Add worktrunk keybindings for worktree management (switch/create/remove),
shell hooks for automatic-rename in bash and fish, and zoxide directory
browsing. Add mise setup task to install all three plugins.
Enable auto theme switching.
Split bash config into dedicated aliases and profile files. Extract
fish shell init from config.fish into composable conf.d fragments
(setup, environment, ssh-auth-sock). Remove the generic profile in
favor of the bash-specific one. Add a static SSH_AUTH_SOCK symlink
so tmux sessions always see the current socket regardless of which
shell spawned them.
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