Document the fork's architecture and dev/verify workflow for future work
(no test framework; verify via pure-logic functions and generated
command_var). Extend .gitignore to exclude .claude/ local config
(machine-specific paths + personal permission allowlists), common secret
file patterns, and editor/OS junk, while keeping the shipped base_*.mpg
package data tracked.
Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>
