dotfiles: initial scaffold for Coder devboxes

install.sh (symlink home/* + merge-seed ~/.claude.json onboarding), gitconfig,
bash_aliases, global gitignore, inputrc, tmux.conf. Golden owns tools+starship;
this owns personal config. Secrets stay in Coder user-secrets.

Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>

home/.bash_aliases

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+# Personal aliases — sourced automatically by Debian's default ~/.bashrc.
+# Golden owns starship/mise/eza/zoxide/fzf setup; these just add shortcuts.
+
+# listing (eza is installed in golden)
+if command -v eza >/dev/null 2>&1; then
+  alias ls='eza --group-directories-first'
+  alias ll='eza -la --group-directories-first --git'
+  alias la='eza -a --group-directories-first'
+  alias lt='eza --tree --level=2'
+fi
+
+# navigation
+alias ..='cd ..'
+alias ...='cd ../..'
+alias ....='cd ../../..'
+
+# git
+alias gs='git status -sb'
+alias gd='git diff'
+alias gds='git diff --staged'
+alias ga='git add'
+alias gc='git commit'
+alias gp='git push'
+alias gl='git log --oneline --graph --decorate -20'
+alias gco='git switch'
+
+# tooling shortcuts (all present in golden)
+alias k='kubectl'
+alias dc='docker compose'
+alias d='docker'
+alias tf='terraform'
+
+# safety
+alias rm='rm -i'
+alias cp='cp -i'
+alias mv='mv -i'