refactor: split eshell-vterm-config into eshell-config and vterm-config

The combined module had grown to 573 lines covering two unrelated subsystems with no shared state — the eshell shell-mode commands and the vterm/F12 toggle. The header even rendered this with two `;; ----` dividers. Split into two focused modules. eshell-config.el keeps the eshell user commands and package wiring (~170 lines). vterm-config.el keeps the vterm package, the tmux history capture command, the F12 toggle, and the C-; V keymap (~400 lines). Update init.el to require both, point the four vterm test files at vterm-config, and refresh the cross-module commentary in cj-window-geometry.el and cj-window-toggle.el.

No behavior change. Full test suite green; validate-modules clean.

0 files changed, 0 insertions, 0 deletions