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Miguel Ángel
a54953b936
The preview command's shutdown handler only closed the HTTP server, leaving Chrome (browser pool) and ffmpeg processes alive. This caused silent resource leaks — orphaned processes consuming CPU and RAM with no parent. Root cause: preview.ts never called drainBrowserPool() or killed tracked ffmpeg processes. The thumbnail browser in studioServer.ts registered its own competing signal handlers that raced with preview's shutdown. Fix: - Add a central process tracker (processTracker.ts) that registers every spawned ffmpeg across engine and producer packages - Centralize thumbnail browser cleanup via exported closeThumbnailBrowser() instead of scattered signal handlers - Wire preview shutdown to call closeThumbnailBrowser(), drainBrowserPool(), and killTrackedProcesses() before closing the HTTP server (embedded mode) - Add killProcessTree() for dev/local modes where Chrome runs in a child process tree - Add startup orphan detection that finds and kills orphaned chrome-headless-shell/Puppeteer Chrome processes (PPID=1) from previously crashed sessions Closes #1038