rename pm project wt create/delete to add/remove
Clean rename, no back-compat aliases. Updates every integration:
zsh completion (regenerated _pm; also fixes the stale --repo
substitution that had lost _pm_repos completion), the pm-workflow
Claude Code skill (plugin bumped to 0.1.1), and the Emacs package
(pm-wt-add/pm-wt-remove function chain, prompts, and transient).