fix(chat): #363 — retail 0x1A typing for command refusals via the interface-text seam

ChatVM gains an OnInterfaceText hook + ShowInterfaceText(text), the
App-layer composition wires it to RuntimeCommunicationState.AddText,
and ChatCommandRouter routes every retail-0x1A command refusal through
it instead of the chat log's 0x00 sink. UI.Abstractions still never
references Runtime directly; unwired hosts (headless, tests) fall back
to the chat log tagged ClientLocal so no text is ever silently lost.

Reclassified per register row AP-183 (DoChannelList/On/Off, DoAllegiance,
DoHouseAvailableList — the last also corrected to retail's own bad-house-
type string instead of a synthesized "Usage:" line) and newly wired two
sites that previously showed nothing at all (DoStupidChannelHack's bare
legacy-channel-verb refusal, DoReply's message-but-no-last-teller
refusal). The generic bad-args fallback now resolves WeenieErrorMessages
0x026 ("That is not a valid command.", retail's HandleFailureEvent(0x26))
instead of synthesizing "Usage: {Usage}". DoSpeaker/DoEndurance/DoTitle
are untouched — already correct at 0x00.

Also closes #367 (DoHelp's "Unknown command" fallback and the degenerate-
prefix refusal now reach the SpewBox too) and retires register row
AP-186, whose own filing proposed exactly this seam shape.

Full Release suite: 12,542 passed / 4 skipped / 0 failed (baseline
12,466/4/0 at ff2784ea).

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

src/AcDream.UI.Abstractions/Panels/Chat/RetailClientCommandCatalog.cs

@@ -346,11 +346,18 @@ public static class RetailClientCommandCatalog
 
     // ClientCommunicationSystem::DoHouseAvailableList @ 0x00570510. Exact
     // retail help: acclient_2013_pseudo_c.txt:1031049 (data_7dd9d0).
+    // #363 / register row AP-183: the bad-args refusal is retail's own
+    // specific string too, verified at acclient_2013_pseudo_c.txt:381481
+    // (AddTextToScroll(..., 0x1a, ...)), full text at
+    // acclient_2013_pseudo_c.txt:1029383 (data_7d0a98) — NOT the
+    // acdream-synthesized "Usage: /hslist <house type>" line this
+    // Definition used to fall back to.
     private static readonly Definition HouseAvailableList = new(
         ClientCommandId.HouseAvailableList,
         Usage: "/hslist <house type>",
         HelpText: "@hslist <house type> - Lists the number and, if appropriate, positions of houses currently available for purchase. Types include: Apartment, Cottage, Villa, Mansion",
-        ValidateArguments: static arguments => HouseTypes.ContainsKey(arguments.Trim()));
+        ValidateArguments: static arguments => HouseTypes.ContainsKey(arguments.Trim()),
+        InvalidArgumentsText: "Please see @help hslist for more information on how to use this command");
 
     // ClientCommunicationSystem::DoChannelIndex @ 0x0056E640. No help
     // string was extracted for the bare form; the verb is admin/advocate/