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Implements the architecture change from ai_prompts/prompt3.md: - New app/click-frames.js: shared timestamped frame ring + strict click-to-frame pairing (never a frame whose grab started after the click); legacy slack behavior kept behind capture.strictClickFrames=false. - New stream capture backend (app/stream-backend.js + hidden worker window): per-display desktop media streams sampled into ring buffers and PNG-encoded entirely off the main process, so click delivery is never starved by capture work. Auto-degrades to the legacy in-process frame loop when streams cannot start or the worker stops answering. - Clicks are paired with their frame at event time (eager pairing in enqueueClickCapture); only the storing is serialized, so slow encodes cannot skew later clicks in a fast burst. - Linux watcher: restored event-time root coordinates from xinput test-xi2 and merge raw/regular twin events structurally. - Replaced the 40ms time debounce with source-aware duplicate suppression: fast legitimate clicks are never dropped. - New app/coords.js: physical-to-DIP conversion with multi-monitor and scale-factor handling; Windows keeps screenToDipPoint. - STEPFORGE_CLICK_SELFTEST end-to-end hook: 3/3 clicks become steps via the stream backend with 0.00% marker offset on this host. - Tests rewritten/added: strict selection, coords, stream backend, Linux coordinate parsing, twin merge, burst clicking (126 passing). Co-Authored-By: Claude Fable 5 <noreply@anthropic.com>