Previous `VAR=val cmd` format only applied to first command in chains.
New `export VAR=val; cmd` format ensures variables persist for all commands.
Also increased test timeouts for todo-continuation-enforcer stability.
🤖 GENERATED WITH ASSISTANCE OF [OhMyOpenCode](https://github.com/code-yeongyu/oh-my-opencode)
OpenCode's bash tool ignores args.env and uses hardcoded process.env in spawn().
Work around this by prepending GIT_EDITOR, EDITOR, VISUAL, and PAGER env vars
directly to the command string. Only applies to git commands to avoid bloating
non-git commands.
Added shellEscape() and buildEnvPrefix() helper functions to properly escape
env var values and construct the prefix string.
🤖 GENERATED WITH ASSISTANCE OF [OhMyOpenCode](https://github.com/code-yeongyu/oh-my-opencode)
YeonGyu-Kim