Record the Studio click-through and the dropped grouping features

The click-through passed with the AmmoType refs repointed and the schematic
underlay fixed. It also surfaced that the cutover dropped the Database Tools'
record grouping and drag-and-drop without recording them; CultLib's
studio-grouping cut map owns restoring them.

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

docs/cultcache-migration-cut.md

@@ -147,11 +147,24 @@ history, so history is left alone.
 
 Awaiting:
 - the operator play smoke;
-- the Studio click-through, including the three AmmoType refs;
 - nothing else from agents. The preset rework's Soul findings were fixed in
   `d503f076`, `d90a65a9` and `20f0f3d7`: 29 tests, 18 of 19 mutations caught
   (the survivor is the one noted above), and Unity batchmode reports 0 errors.
 
+The Studio click-through passed (operator, 2026-09-17). The three AmmoType refs
+were repointed in `515859cf`, and `dangling` lists zero. The schematic underlay
+was drawn across the whole inspector width, because the port dropped the old
+drawer's `FlexibleSpace`; it was restored and checked by the operator in the
+commit after `515859cf`.
+
+The Database Tools' record grouping (foldout tree by category, hardpoint type,
+manufacturer and hull type, with create-in-group) and drag-and-drop of record
+references were dropped by the cutover without being recorded. The attribute
+inventory above counted attributes, and those features were code in the window
+and in `DatabaseLinkInspector`. They are being restored in CultLib's Studio as
+member attributes (operator, 2026-09-17); `CultLib\docs\studio-grouping-cut.md`
+owns that work.
+
 Presets are not yet used by any spawner. The candidates are enemy ships
 (`ZoneGenerator.cs:309`) and the starting player ship
 (`ActionGameManager.StartGame`). Turrets and stations need a broader API than

docs/cultcache-migration-postmortem.md

@@ -34,8 +34,11 @@ the catalog.
   6 Mind Steward.
 
 **Still outstanding with the operator:**
-- the play smoke;
-- the Studio click-through, which also fixes three dangling `AmmoType` refs.
+- the play smoke.
+
+The Studio click-through passed on 2026-09-17. It also found that the cutover had
+dropped the Database Tools' record grouping and drag-and-drop without recording
+them, because the feature inventory counted attributes only.
 
 **CultLib missed its own size target.** The Caching core ended at 4,368 lines
 against a target of about 3,150, and `CultCache.cs` at 2,265 against about
@@ -333,8 +336,9 @@ These are applied to the Eureka skill and recorded in its changelog.
 
 ## Open follow-ups
 
-- **Operator:** play smoke; Studio click-through, including the three
-  `AmmoType` refs. Check `dangling` lists zero afterwards.
+- **Operator:** play smoke.
+- **Studio grouping and drag-and-drop:** restore as member attributes; owned by
+  `CultLib\docs\studio-grouping-cut.md`.
 - **CultLib:**
   - Studio detects on-disk changes before Save.
   - The release byte check is enforced by script.

docs/cultcache-migration-target.md

@@ -2,7 +2,7 @@
 
 Date: 2026-09-12
 
-Status: landed; awaiting operator play smoke and Studio click-through. Aetheria runs on CultLib's CultCache and CultMath, cut over on
+Status: landed; awaiting operator play smoke. Aetheria runs on CultLib's CultCache and CultMath, cut over on
 `codex/cultcache-cutover` from Cut 8a (`4f4beb0f`) through Cut 10 (`4a545469`
 to the commit that set this status). The means are in
 `docs/cultcache-migration-cut.md`.