proof/: partially close the dictionary-insertion gap (StarForth_Defining_Words.thy)

Every prior file in the word-source sweep only ever read the abstract
dictionary table; none modelled insertion. dict_insert_entry now models
the word_id-assignment/dictionary-table/latest_id/word_id_next-counter
portion of vm_create_word (dictionary_management.c:379-470), reusing
word_id_next :: nat -- a field already declared in StarForth_Base.thy but
never previously written by any theory. Applied to :, CREATE, VARIABLE,
CONSTANT (StarForth_Defining_Words.thy) and DEFER (StarForth_Defer_Words.thy)
via forth_*_entry_half definitions, each named to keep visible what's
still not modelled: the TIB name-parse dependency, the DF (data-field)
write each word does afterward, and (for :) vm->compiling_word tracking,
none of which have a vm_state counterpart. Pin-shadow conflicts are
sidestepped via an explicit pinned_conflict :: bool parameter, the same
technique already used for the XT-pop gap elsewhere in this suite.

Full suite (54 theories) verifies green.

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

proof/COVERAGE.md

@@ -70,7 +70,7 @@ library itself is separately covered by `StarForth_Q48_16.thy`).
 | `format_words.c` | `StarForth_Format_Words.thy` | 17/19 (`#`/`#S` multi-precision division deferred) |
 | `system_words.c` | `StarForth_System_Words.thy` | 10/16 + `(ABORT")` helper |
 | `vocabulary_words.c` | `StarForth_Vocabulary_Words.thy` | 1/7 partial (entire subsystem is file-scope statics, see FINDINGS.md §1) |
-| `defining_words.c` | `StarForth_Defining_Words.thy` | 4/19 full + 2 guard-only (`:`/`;`) |
+| `defining_words.c` | `StarForth_Defining_Words.thy` | 4/19 full + 2 guard-only (`:`/`;`) + 4 entry-creation-half (`:`/CREATE/VARIABLE/CONSTANT, added 2026-08-14) |
 | `acl_words.c` | `StarForth_ACL_Words.thy` | 7/12 (5 already covered by the pre-existing `ACL_*.thy` policy theories) |
 | `dictionary_heat_diagnostic_words.c` | `StarForth_Dictionary_Heat_Diagnostic_Words.thy` | 4/6 full + 1 partial |
 | `physics_freeze_words.c` | `StarForth_Physics_Freeze_Words.thy` | 6/9 |
@@ -81,7 +81,7 @@ library itself is separately covered by `StarForth_Q48_16.thy`).
 | `framebuffer_words.c`, `keyboard_words.c` | `StarForth_Framebuffer_Words.thy`, `StarForth_Keyboard_Words.thy` | hosted-build fallback branches fully modelled |
 | `scroll_words.c`, `ttf_words.c` | `StarForth_Scroll_Words.thy`, `StarForth_TTF_Words.thy` | sentinel-only — words don't exist on hosted builds at all |
 | `lifecycle_words_hosted.c` | `StarForth_Lifecycle_Words_Hosted.thy` | 100% — zero deferred remainder |
-| `defer_words.c` | `StarForth_Defer_Words.thy` | modelled, but words are dead (shadowed, see FINDINGS.md §3) |
+| `defer_words.c` | `StarForth_Defer_Words.thy` | live (see FINDINGS.md §3 correction); DEFER's entry-creation half modelled (added 2026-08-14) |
 | `log_words.c` | `StarForth_Log_Words.thy` | 100% |
 | `q48_words.c` | `StarForth_Q48_Words.thy` | 17/23 |
 | `inference_words.c` | `StarForth_Inference_Words.thy` | 5 accessors full; rest guard/shape |
@@ -103,8 +103,16 @@ effort on the scale of what's already here:
   the abstract `dict_entry` model is word-id-indexed, not addressed; no
   independent `dsp` register exists to model `SP@`/`SP!` against either.
 - **Dictionary insertion** (`vm_create_word`, used by `:`, CREATE, VARIABLE,
-  CONSTANT, DEFER) — every other file only ever *reads* the abstract
-  dictionary table; no insertion operation has ever been modelled.
+  CONSTANT, DEFER) — **partially closed 2026-08-14.** `dict_insert_entry`
+  (`StarForth_Defining_Words.thy`) now models the word_id-assignment/
+  dictionary-table/`latest_id`/`word_id_next`-counter portion, reused by
+  all five words' `forth_*_entry_half` definitions. Still not modelled:
+  the name parse (TIB gap, same as everywhere else in this suite),
+  `vm->compiling_word` tracking (no vm_state field), the data-field (DF)
+  write each of the five words does afterward (still gap (b) below), and
+  the pin-shadow name-scan guard (sidestepped via an explicit
+  `pinned_conflict :: bool` parameter, same technique as the XT-pop gap
+  elsewhere in this suite).
 - **The vocabulary chain mechanics** (VOCABULARY/DEFINITIONS/CONTEXT/CURRENT/
   FORTH) — file-scope statics, see FINDINGS.md §1, instance #5.
 - **The hot-words cache** (`physics_benchmark_words.c`) and **the bucket/