zsh: stop overriding TERM from the shell rc

[presto8]

Hard-coding TERM=xterm-256color in .zshrc clobbers whatever the
terminal emulator and multiplexer set: kitty exports xterm-kitty and
tmux exports tmux-256color. Overriding both defeats the purpose of
install_kitty_terminfo ("install kitty terminfo so tmux and vim work
correctly") and costs true-colour and undercurl detection in neovim,
which sets termguicolors in init.lua.

TERM is the terminal's responsibility, not the shell's.

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[Copilot]

🟢 Approval recommended

The change cleanly removes a problematic environment override and the added comment accurately documents the intended behavior without introducing functional risk.

Pull request overview

Stops prestobuntu.zsh from clobbering the terminal-provided TERM value, which can interfere with correct terminfo selection in terminal emulators (e.g., kitty) and multiplexers (e.g., tmux), and degrade capability detection in terminal apps.

Changes:

• Remove export TERM=xterm-256color from the zsh RC snippet.
• Add an in-file note explaining why TERM should not be set from the shell rc and pointing to install_kitty_terminfo in setup.

File summaries

File	Description
prestobuntu.zsh	Removes hard-coded TERM and documents rationale to rely on terminal/tmux-provided TERM.

Review details

• Files reviewed: 1/1 changed files
• Comments generated: 0
• Review effort level: Lite

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