docs: add zerolag demo video to README

Side-by-side comparison of local echo (0ms) vs server echo (600ms-2.7s)
rendered from Remotion ZerolagDemo composition.

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>
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arkon
2026-03-07 07:43:52 +01:00
co-authored by Claude Opus 4.6
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@@ -143,6 +143,10 @@ Watch background agents work in real-time. Codeman monitors agent activity and d
## Zero-Lag Input Overlay
<p align="center">
<img src="docs/images/zerolag-demo.gif" alt="Zerolag Demo — local echo vs server echo side-by-side" width="900">
</p>
When accessing your coding agent remotely (VPN, Tailscale, SSH tunnel), every keystroke normally takes 200-300ms to round-trip. Codeman implements a **Mosh-inspired local echo system** that makes typing feel instant regardless of latency.
A pixel-perfect DOM overlay inside xterm.js renders keystrokes at 0ms. Background forwarding silently sends every character to the PTY in 50ms debounced batches, so Tab completion, `Ctrl+R` history search, and all shell features work normally. When the server echo arrives 200-300ms later, the overlay seamlessly disappears and the real terminal text takes over — the transition is invisible.
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