fix: remove SetEnv TERM=xterm-256color from ssh/config Host *

[stanfish06]

Closes #54\n\n## Problem\n\nCommit af605023 ("fix ssh term") re-added SetEnv TERM=xterm-256color to Host * on the same branch as PR #50, undoing the intentional removal in 57482bc. PR #53 (Copilot draft) attempted to remove it again but was closed without merging.\n\n## Why it must go\n\n- Conflicts with tmux-256color — inside tmux TERM is tmux-256color (PRs #16 #22 #34 #48). Forcing xterm-256color over SSH overwrites this on the remote side, breaking true-color in neovim.\n- Silently no-ops on HPC — greatlakes/bridges2 do not set AcceptEnv TERM in sshd_config, so the directive is already ignored there.\n- Was intentionally deleted — 57482bc in PR #50 removed this exact line.\n\n## Change\n\nOne-line deletion from Host * in ssh/config:\n\ndiff\n Host *\n ControlMaster auto\n- SetEnv TERM=xterm-256color\n ControlPath ~/.ssh/controlmasters/%r@%h:%p\n ControlPersist 1800\n Compression yes\n TCPKeepAlive yes\n ServerAliveInterval 20\n ServerAliveCountMax 10\n\n\n## Test plan\n- [ ] grep SetEnv ssh/config — no matches\n- [ ] SSH to any host — TERM inherits from the local terminal as expected

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