fix: update ajv from 6.12.6 to 8.18.0 - high severity vulnerability fix

[justinchung-cb]

Description

Resolves a HIGH severity vulnerability flagged by Vulnerability Management for pkg:npm/ajv@6.12.6 in c3/onchain-test-kit.

• Fix By Date: 2026-03-04
• Recommended Version: 8.18.0
• ajv@6.12.6 was a transitive dependency pulled in by eslint@8 via @eslint/eslintrc in the example/frontend workspace
• Adds "ajv": "^8.18.0" to the root resolutions field in package.json to force the secure version across all workspaces

Fixes OTK-48

Type of Change

• Chore (e.g., refactoring, build improvements, tooling, dependency updates)

Checklist

• I have read the CONTRIBUTING.md document.
• My code follows the style guidelines of this project (e.g., yarn lint, yarn format).
• I have performed a self-review of my code.
• I have updated documentation to reflect my changes (if applicable).
• I have added tests for my changes (if applicable, and new/existing tests pass).
• All commits in this PR are signed.

[linear]

OTK-48 Update ajv from 6.12.6 to 8.18.0 - High Severity Vulnerability Fix

[cb-heimdall]

✅ Heimdall Review Status

Requirement	Status	More Info
Reviews	✅ 1/1	Denominator calculation Show calculation 1 if user is bot 0 1 if user is external 0 2 if repo is sensitive 0 From .codeflow.yml 1 Additional review requirements Show calculation Max 0 0 From CODEOWNERS 0 Global minimum 0 Max 1 1 1 if commit is unverified 0 Sum 1