fix(chat): CH3 review fixes — phantom UN-9, allegiance-broadcast echo, /a legacy fallback

Applies the Opus review of Campaign CH slice CH3 (614a1e05):

- B1: UN-9 was a phantom divergence — ACE's CharacterOptions1.cs:47
  OR-sum is 0x50C4A54A (its own comment confirms 1355064650), identical
  to acdream's literal. The wrong 0x50C48D4A existed only in the research
  doc. Row deleted, register §5 reverted to 4 rows, research doc corrected
  with dated notes.
- S1/S4: AllegianceBroadcast (0x02000000) is a server-echoing channel —
  ACE's GameActionChatChannel handler includes the sender in its real-name
  Allegiance.Members broadcast (retail's DoAllegianceBroadcast has no
  AddTextToScroll), so the client must skip its local optimistic echo, not
  keep it. ChatChannelInfo.Legacy.IsSelfEchoChannel() now returns true for
  it; RouteLegacyChannel's comment corrected; Turbine.IsSelfEchoChannel()'s
  backwards comment rewritten truthfully.
- S3: retail's /a stays on the legacy AllegianceBroadcast bitflag until
  StartupTurbineChatSystem successfully starts Turbine chat — "never
  started" (TurbineChatState.Enabled == false) now falls back to legacy in
  both LiveSessionCommandRouter.RouteChat and
  DirectGameRuntimeCommandAdapter.TrySendChannel, while "enabled but no
  allegiance room" still correctly refuses locally.
- S5: added a LiveSessionEventRouter test proving the Options.Replace ->
  OnCharacterOptionsChanged seeding order, and RuntimeSettingsTargets /
  GameWindowLiveSessionOwnershipTests tests proving the concrete
  ICommandBus.Publish wiring and the single LiveSessionCommandSurface
  construction site.
- S6: AP-181 rewritten to name both of retail's omitted pre-send checks
  (IsMessageSafe silent-drop, then IsMessageSpam) and stop misattributing
  either to RouteLegacyChannel, which has no such gates.
- N1-N7: CharacterOptionId moved below SocialActions so its doc comment
  re-attaches; TurbineChatMembershipGate reuses TurbineChatDisplayNames
  instead of a duplicate table; the gate-to-refusal-text mapping is now
  shared via TurbineChatMembershipGate.ResolveRefusalText instead of
  duplicated in both hosts; ChatSettings.Default now matches ACE's real
  CharacterOptions2.Default (Roleplay/Society start off); a doc-comment
  clarifies only the five Hear toggles are server-backed; the register's
  §3 header recounted 129 -> 128.

Suite: 11,964 passed / 4 skipped / 0 failed (baseline 11,957/4/0 + 7 new
tests). Campaign ledger CH3 review column updated to APPROVE-WITH-FIXES.

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

src/AcDream.Core.Net/Messages/SocialActions.cs

@@ -23,24 +23,6 @@ namespace AcDream.Core.Net.Messages;
 /// References: r08 §3 rows for each opcode.
 /// </para>
 /// </summary>
-/// <summary>
-/// ACE <c>CharacterOption</c> ids (a LINEAR enum, distinct from the
-/// <c>CharacterOptions1</c>/<c>CharacterOptions2</c> BITFIELDS) — the first
-/// <c>u32</c> of a <c>SetSingleCharacterOption (0x0005)</c> payload. Only
-/// the six <c>ListenTo*Chat</c> ids Campaign CH slice CH3 (2026-08-09) needs
-/// are modeled here; ACE <c>Source/ACE.Entity/Enum/CharacterOption.cs</c>
-/// has the complete list.
-/// </summary>
-public enum CharacterOptionId : uint
-{
-    ListenToAllegianceChat = 0x1B,
-    ListenToGeneralChat = 0x23,
-    ListenToTradeChat = 0x24,
-    ListenToLFGChat = 0x25,
-    ListenToRoleplayChat = 0x26,
-    ListenToSocietyChat = 0x2E,
-}
-
 public static class SocialActions
 {
     public const uint GameActionEnvelope = 0xF7B1u;
@@ -205,3 +187,21 @@ public static class SocialActions
         return result;
     }
 }
+
+/// <summary>
+/// ACE <c>CharacterOption</c> ids (a LINEAR enum, distinct from the
+/// <c>CharacterOptions1</c>/<c>CharacterOptions2</c> BITFIELDS) — the first
+/// <c>u32</c> of a <c>SetSingleCharacterOption (0x0005)</c> payload. Only
+/// the six <c>ListenTo*Chat</c> ids Campaign CH slice CH3 (2026-08-09) needs
+/// are modeled here; ACE <c>Source/ACE.Entity/Enum/CharacterOption.cs</c>
+/// has the complete list.
+/// </summary>
+public enum CharacterOptionId : uint
+{
+    ListenToAllegianceChat = 0x1B,
+    ListenToGeneralChat = 0x23,
+    ListenToTradeChat = 0x24,
+    ListenToLFGChat = 0x25,
+    ListenToRoleplayChat = 0x26,
+    ListenToSocietyChat = 0x2E,
+}