feat(scripts): add worktree-create hook script

- creates a git worktree under .git/worktrees/<name>
- branches off origin/HEAD with the worktree name
- pushes branch to remote with tracking
- prints worktree path to stdout for claude code hook consumption

Author: dgokcin

ai-stuff/claude/scripts/worktree-create.sh

@@ -0,0 +1,24 @@
+#!/bin/bash
+set -e
+
+# Read JSON from stdin
+INPUT=$(cat)
+
+# Parse fields from Claude Code hook input
+BASE_PATH=$(echo "$INPUT" | jq -r '.cwd')
+WORKTREE_NAME=$(echo "$INPUT" | jq -r '.name')
+
+# Worktree lives under .git/worktrees/<name>
+WORKTREE_PATH="$BASE_PATH/.git/worktrees/$WORKTREE_NAME"
+
+cd "$BASE_PATH"
+
+# Create worktree — branch name matches worktree name (no prefix)
+git worktree add "$WORKTREE_PATH" -b "$WORKTREE_NAME" origin/HEAD
+
+# Push branch to remote with tracking
+git -C "$WORKTREE_PATH" push -u origin "$WORKTREE_NAME"
+
+# Required: print the worktree path to stdout
+echo "$WORKTREE_PATH"
+exit 0