fix(container): harden shell terminal keybinds for Docker-attached panes

[AnExiledDev]

Summary

• Disabled problematic terminal signals — Ctrl+Z (suspend, closes Docker-attached panes), Ctrl+S/Q (flow control freeze), Ctrl+W (conflicts with Windows Terminal close-tab)
• Rebound SIGQUIT and EOF — Ctrl+\ → Ctrl+] and Ctrl+D → Ctrl+^ as emergency-only alternatives
• zsh-specific cleanup — conditional bindkey -r to remove zsh line-editor bindings that bypass stty: Ctrl+W (backward-kill-word), Alt+W (copy-region-as-kill), Alt+Q (push-line)

All config lives in the managed block in setup-aliases.sh — idempotent, rewritten on every container start.

Test plan

• Open a terminal in the container (VS Code or docker exec)
• Run stty -a — verify susp = <undef>, werase = <undef>, quit = ^\], eof = ^\^, no ixon
• Press Ctrl+Z — nothing should happen
• Press Ctrl+S — terminal should NOT freeze
• Press Ctrl+W — should NOT delete a word
• Press Alt+W — nothing should happen (zsh)
• Press Alt+Q — nothing should happen (zsh)
• Press Ctrl+^ — sends EOF (in cat, terminates input)
• Press Ctrl+] — sends SIGQUIT (in cat, shows ^\)
• Verify Ctrl+C still works (SIGINT unaffected)

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