CR: OpenCode Config Hardening — Rollback

Rollback Plan

# Revert all opencode changes in dots-quantum
git -C ~/atelier/_projects/personal/dots-quantum checkout opencode.json
git -C ~/atelier/_projects/personal/dots-quantum checkout opencode/.config/opencode/opencode.jsonc
git -C ~/atelier/_projects/personal/dots-quantum checkout opencode/.config/opencode/agents/doc-auditor.md
git -C ~/atelier/_projects/personal/dots-quantum checkout opencode/README.adoc

# Re-stow
stow -R -t ~ opencode