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, 51 insertions, 0 deletions

diff --git a/tests/test-test-runner--nil-global-directory.el b/tests/test-test-runner--nil-global-directory.el
new file mode 100644
index 00000000..c70de5bd
--- /dev/null
+++ b/tests/test-test-runner--nil-global-directory.el
@@ -0,0 +1,51 @@
+;;; test-test-runner--nil-global-directory.el --- Tests for the no-test-directory path -*- lexical-binding: t -*-
+
+;;; Commentary:
+;; Outside a Projectile project, `cj/test--get-test-directory' falls back
+;; to `cj/test-global-directory', which defaults to nil.  These tests pin
+;; the contract for that nil case: discovery helpers return nil instead
+;; of crashing on (file-directory-p nil), and the interactive commands
+;; signal `user-error' instead of wrong-type-argument.
+
+;;; Code:
+
+(require 'ert)
+(require 'cl-lib)
+
+(add-to-list 'load-path (expand-file-name "modules" user-emacs-directory))
+(require 'test-runner)
+
+(defmacro test-runner-nil-dir--outside-project (&rest body)
+  "Run BODY with no project root and a nil `cj/test-global-directory'."
+  (declare (indent 0))
+  `(let ((cj/test-global-directory nil))
+     (cl-letf (((symbol-function 'cj/test--project-root)
+                (lambda () nil)))
+       ,@body)))
+
+;;; Boundary Cases
+
+(ert-deftest test-test-runner-nil-dir-get-test-directory-returns-nil ()
+  "Boundary: no project and no global dir yields nil, not an error."
+  (test-runner-nil-dir--outside-project
+    (should (null (cj/test--get-test-directory)))))
+
+(ert-deftest test-test-runner-nil-dir-get-test-files-returns-nil ()
+  "Boundary: file discovery returns nil instead of crashing on a nil dir."
+  (test-runner-nil-dir--outside-project
+    (should (null (cj/test--get-test-files)))))
+
+;;; Error Cases
+
+(ert-deftest test-test-runner-nil-dir-load-all-signals-user-error ()
+  "Error: `cj/test-load-all' signals `user-error', not wrong-type-argument."
+  (test-runner-nil-dir--outside-project
+    (should-error (cj/test-load-all) :type 'user-error)))
+
+(ert-deftest test-test-runner-nil-dir-focus-add-signals-user-error ()
+  "Error: `cj/test-focus-add' signals `user-error', not wrong-type-argument."
+  (test-runner-nil-dir--outside-project
+    (should-error (cj/test-focus-add) :type 'user-error)))
+
+(provide 'test-test-runner--nil-global-directory)
+;;; test-test-runner--nil-global-directory.el ends here