-container notices.
• npm run lint — passed (exit 0).
• npm run build — passed (exit 0). Next.js emitted one non-failing NFT tracing warning from next.config.ts; compilation, TypeScript, and static page generation completed successfully.

[plural-copilot]

This PR was generated by the codex Plural Agent Runtime. Here's some useful information you might want to know to evaluate the ai's perfomance:

Name	Details
💬 Prompt	Implement the remediation for Linear PROD-5139 in a single focused PR....
🔗 Run history	View run history

[linear]

PROD-5139

[socket-security]

Review the following changes in direct dependencies. Learn more about Socket for GitHub.

Diff	Package	Supply Chain Security	Vulnerability	Quality	Maintenance	License
	postcss@​8.5.22 ⏵ 8.5.23		+2

View full report

[greptile-apps]

Greptile Summary

This PR remediates dependency vulnerabilities through focused patch-level development dependency updates while preserving the existing dependency structure.

• Pins PostCSS from 8.5.22 to 8.5.23 in the manifest and lockfile.
• Updates the sole locked js-yaml resolution from 4.3.0 to 4.3.1.
• Leaves the remaining dependency graph unchanged.

Confidence Score: 5/5

The PR appears safe to merge with no actionable defects identified in the focused dependency updates.

The manifest and lockfile consistently apply the intended patch releases, and the diff introduces no conflicting dependency, resolution, build, or runtime behavior.

Important Files Changed

Filename	Overview
package.json	Updates the direct PostCSS development dependency to the intended patched version with no other manifest changes.
package-lock.json	Consistently records the patched PostCSS and js-yaml resolutions without unrelated lockfile churn.

_{Reviews (1): Last reviewed commit: "fix(deps): remediate PROD-5139 vulnerabi..." | Re-trigger Greptile}