zsh: add zoxide/bat/delta, starship prompt config, extra history options; rewrite README

Bootstrap (zshrc-bootstrap.zsh):
- Add bat and zoxide to the cross-distro install loop
- Add git-delta install block (package is 'git-delta' on every PM but
  binary is 'delta', mirroring the starship/lazydocker pattern)
- Debian/Ubuntu compat: symlink batcat->bat and fdfind->fd into
  ~/.local/bin so zshrc integrations work under both names
- Bump ZSHRC_BOOTSTRAP_VERSION 2 -> 3 so existing machines re-run the
  bootstrap and auto-install the new tools

zshrc:
- Add setopts HIST_VERIFY, EXTENDED_HISTORY, AUTO_PUSHD,
  PUSHD_IGNORE_DUPS, PUSHD_SILENT
- Self-configuring tool integrations (all behind command -v guards):
  - zoxide: eval $(zoxide init zsh) for frecent 'z'/'zi' dir jumping
  - bat: alias cat->bat, BAT_THEME, colored MANPAGER via bat
  - delta: GIT_PAGER=delta for prettier git diff/log/show
- Extend the interactive auto-update block to also sync starship.toml
  to ~/.config/starship.toml (overwrite-if-changed, validated the
  same way as zshrc); keep the reproducible/self-configuring design
- Inverted hyperlink fix already landed in prior commit; no change
  here

starship.toml (new):
- Two-line prompt: directory + git status + cmd duration on line 1,
  arrow (red on error) on line 2; Nerd Font symbols, SSH host/user,
  Python/Node/Rust/Go/Java/Docker context blocks
- Validated clean with starship 1.21.1 (uses [nodejs], not [node])

README.md:
- Full rewrite: documents the design philosophy, all files, deps,
  integrations, history options, aliases, keybindings, the eza
  hyperlink workaround rationale, auto-update behavior, per-machine
  overrides, env vars, and helper functions

zsh/zshrc-bootstrap.zsh

@@ -7,7 +7,7 @@ mkdir -p "$HOME/.local/bin"
 mkdir -p "$ZSH_CONFIG"
 path+=("$HOME/.local/bin")
 
-for p in git starship fzf eza rsync lazydocker fastfetch tmux; do
+for p in git starship fzf eza rsync lazydocker fastfetch tmux bat zoxide; do
   command -v $p >/dev/null && continue
   if command -v brew >/dev/null; then
     echo "Installing $p using brew" && brew install $p && continue
@@ -37,6 +37,32 @@ if ! command -v lazydocker >/dev/null; then
   DIR=$HOME/.local/bin bash >/dev/null 2>&1
 fi
 
+# Debian/Ubuntu ships bat as 'batcat' and fd as 'fdfind'; symlink to the
+# canonical names so the zshrc integrations (which call bat/fd) work everywhere.
+if ! command -v bat >/dev/null && command -v batcat >/dev/null; then
+  ln -sf "$(command -v batcat)" "$HOME/.local/bin/bat"
+fi
+if ! command -v fd >/dev/null && command -v fdfind >/dev/null; then
+  ln -sf "$(command -v fdfind)" "$HOME/.local/bin/fd"
+fi
+
+# git-delta: the package is named 'git-delta' on every package manager but the
+# binary is 'delta' (name mismatch vs the install loop above), so install via the
+# same PM cascade using the real package name. Used by zshrc as GIT_PAGER.
+if ! command -v delta >/dev/null; then
+  if command -v brew >/dev/null; then
+    echo "Installing git-delta using brew" && brew install git-delta
+  elif command -v apt >/dev/null && apt-cache show git-delta >/dev/null 2>&1; then
+    echo "Installing git-delta using Apt" && sudo apt install git-delta -y
+  elif command -v dnf >/dev/null && dnf list available git-delta >/dev/null 2>&1; then
+    echo "Installing git-delta using dnf" && sudo dnf install git-delta -y
+  elif command -v pacman >/dev/null && pacman -Si git-delta >/dev/null 2>&1; then
+    echo "Installing git-delta using pacman" && sudo pacman -Sy --noconfirm git-delta
+  elif command -v cargo >/dev/null; then
+    echo "Installing git-delta using cargo" && cargo install git-delta --locked
+  fi
+fi
+
 arch=$(uname -m)
 case "$arch" in
   x86_64)       target_fast="linux-amd64" && target_eza="x86_64-unknown-linux-gnu" ;;