Copy-paste broken inside Claude Code sessions (missing OSC 52 support)

[datasciencemonkey]

Problem

Copy-paste does not work inside Claude Code sessions on the terminal. Regular bash sessions work fine.

Claude Code uses OSC 52 escape sequences for clipboard operations. The xterm.js ClipboardAddon was never loaded, so OSC 52 sequences are silently ignored. The status bar shows "sent 516 chars via OSC 52 · check terminal clipboard settings if paste fails".

Fix

Add @xterm/addon-clipboard to handle OSC 52 read/write sequences.

Fixed in #119.