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Adds help.html to the repo root, resolving the 404 at /help for users accessing the Nexus web app. The page documents navigation controls, keyboard bindings, Timmy chat commands, portal status indicators, and HUD panel descriptions, using the existing dark-space/holographic design system (Orbitron + JetBrains Mono, teal/purple palette). Also adds tests/test_help_page.py to verify the page exists and covers required sections. Fixes #833 Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>