benilla's layer speaks the 1.12 API alone: handlers take this and no arguments, GetBinding answers the 1.12 list, the Key Bindings page captures through its window, /errors chains the error handler, and the host hooks leave the VM (#569)

benilla's layer now uses only the 1.12 API and the 1.12 Lua forms, and the host hooks it used are gone from the VM.

- **The VM calls handlers as 1.12.1 does.** A handler body is compiled as the chunk itself, so `self` in it is an ordinary global (`0x704c70`). A handler is called with no arguments (`0x705199`). The loader reads no `function=` attribute.
- **`GetBinding`/`GetNumBindings` answer the 1.12 list** (`0x4b7f60`): `HEADER_*` section rows, plus every key bound to a command, with no category column. The stock `KeyBindingFrame` now shows its section headers and both key columns.
- **The Key Bindings page captures keys through its own window**, as `Blizzard_BindingUI` does: the frame's `OnKeyDown` for keys, clicks for mouse buttons, and the wheel. It takes the `Benilla` prefix, so loading the stock binding addon no longer breaks it. The UI pointer feed now hands frames mouse buttons 4 and 5.
- **`/errors` keeps its log by chaining the Lua error handler**, and the stock ScriptErrors dialog is unchanged. Load failures that never raise now print one chat line each at world entry.
- **Slash commands:** `/reload` and `/errors` are `SlashCmdList` rows in the layer. `/convertraid` is gone; 1.12.1 has no such command. The dev commands are host rows in dev builds only, so a player build answers them with the unknown-command line once.
- **Naming:** every global the layer defines is `Benilla`-prefixed. `BenillaBindCapture`, `KeyBindings_OnHostKey`, the three script-error globals and `SubmitChatInput` are removed.

Verified:
- New tests for each rule and each removed surface; 16 mutations each fail a test.
- Region dumps of the Options window (general page, Key Bindings, armed) are identical before and after.
- `scripts/gates.sh` and `scripts/smoke.sh` are green.
- A live run bound a key, a Shift chord and the middle button through the page, and opened `/errors`.

Built on macOS; no platform seam touched.

Fixes #539
Fixes #544
Fixes #407
Part of #171

🤖 Generated with [Claude Code](https://claude.com/claude-code)

Co-Authored-By: Claude Opus 5.5 (1M context) <noreply@anthropic.com>

crates/benilla-ui/src/script/tests/reference_surface.rs

@@ -33,15 +33,13 @@ fn allowed_beyond_1_12() -> HashSet<&'static str> {
         // `getfenv(0)`); ours does, as our `getglobal`/`setglobal` are written over it.
         "_G",
         // ── WoW API past 1.12 ──
-        // Only `SubmitChatInput` is called from our UI files (`ScriptLogFrame.xml`'s slash
-        // commands); each of the rest awaits its 1.12 equivalent, removal or a reason.
+        // Each awaits its 1.12 equivalent, removal or a reason; none is called from our UI files.
         "CancelUnitBuff",
         "GetCursorInfo",
         "GetInventoryItemID",
         "GetPlayerFacing",
         "GetTradePartnerName",
         "IsGossipOptionCoded",
-        "SubmitChatInput",
         "UnitAura",
         "UnitIsAFK",
         "UnitIsDND",
@@ -1514,3 +1512,24 @@ fn the_nameplate_verbs_ignore_their_arguments_and_return_nothing() {
         "zero values — observably different from nil for a caller that counts"
     );
 }
+
+/// The host seams benilla's own interface used are gone, now that it speaks 1.12 alone: the key
+/// capture, the error-log reads, the chat forwarders and the uncalled binding-set probe.
+#[test]
+fn the_layers_host_seams_are_gone() {
+    let s = script();
+    for name in [
+        "BenillaBindCapture",
+        "BenillaCharacterBindingsExist",
+        "BenillaGetNumScriptErrors",
+        "BenillaGetScriptErrorInfo",
+        "BenillaClearScriptErrors",
+        "SubmitChatInput",
+        "BenillaChatTabPressed",
+    ] {
+        assert!(
+            s.eval::<bool>(&format!("return {name} == nil")).unwrap(),
+            "{name} is still a global"
+        );
+    }
+}