fix(dev): repair hunk jump, F4 hook leak, async clone, and nil guards

- vc-config: C-; v d matched literal +/- source text via consult-line, not gutter hunks. It now completes over git-gutter's hunk list and jumps to the chosen line.
- vc-config: clipboard clone ran git synchronously, freezing every frame for the whole clone. It now runs async with a sentinel that opens the clone on success and surfaces the process buffer on failure.
- vc-config: magit-blame bound D and S to the same command. D is now difftastic-magit-diff, matching the transient.
- vc-config: dropped the :commands autoload for git-timemachine-show-selected-revision, a function the package never defined. The phantom appeared in M-x and errored.
- dev-fkeys: both F4 chained-compile handlers armed a hook on the global compilation-finish-functions before their compile ran, so a quit left it live and the next unrelated compile fired the chain. The one-shot hook now installs buffer-locally in the compilation buffer, same shape as the projectile cache-revert hooks.
- test-runner: outside a project with no global test directory, three commands crashed with wrong-type-argument on a nil path. Discovery now returns nil and the commands signal user-error.
- diff-config: removed the global "-w" ediff default, which made every session ignore whitespace (indentation-only changes compared as identical). Whitespace-ignore stays available as ediff's per-session toggle.
- restclient-config: the C-; R bindings went through raw global-set-key, silently depending on keybindings.el loading first. They now use a prefix keymap registered like the other C-; prefixes.
- httpd-config: simple-httpd loaded on a 1s timer and created www/ on every startup. It now defers until impatient-mode needs it, and the doc root is created at package load.

1 files changed, 9 insertions, 4 deletions

diff --git a/modules/restclient-config.el b/modules/restclient-config.el
index 0511eddb..497f54d0 100644
--- a/modules/restclient-config.el
+++ b/modules/restclient-config.el
@@ -8,7 +8,7 @@
 ;; Load shape: eager.
 ;; Eager reason: none; API exploration, a command-loaded deferral candidate.
 ;; Top-level side effects: package configuration via use-package.
-;; Runtime requires: none (configures packages via use-package).
+;; Runtime requires: keybindings (C-; R prefix registration).
 ;; Direct test load: yes.
 ;;
 ;; Integrates restclient.el for interactive API exploration from within Emacs.
@@ -23,6 +23,8 @@
 
 ;;; Code:
 
+(require 'keybindings)  ;; cj/register-prefix-map
+
 ;; --------------------------------- Constants ---------------------------------
 
 (defvar cj/restclient-data-dir (expand-file-name "data/" user-emacs-directory)
@@ -61,12 +63,15 @@
 
 ;; -------------------------------- Keybindings --------------------------------
 
-(global-set-key (kbd "C-; R n") #'cj/restclient-new-buffer)
-(global-set-key (kbd "C-; R o") #'cj/restclient-open-file)
+(defvar-keymap cj/restclient-map
+  :doc "Keymap for restclient operations"
+  "n" #'cj/restclient-new-buffer
+  "o" #'cj/restclient-open-file)
+
+(cj/register-prefix-map "R" cj/restclient-map "REST client")
 
 (with-eval-after-load 'which-key
   (which-key-add-key-based-replacements
-    "C-; R" "REST client"
     "C-; R n" "new scratch buffer"
     "C-; R o" "open .rest file"))