Function MapHyperFramesCheckOutput

Maps hyperframes check --json output into CheckIssue[] (VS-RND-5 Step 7):

• layout.findings → Layout
• contrast.findings → Contrast
• motion.findings → Lint
• severity === 'error' → 'Error', anything else → 'Warning'
• {"ok":false,"error":"..."} → one MJ_CHECK_CLI_FAILED Warning with that error message
• Unparseable output → one MJ_CHECK_CLI_UNREADABLE Warning with the reason.