fix(chat): Campaign CH round 3 — SpewBox flush-top/font, /help exact print sequence

User-gate round 3 findings (a)-(c):

(a) SpewBox: TopOffset moves from the round-1 60px placeholder to 0 (flush
to the viewport top). SpewBoxController never wired DatFont/Font at all
before this round, so it silently rendered through the 15px debug
BitmapFont fallback; it now resolves retail dat Font 0x40000025
(MaxCharHeight=11px) through a new RetailUiRuntime.Assets accessor —
the smallest font id confirmed in use by any currently-imported retail
LayoutDesc fixture, cross-referenced against every
tests/AcDream.App.Tests/UI/Layout/fixtures/*.json dump and confirmed
against the installed DAT via AcDream.Cli dump-font-atlas. It is also the
chat window's own smallest font (the 0x2100006F floating-window 1/2/3/4
indicator badges), so both selection criteria the brief offered agree.
Both remain best-available approximations, not resolved retail values —
register row AP-178 updated accordingly.

(b)/(c) /help and /help death: round 2 extracted the individual retail
strings byte-exact but never traced ClientCommunicationSystem::DoHelp's
complete print sequence. Byte-swept DoHelp's own range plus the five
Summary-branch functions it calls into (HelpEmote/HelpSquelch/
HelpStatusGroup/HelpTextGroup/HelpAllGroup) against the PDB-paired
acclient.exe. Retail's real shape: bare /help prints exactly TWO scroll
entries (HelpPrefixNote, then the 13-item AvailableHelpListing built from
DoHelp's own literals and each group's Summary_HelpType branch, in exact
source order) — not the acdream-invented cheat sheet BuildHelpText()
built before. Any resolved /help <verb> gets the SAME two-entry shape:
HelpPrefixNote, then ForMoreInformationPrefix concatenated directly onto
the verb's own Detail text (retail's own unsubstituted "<command>"
literal, ported verbatim). ChatCommandRouter.EmitVerbHelp applies this
uniformly to every resolved verb, not just death. An unresolved verb now
shows retail's real "Unknown command" fallback text; that fallback types
0x1A (ClientLocal), which retail routes to the SpewBox exclusively — a
gap ChatVM's UI.Abstractions layer can't yet reach, filed as ISSUES #367
/ register AP-186 rather than left silently unregistered.

Jump-in-air (round 2's open item 1) was root-caused and fixed separately
at a5a7eb4f between rounds — recorded in the campaign ledger.

Debug suite (all projects): 12,329 passed / 4 skipped / 1 failed — the
one failure is issue #351, a pre-existing Debug-only streaming flake
confirmed reproducing identically on the pristine pre-round-3 commit via
git stash, not a regression. Release verification covers every project
reachable without rebuilding AcDream.App: a live client process (PID
15064) held its own Release binaries locked for the session and was not
killed per project policy — AcDream.UI.Abstractions.Tests (867/867, the
layer both /help fixes live in) plus every other non-App-dependent
project, all 0 failed. AcDream.App/AcDream.App.Tests/AcDream.Core.Tests
(the SpewBox fix's layer) are green in Debug only this session.

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

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

@@ -221,7 +221,7 @@ public static class RetailClientCommandCatalog
     // (data_7de2f8) — the first paragraph only; the full multi-paragraph
     // block is reproduced verbatim by DoEndurance itself and is long
     // enough that only the opening line is duplicated here as a teaser —
-    // BuildHelpText below uses the SAME text callers already see through
+    // this is the SAME text callers already see through
     // ClientCommandController.
     private static readonly Definition Endurance = NoArguments(
         ClientCommandId.Endurance,
@@ -668,52 +668,6 @@ public static class RetailClientCommandCatalog
         return true;
     }
 
-    /// <summary>Help line generated from the same definition routing uses.</summary>
-    public static string BuildHelpText() => string.Join("\n        ",
-        Lifestone.HelpText,
-        Marketplace.HelpText,
-        PkArena.HelpText,
-        PkLiteArena.HelpText,
-        PkLite.HelpText,
-        HouseRecall.HelpText,
-        MansionRecall.HelpText,
-        HouseAbandon.HelpText,
-        QueryAge.HelpText,
-        QueryBirth.HelpText,
-        FrameRate.HelpText,
-        LockUi.HelpText,
-        Version.HelpText,
-        Location.HelpText,
-        Corpse.HelpText,
-        Die.HelpText,
-        Clear.HelpText,
-        SaveUi.HelpText,
-        LoadUi.HelpText,
-        SaveAutoUi.HelpText,
-        LoadAutoUi.HelpText,
-        Away.HelpText,
-        Consent.HelpText,
-        Emote.HelpText,
-        Emotes.HelpText,
-        Friends.HelpText,
-        Squelch.HelpText,
-        Unsquelch.HelpText,
-        Filter.HelpText,
-        Unfilter.HelpText,
-        MessageTypes.HelpText,
-        FillComponents.HelpText,
-        Endurance.HelpText,
-        Speaker.HelpText,
-        SetTitle.HelpText,
-        ChatToggle.HelpText,
-        NoTellToggle.HelpText,
-        JoinChannel.HelpText,
-        LeaveChannel.HelpText,
-        Permit.HelpText,
-        HouseAvailableList.HelpText,
-        AllegianceHometown.HelpText,
-        AllegianceInfo.HelpText);
-
     /// <summary>
     /// Every verb string this catalog dispatches, INCLUDING the
     /// specially-parsed "house"/"hou"/"allegiance"/"all" verbs (which are