feat(container): zsh completion stack

[AnExiledDev]

Summary

• New devcontainer feature zsh-completions — installs fzf, carapace-bin, zsh-autosuggestions, zsh-syntax-highlighting, and fzf-tab at build time
• setup-terminal.sh expanded to configure .zshrc with full OMZ plugins list and carapace multi-shell bridge (idempotent via marker blocks)
• Tmux default-shell set to /usr/bin/zsh so new panes spawn zsh regardless of entry method
• Carapace installed via GitHub releases .deb with tarball fallback (apt.fury.io GPG key is defunct)

Test plan

• Rebuild devcontainer and verify fzf, carapace, and plugins are installed
• git che<TAB> → shows checkout, cherry-pick, etc.
• docker run --<TAB> → shows flags (via carapace bridge)
• Multiple completions trigger fzf-tab fuzzy-selection UI
• Type a previously-run command → ghost text appears (autosuggestions)
• Valid commands green, invalid red (syntax-highlighting)
• tmux new -s test → pane prompt is zsh
• Rebuild again → .zshrc not duplicated (idempotency)
• echo $SHELL → /usr/bin/zsh

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• Commit unit tests in branch feat/zsh-completions

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