Switch agent job image to Fedora with QoL CLI tooling + neutral shell defaults

- Base fedora:41; reinstall toolchain (node 22, gcc/c++, neovim, tmux, git, etc.)
- Add QoL CLI from the user's Panama setup, all in default Fedora repos: zoxide,
  eza, bat, fzf, fd, gh, gum, ripgrep, bash-completion; oh-my-posh via installer;
  pnpm/yarn/bun via npm; keep codex@0.142.0 + opencode@1.17.9 pinned
- Ship neutral system-wide defaults that work even with an empty/mounted HOME:
  /etc/profile.d/spoon.sh (zoxide/eza/fzf/oh-my-posh init + aliases),
  /etc/tmux.conf (login-shell panes), /etc/spoon/omp.json (default prompt theme)
- .dockerignore: re-include docker/agent-job-rootfs into the build context
- Verified: codex runs a real turn on Fedora (exit 0); all tools present

docker/agent-job-rootfs/etc/profile.d/spoon.sh

@@ -0,0 +1,40 @@
+# Spoon container — neutral interactive shell defaults (system-wide).
+# Tools here benefit everyone; a user's ~/.bashrc (loaded via ~/.bash_profile,
+# which the worker ensures) layers on top and can override any of this.
+
+# Interactive shells only.
+case $- in
+  *i*) ;;
+  *) return ;;
+esac
+
+export EDITOR="${EDITOR:-nvim}"
+export PAGER="${PAGER:-less}"
+# User-local + bun install locations.
+export PATH="$HOME/.local/bin:$HOME/.bun/bin:$PATH"
+
+if command -v zoxide >/dev/null 2>&1; then
+  eval "$(zoxide init bash)"
+fi
+
+if command -v eza >/dev/null 2>&1; then
+  alias ls='eza --group-directories-first --icons'
+  alias ll='eza -lh --group-directories-first --icons --git'
+  alias la='eza -lha --group-directories-first --icons --git'
+  alias lt='eza --tree --level=2 --icons --git'
+fi
+
+command -v bat >/dev/null 2>&1 && alias cat='bat --paging=never --style=plain'
+alias n='nvim'
+alias g='git'
+alias cl='clear'
+
+# fzf keybindings + completion when present.
+for f in /usr/share/fzf/shell/key-bindings.bash \
+  /usr/share/bash-completion/completions/fzf; do
+  [ -f "$f" ] && . "$f"
+done
+
+if command -v oh-my-posh >/dev/null 2>&1 && [ -f /etc/spoon/omp.json ]; then
+  eval "$(oh-my-posh init bash --config /etc/spoon/omp.json)"
+fi