docs(load-graph): seed module inventory and annotate foundation headers

I started the init.el load-graph classification with the foundation batch. I added docs/design/module-inventory.org as the living per-module inventory and annotated the seven foundation modules (system-lib, user-constants, host-environment, system-defaults, keyboard-compat, keybindings, config-utilities) with the load-graph header contract: layer, category, load shape, eager reason, top-level side effects, runtime requires, and direct-test-load safety.

I changed no load order, so init.el keeps its current eager order. The inventory records one hidden dependency for Phase 2: system-defaults uses host-environment and user-constants symbols at load while declaring them eval-when-compile, so the compiled module cannot load standalone.

1 files changed, 11 insertions, 1 deletions

diff --git a/modules/keyboard-compat.el b/modules/keyboard-compat.el
index 22263e9c..914a343a 100644
--- a/modules/keyboard-compat.el
+++ b/modules/keyboard-compat.el
@@ -2,7 +2,17 @@
 ;; author: Craig Jennings <c@cjennings.net>
 
 ;;; Commentary:
-
+;;
+;; Layer: 1 (Foundation).
+;; Category: F/S.
+;; Load shape: eager.
+;; Eager reason: normalizes terminal/GUI key input so the first session's
+;;   keybindings resolve consistently.
+;; Top-level side effects: adds `cj/keyboard-compat-terminal-setup' to
+;;   `emacs-startup-hook'.
+;; Runtime requires: host-environment.
+;; Direct test load: yes (registers a startup hook; batch-safe).
+;;
 ;; This module fixes keyboard input differences between terminal and GUI Emacs.
 ;;
 ;; THE PROBLEM: Meta+Shift keybindings behave differently in terminal vs GUI