clean.md

heta clean

Clean generated wiki knowledge while keeping original raw files.

heta clean
heta clean --yes

What it does:

• Clears generated wiki pages.
• Resets wiki/index.md.
• Appends a clean operation to wiki/log.md.
• Deletes the local wiki vector database.
• Keeps ~/.heta/workspace/kb/raw.
• Commits the clean operation to the wiki Git repo.