fix(shell): require external-open, scope tramp revert, drop dead configHEADmain

- dirvish-config, dwim-shell-config: both call cj/xdg-open (external-open) but relied on init.el requiring it before them, and dirvish's require comment misattributed it to system-utils. Added the require to both and corrected the comment and both Runtime-requires headers.
- tramp-config: revert-without-query was set to '(".*") inside the TRAMP module, so every file in Emacs reverted without confirmation. Scoped it to the TRAMP path regexp, so local files keep their revert prompt and remote files skip the round-trip.
- tramp-config: removed the sshfast method (referenced nowhere, scp and sshx handle everything) and a duplicate tramp-own-remote-path add-to-list.

Tests: new runtime-requires assertions for both modules, red first under make test-file. The tramp :config edits are verified in the daemon. Suite green.

0 files changed, 0 insertions, 0 deletions