Opencode under Windows/NTFS doesn't have the ce:* commands

[Llorx]

Just pasting what AI told me:

Under Windows, colon should not be used.

[mvanhorn]

I've submitted a fix for this in PR #251. Split colon-separated command names into nested directories (e.g. ce:plan -> ce/plan.md) across the opencode, droid, and gemini targets, matching the approach already used by Qwen.