feature: Ghostty and Emacs polish in dotfiles

I published My AI-Assisted Terminal Setup: Subspace Emacs and a Tmux Layout Shortcut, the fuller write-up that ties together the tmux 70/20/10 layout and the move off Spacemacs into Subspace Emacs. It covers how Claude and Codex split the work between research and implementation, the tmux-as-TDD-harness approach that unblocked the layout binding, and the tmux/tmux#1839 discovery that finally let swap-pane preserve zoom state. This supersedes the two narrower notes from earlier today.

I published Building a Lightweight Emacs Config After Spacemacs, the fuller write-up I promised when I shipped the dotfiles update earlier today. It walks through why I left Spacemacs, what I kept (Evil, leader keys, Magit, Helm-style tracked file finding, early theme loading), and how the new ~/.emacs.d is organized as a small set of explicit modules instead of a framework.

I shipped v2026.5.1 of dotfiles, which pairs a nicer tmux workflow with the move away from the old Spacemacs setup into a smaller hand-rolled Emacs config. The tmux side gives me a one-keystroke 70/20/10 vertical layout plus a safe top-and-middle pane swap, while PR #2 keeps the core editor ergonomics I care about like Evil, leader keys, Magit, Helm-style tracked file finding, and early theme loading without the extra framework machinery. This is the point where the repo feels easier to understand and own, and I want to do a fuller write-up on the tmux and "Subspacemacs" workflow soon.