refactor: consolidate all branches into single-branch Strategy 1

- bash/.bashrc: replace oh-my-bash with minimal unified config
  sources common → aliases → OS overlay → .bashrc.local

- zsh/.zshrc: remove hardcoded macOS PATHs (moved to macos overlay)
  clean sourcing order: common → personal → aliases → OS → .zshrc.local

- shell/common: populated with universal exports (EDITOR, HISTSIZE, etc.)
- shell/macos: Homebrew, Antigravity, Flutter PATH, fzf init, macOS aliases
- shell/linux: xdg-open, xclip, fzf init for Linux

- nvim/plugins/work.lua: Copilot plugin (migrated from origin/work branch)
- nvim/plugins/_init.lua: conditional load via DOTFILES_PROFILE=work env var

- tmux/.tmux.conf.local: per-machine override hook (~/.tmux.conf.machine.local)

- bootstrap.sh: one-command new machine setup with profile support
  usage: bash bootstrap.sh [personal|work]

- .gitignore: comprehensive .local file ignore patterns

All branches (linux, mac, work, linux_personal, linux_work, mac_personal)
can now be deleted — all unique content is merged into master.

bootstrap.sh

@@ -0,0 +1,85 @@
+#!/usr/bin/env bash
+# bootstrap.sh — Set up dotfiles on a new machine
+# Usage: bash bootstrap.sh [--profile personal|work]
+#
+# This script stows all dotfile packages, copies shell config files,
+# and creates untracked .local stub files for per-machine overrides.
+
+set -e
+DOTFILES_DIR="$(cd "$(dirname "${BASH_SOURCE[0]}")" && pwd)"
+PROFILE="${1:-personal}"
+
+echo "━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━"
+echo "  Dotfiles Bootstrap"
+echo "  Profile : $PROFILE"
+echo "  OS      : $(uname -s)"
+echo "  Host    : $(hostname)"
+echo "━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━"
+
+# ── 1. Stow all packages ───────────────────────────────────────────────────────
+# shell is excluded from global .stow-local-ignore, handled separately below
+PACKAGES="zsh bash tmux nvim starship alacritty kitty ghostty wezterm zed btop vim"
+
+for pkg in $PACKAGES; do
+  if [[ -d "$DOTFILES_DIR/$pkg" ]]; then
+    echo "  stow → $pkg"
+    stow --adopt --dir="$DOTFILES_DIR" --target="$HOME" "$pkg" 2>/dev/null || \
+      echo "  ⚠ stow $pkg skipped (already linked or conflict)"
+  fi
+done
+
+# ── 2. Copy shell config files manually (stow-local-ignore excludes `shell`) ──
+SHELL_SRC="$DOTFILES_DIR/shell/.config/shell"
+SHELL_DST="$HOME/.config/shell"
+mkdir -p "$SHELL_DST"
+
+for f in common aliases personal work macos linux; do
+  if [[ -f "$SHELL_SRC/$f" ]]; then
+    echo "  copy shell/$f → $SHELL_DST/$f"
+    cp -n "$SHELL_SRC/$f" "$SHELL_DST/$f" 2>/dev/null || true
+  fi
+done
+
+# ── 3. Create untracked .local stub files ─────────────────────────────────────
+create_stub() {
+  local file="$1" comment="$2"
+  if [[ ! -f "$file" ]]; then
+    echo "# $comment" > "$file"
+    echo "  created stub → $file"
+  else
+    echo "  exists (skipped) → $file"
+  fi
+}
+
+create_stub "$HOME/.zshrc.local"            "Per-machine zsh overrides — never committed"
+create_stub "$HOME/.bashrc.local"           "Per-machine bash overrides — never committed"
+create_stub "$HOME/.tmux.conf.machine.local" "Per-machine tmux overrides — never committed"
+create_stub "$HOME/.gitconfig.local"        "Per-machine git identity — never committed"
+
+# ── 4. Inject profile into .zshrc.local if requested ──────────────────────────
+if [[ "$PROFILE" == "work" ]]; then
+  if ! grep -q "DOTFILES_PROFILE" "$HOME/.zshrc.local" 2>/dev/null; then
+    echo "" >> "$HOME/.zshrc.local"
+    echo "# Work profile — load work-specific shell config and nvim plugins" >> "$HOME/.zshrc.local"
+    echo "export DOTFILES_PROFILE=work" >> "$HOME/.zshrc.local"
+    echo "source ~/.config/shell/work" >> "$HOME/.zshrc.local"
+    echo "  → injected DOTFILES_PROFILE=work into ~/.zshrc.local"
+  fi
+fi
+
+# ── 5. macOS-specific setup ───────────────────────────────────────────────────
+if [[ "$(uname -s)" == "Darwin" ]]; then
+  # Install Homebrew if missing
+  if ! command -v brew >/dev/null 2>&1; then
+    echo "  Installing Homebrew…"
+    /bin/bash -c "$(curl -fsSL https://raw.githubusercontent.com/Homebrew/install/HEAD/install.sh)"
+  fi
+fi
+
+echo ""
+echo "━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━"
+echo "  Done! Next steps:"
+echo "  1. Edit ~/.zshrc.local  — add secrets / tokens"
+echo "  2. Edit ~/.gitconfig.local — add your git identity for this machine"
+echo "  3. Run: exec zsh  (or source ~/.bashrc for bash)"
+echo "━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━"