/paste — Clean content for any destination

Cleans terminal output (ANSI, box-drawing, prompt artifacts, etc.) and reformats per destination rules. Reads clipboard by default, writes back to clipboard + previews in chat.

Step 1 — Get the content

In order:

If the user included content in the prompt (pasted, or referenced from earlier in the conversation), use that.
Else, read the clipboard (commands below).
If both empty, ask the user what to paste.

Clipboard commands by platform (read / write):

Platform	Read	Write
macOS	`pbpaste`	`pbcopy < "$f"`
Linux (Wayland)	`wl-paste -n`	`wl-copy < "$f"`
Linux (X11)	`xclip -selection clipboard -o`	`xclip -selection clipboard < "$f"`
Windows	`powershell Get-Clipboard -Raw`	`powershell "Get-Content -Raw '$f' \| Set-Clipboard"`