docs(load-graph): classify core libraries and command modules

Third classification batch: the remaining core and library command modules from init.el's early block — external-open, media-utils, auth-config, keyboard-macros, system-utils, text-config, undead-buffers. I annotated each with the load-graph header contract, added a Batch 3 table to the inventory, and extended the validation allowlist. 23 of 102 modules are now classified.

No new hidden dependencies in this batch. auth-config stays eager because other modules need credentials early; the command libraries (external-open, media-utils, keyboard-macros) are eager only by init order and flagged as Phase 4 deferral candidates.

1 files changed, 10 insertions, 0 deletions

diff --git a/modules/undead-buffers.el b/modules/undead-buffers.el
index c85bde94..fe43575e 100644
--- a/modules/undead-buffers.el
+++ b/modules/undead-buffers.el
@@ -2,6 +2,16 @@
 
 ;;; Commentary:
 ;;
+;; Layer: 2 (Core UX).
+;; Category: C.
+;; Load shape: eager.
+;; Eager reason: global kill-buffer remap and window-kill bindings wanted from
+;;   the first session.
+;; Top-level side effects: three keymap-global-set (remaps kill-buffer; binds
+;;   M-S-o, M-S-m).
+;; Runtime requires: none.
+;; Direct test load: yes.
+;;
 ;; This library allows for "burying" selected buffers instead of killing them.
 ;; Since they won't be killed, I'm calling them "undead buffers".
 ;; The main function cj/kill-buffer-or-bury-alive replaces kill-buffer.