docs(load-graph): classify text/editing command modules

Second classification batch: the nine custom-* text/editing command helpers (case, comments, datetime, buffer-file, line-paragraph, misc, ordering, text-enclose, whitespace). I annotated each with the load-graph header contract and added a Batch 2 table to the inventory. They're all Layer 2, eager only to register a C-; submap at load, with no necessary eager reason, so all are Phase 3/4 deferral candidates.

The inventory records a second hidden dependency for Phase 2: custom-buffer-file guards its C-; b registration with (when (boundp 'cj/custom-keymap) ...) and declares the keymap only via eval-when-compile, so the binding silently drops when the module loads without keybindings.

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