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>

tests/AcDream.UI.Abstractions.Tests/Panels/Chat/RetailCommandHelpTableTests.cs

@@ -165,4 +165,99 @@ public sealed class RetailCommandHelpTableTests
         Assert.True(RetailCommandHelpTable.TryGetHelpText(verb, out string text));
         Assert.Equal(expected, text);
     }
+
+    // ── Campaign CH user-gate round 3 (2026-08-10) ──────────────────────
+    // The round 2 pass extracted the individual STRINGS byte-exact; this
+    // round traces DoHelp's complete PRINT SEQUENCE — see the class
+    // remarks. These pin the newly-swept literals byte-exact against
+    // tools/pdb-extract/sweep_weenie_strings.py's output.
+
+    [Fact]
+    public void HelpPrefixNote_HasRetailsLeadingAndTrailingBlankLines()
+    {
+        // acclient_2013_pseudo_c.txt:394980 (data_0x7e11e0) -- the original
+        // round-2 extraction dropped the leading "\n" and the trailing
+        // "\n\n" that are part of retail's own literal.
+        Assert.Equal(
+            "\nNote: You may substitute a forward slash (/) for the at symbol (@).\n\n",
+            RetailCommandHelpTable.HelpPrefixNote);
+    }
+
+    [Fact]
+    public void ForMoreInformationPrefix_KeepsRetailsUnsubstitutedPlaceholderVerbatim()
+    {
+        // acclient_2013_pseudo_c.txt:395087 (data_0x7e1178) -- "<command>"
+        // is retail's own literal text, not a format placeholder acdream
+        // failed to substitute; the decomp shows no sprintf/substitution
+        // call between this literal and its use.
+        Assert.Equal(
+            "For more information, type @help <command>.\n",
+            RetailCommandHelpTable.ForMoreInformationPrefix);
+    }
+
+    [Fact]
+    public void UnknownCommand_MatchesRetailsExactFallbackText()
+    {
+        Assert.Equal("Unknown command", RetailCommandHelpTable.UnknownCommand);
+    }
+
+    [Fact]
+    public void AvailableHelpListing_MatchesDoHelpsCompleteThirteenItemSequence()
+    {
+        // acclient_2013_pseudo_c.txt:395091-395249 (DoHelp bare-arg "else"
+        // branch), swept whole via sweep_weenie_strings.py --range
+        // 0x57f9e0 0x57fe7e --ascii-only against the PDB-paired
+        // C:\Users\erikn\Downloads\acclient.exe (verified MATCH). Exact
+        // source order: header, then allegiances/channels/chatting/death/
+        // emote/fillcomps/friends/house/squelch/status/text/commands.
+        Assert.Equal(
+            "Available help:\n"
+            + "@help allegiances - Commands to help you deal with your Allegiance.\n"
+            + "@help channels - How to communicate with people in your allegiance or fellowship.\n"
+            + "@help chatting - How to chat publically and privately.\n"
+            + "@help death - Commands for making, finding, and looting corpses.\n"
+            + "@help emote - How to perform text and action emotes.\n"
+            + "@help fillcomps - A command to help you buy components in bulk.\n"
+            + "@help friends - Commands to help you manage your friends list.\n"
+            + "@help house - Commands that help you manage your house, including guest and storage management.\n"
+            + "@help squelch - Commands that let you block out messages from other players.\n"
+            + "@help status - Commands that display useful information.\n"
+            + "@help text - Commands that help you manage your text window.\n"
+            + "@help commands - Lists all commands.\n",
+            RetailCommandHelpTable.AvailableHelpListing);
+    }
+
+    [Fact]
+    public void DeathGroup_ThroughRouter_PrintsRetailsCompleteTwoEntryShape()
+    {
+        // Campaign CH user-gate round 3, finding (c): "/help death"'s
+        // CONTENT was already byte-exact (round 2); what was still wrong
+        // was the SHAPE. Retail's DoHelp prints two scroll entries for any
+        // resolved verb: HelpPrefixNote, then ForMoreInformationPrefix
+        // concatenated directly onto the verb's own Detail text (no blank
+        // line, no third entry). Exercised at the router level (not just
+        // the table) so this is the actual /help death user experience,
+        // not merely the table's stored string.
+        var log = new AcDream.Core.Chat.ChatLog();
+        var vm = new ChatVM(log, displayLimit: 50);
+        var bus = new RecordingCommandBus();
+
+        var outcome = ChatCommandRouter.Submit(
+            "/help death", vm, bus, ChatChannelKind.Say);
+
+        Assert.Equal(SubmitOutcome.ClientHandled, outcome);
+        var entries = log.Snapshot();
+        Assert.Equal(2, entries.Length);
+        Assert.Equal(RetailCommandHelpTable.HelpPrefixNote, entries[0].Text);
+        Assert.Equal(
+            RetailCommandHelpTable.ForMoreInformationPrefix
+                + RetailCommandHelpTable.DeathGroupDetail,
+            entries[1].Text);
+    }
+
+    private sealed class RecordingCommandBus : ICommandBus
+    {
+        public List<object> Published { get; } = new();
+        public void Publish<T>(T command) where T : notnull => Published.Add(command);
+    }
 }