feat: add git worktree management utilities for Fish and Bash

Add comprehensive worktree tooling with FZF integration:
- wtb: create branch worktree with gitignored file cloning
- wtcd/wtr: interactive picker and multi-remove with FZF
- wtf/wth: feature/hotfix branch shortcuts
- wts/wtl: status overview and listing
- Automatic .worktrees/ organization and .gitignore management

home/dot_config/fish/functions/wtb.fish

@@ -0,0 +1,54 @@
+function wtb --description "Add git worktree with new branch"
+    if test (count $argv) -lt 1
+        echo "Usage: wtb <branch-name> [base-ref]" >&2
+        return 1
+    end
+
+    set -l root (git rev-parse --show-toplevel 2>/dev/null)
+    if test -z "$root"
+        echo "Not in a git repository" >&2
+        return 1
+    end
+
+    set -l branch $argv[1]
+    
+    # Get base ref: argument, or current branch tip
+    set -l base
+    if test (count $argv) -ge 2
+        set base $argv[2]
+    else
+        # Get current branch name (not HEAD if detached)
+        set base (git symbolic-ref --short HEAD 2>/dev/null)
+        if test -z "$base"
+            set base (git rev-parse HEAD)
+        end
+    end
+
+    # Sanitize branch name for directory (replace / with -)
+    set -l dir_name (string replace --all '/' '-' "$branch")
+    set -l wt_path "$root/.worktrees/$dir_name"
+
+    # Create .worktrees directory if needed
+    mkdir -p "$root/.worktrees"
+
+    # Add to .gitignore if not already there
+    if not grep -q '^\.worktrees/?$' "$root/.gitignore" 2>/dev/null
+        echo ".worktrees/" >> "$root/.gitignore"
+        echo "Added .worktrees/ to .gitignore"
+    end
+
+    echo "Creating worktree at $wt_path"
+    echo "  Branch: $branch"
+    echo "  Base: $base"
+    
+    if git worktree add -b "$branch" "$wt_path" "$base"
+        echo ""
+        echo "Worktree created: $wt_path"
+        
+        # Clone gitignored files from current worktree
+        set -l current_wt (pwd)
+        _wt_clone_ignored "$current_wt" "$wt_path"
+        
+        cd "$wt_path"
+    end
+end