- index.ts: add _storesInitialized guard to prevent triple initialization
- offlineStore.ts: add isRetrying mutex for retryAllMessages concurrency
- PropertyPanel.tsx: replace 13x (data as any) with typed d accessor
- chatStore.ts: replace window as any with Record<string, unknown>
- kernel-*.ts: replace prototype as any with Record<string, unknown>
- gateway-heartbeat.ts: delete dead code (9 as any, zero imports)
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