refactor: rename debug-wttrin-* commands to wttrin-debug-* with obsolete aliases

The four interactive commands in `wttrin-debug.el` used `debug-wttrin-` as their prefix instead of the package's `wttrin-debug-` prefix. package-lint flags this as a convention violation, and it makes M-x discovery slightly less consistent for users.

Renamed:
- `debug-wttrin-show-raw`   -> `wttrin-debug-show-raw`
- `debug-wttrin-enable`     -> `wttrin-debug-enable`
- `debug-wttrin-disable`    -> `wttrin-debug-disable`
- `debug-wttrin-mode-line`  -> `wttrin-debug-mode-line`

The old names stay available as `define-obsolete-function-alias` entries marked since 0.4.0, so anyone with a keybinding or `(call-interactively 'debug-wttrin-enable)` in their config keeps working. The byte-compiler will emit an obsolescence warning to nudge migration. Aliases will be removed in a future release.

Internal caller `wttrin--debug-mode-line-info` now invokes the new name. Test files renamed to match (`test-debug-wttrin-*.el` -> `test-wttrin-debug-*.el`); inside each, ert-deftest names and function calls were updated.

Added `tests/test-wttrin-debug-aliases.el` to verify each old name resolves via `indirect-function` to the new name and carries `byte-obsolete-info` with the expected target and "0.4.0" version.

1 files changed, 52 insertions, 0 deletions

diff --git a/tests/test-wttrin-debug-aliases.el b/tests/test-wttrin-debug-aliases.el
new file mode 100644
index 0000000..1e2194b
--- /dev/null
+++ b/tests/test-wttrin-debug-aliases.el
@@ -0,0 +1,52 @@
+;;; test-wttrin-debug-aliases.el --- Tests for obsolete debug aliases -*- lexical-binding: t; -*-
+
+;; Copyright (C) 2026 Craig Jennings
+
+;;; Commentary:
+
+;; The four `debug-wttrin-*' names were renamed to `wttrin-debug-*' in
+;; 0.4.0 to follow the package-prefix convention.  The old names remain
+;; as obsolete aliases so existing keybindings keep working.  These tests
+;; verify each alias resolves to the new function and is marked obsolete
+;; with the expected target and version.
+
+;;; Code:
+
+(require 'ert)
+(require 'wttrin)
+(require 'testutil-wttrin)
+
+(require 'wttrin-debug
+         (expand-file-name "wttrin-debug.el"
+                           (file-name-directory (locate-library "wttrin"))))
+
+(defconst test-wttrin-debug-aliases-pairs
+  '((debug-wttrin-show-raw   . wttrin-debug-show-raw)
+    (debug-wttrin-enable     . wttrin-debug-enable)
+    (debug-wttrin-disable    . wttrin-debug-disable)
+    (debug-wttrin-mode-line  . wttrin-debug-mode-line))
+  "Old-name to new-name pairs for the renamed debug functions.")
+
+;;; Normal Cases
+
+(ert-deftest test-wttrin-debug-aliases-normal-each-old-name-resolves-to-new ()
+  "Every old name is fboundp and indirects to its new name."
+  (dolist (pair test-wttrin-debug-aliases-pairs)
+    (let ((old (car pair))
+          (new (cdr pair)))
+      (should (fboundp old))
+      (should (eq (indirect-function old) (symbol-function new))))))
+
+(ert-deftest test-wttrin-debug-aliases-normal-each-old-name-marked-obsolete ()
+  "Every old name has byte-obsolete-info pointing at the new name and 0.4.0."
+  (dolist (pair test-wttrin-debug-aliases-pairs)
+    (let* ((old (car pair))
+           (new (cdr pair))
+           (info (get old 'byte-obsolete-info)))
+      (should info)
+      ;; byte-obsolete-info is (CURRENT-NAME HANDLER WHEN)
+      (should (eq new (car info)))
+      (should (string= "0.4.0" (nth 2 info))))))
+
+(provide 'test-wttrin-debug-aliases)
+;;; test-wttrin-debug-aliases.el ends here