fix(doom): pin org-msg to fix build after upstream force-push

The org-msg commit pinned by doom-emacs was force-pushed away.
Pin it locally to a valid commit on main branch.

Also updates nix-doom-emacs-unstraightened input.

Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>

home/roles/emacs/doom/packages.el

@@ -51,6 +51,9 @@
 
 (package! org-caldav)
 
+;; Pin org-msg - upstream doom pin references a force-pushed commit
+(package! org-msg :pin "aa608b399586fb771ad37045a837f8286a0b6124")
+
 ;; Note: Packages with custom recipes must be pinned for nix-doom-emacs-unstraightened
 ;; to build deterministically. Update pins when upgrading packages.