FABRIC-2.md: record IS/DEFER@ closure (commit 6f59e4f)

Co-Authored-By: Claude Sonnet 5 <noreply@anthropic.com>

FABRIC-2.md

@@ -236,9 +236,18 @@ and recorded.
   > closed to the same point minus one remaining per-word gap each (`:` needs a
   > `vm->compiling_word`-tracking field that doesn't exist yet; DEFER's own runtime is a
   > structurally different DF usage — dispatch reassignment via a stored pointer, not a
-  > plain value). Full suite: 54 theories, green. Not yet done: IS/DEFER@ (need the
-  > FIND-family name-resolution gap first), the vocabulary-chain mechanics, the
-  > block-window cache, the hot-words cache — each flagged as its own project, not started.
+  > plain value). Full suite: 54 theories, green.
+  >
+  > **Continued, commit `6f59e4f`.** IS/DEFER@ (`StarForth_Defer_Words.thy`) now modelled
+  > end to end too, sidestepping the FIND-family name-resolution gap (still itself
+  > unmodelled everywhere in this suite) the same way `physics_freeze_words.c`'s
+  > FREEZE-WORD/UNFREEZE-WORD/etc. already do — parameterised over an explicit
+  > `target_wid_opt`/`is_defer_word` pair standing in for "whatever `vm_find_word` plus the
+  > `func != defer_runtime` identity check would have resolved." `defer_runtime` itself
+  > remains unmodelled: unlike IS/DEFER@'s plain-value DF access, it uses the DF value as a
+  > dispatch target through `word_table`, gap (c), a structurally different case. Not yet
+  > done: the vocabulary-chain mechanics, the block-window cache, the hot-words cache —
+  > each flagged as its own project, not started.
 
 - [ ] **5.3 — Shrink the subsystem documents.** `ARTEMIS.md`, `HERMES.md`, `CONSOLE.md`,
   `TRIPOD.md` need trimming now that `FABRIC-2.md` (via `FABRIC.md`) is the design-of-record.