Problem: icon customization and auto-start workflow are undocumented;
no demo asset exists for the README.
Solution: document pending.Icons in vimdoc with nerd font and ASCII
recipes, add PendingTab to commands and mappings, add open-on-startup
recipe, add demo-init.lua and demo.tape for VHS screenshot generation,
add assets/ directory, add README icons section and demo placeholder.
Problem: repo had no documentation for users.
Solution: add README covering usage, configuration, inline
metadata syntax, Google Calendar sync, mappings, and data
format.
