Severe Memory Leaks and Extreme RAM Consumption in Next.js Development Server and Turbopack

Multiple core issues report critical memory leaks, extreme heap growth, and process crashes when running Next.js in development mode (`next dev`) and during builds (`next build`) with Turbopack. Issues include linear heap retention on every App Router render due to async-hooks promise tracking in the dev runtime, massive RAM spikes when compiling route handlers after pages, and cache persistence performance regressions.

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