feat(chat): Campaign CH slice CH3 — side-channel membership, wire, and echo parity

Ports retail's SendTurbineChat (@0x0057db10) local pre-send membership gate
so Roleplay/Society/Olthoi stop silently swallowing outbound chat: a new
TurbineChatMembershipGate checks Turbine availability and the player's own
Hear*Chat option before sending, raising "Turbine chat is not available."
or the 0x0551 YouAreNotListeningTo_Channel refusal through the CH2 AddText
chokepoint instead. Wired into both the graphical (LiveSessionCommandRouter)
and headless (DirectGameRuntimeCommandAdapter) send paths so they can't
diverge. Retracts the 26-day-old false "ACE doesn't run a TurbineChat
server" claim from ISSUES.md, the roadmap, and project_chat_pipeline.md —
ACE's TurbineChat implementation is complete and on by default; the real
bug was treating Hear*Chat as a display filter instead of room membership.

Also: implements SetSingleCharacterOption (0x0005), the only wire message
that actually joins/leaves a Turbine room, and wires the five Settings Chat
toggles to it (publish on Save, changed bits only) plus seeds ChatSettings
from the server's own CharacterOptions2 on every PlayerDescription. Fixes
the legacy-channel double-print (Fellow/Vassals/Patron/Monarch/CoVassals
skip the local echo now that ChatChannelInfo.IsSelfEchoChannel is finally
consulted). Routes /a to Turbine unconditionally (retail's @a never falls
back to the legacy bitflag) and adds /ab for the legacy AllegianceBroadcast
verb retail actually has. Surfaces a nonzero TurbineChat ack HResult instead
of discarding it silently. Deletes the malformed, callerless SetCharacterOptions
(0x01A1) and AddChannel/RemoveChannel (0x0145/0x0146) builders.

Files every AC-specific algorithm change cites the named retail decomp
(SendTurbineChat 0x0057db10, StartupTurbineChatSystem 0x0057EFB0,
GameActionSetSingleCharacterOption) plus ACE/holtburger cross-checks.
Register rows AP-181 (no client-side spam throttle) and UN-9 (an
incidentally-discovered CharacterOptions1.Default literal mismatch, not
investigated further) filed per the divergence-register rule.

11,957 passed / 4 skipped / 0 failed (full Release suite, up from the
11,916/4/0 baseline).

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

src/AcDream.App/Composition/SessionPlayerComposition.cs

@@ -322,6 +322,14 @@ internal sealed class SessionPlayerCompositionPhase
         Fault(SessionPlayerCompositionPoint.StreamingCreated);
 
         bindings = new SessionPlayerRuntimeBindings();
+        // CH3 (2026-08-09): constructed here (rather than at its original
+        // site further down, alongside LiveSessionAppSource) purely so
+        // RuntimeSettingsTargets can publish SetSingleCharacterOption
+        // through the SAME stable command surface the retained UI uses —
+        // LiveSessionCommandSurface has no dependencies of its own, so
+        // hoisting its construction is inert; the later site now reuses
+        // this instance instead of constructing a second one.
+        var liveSessionCommands = new LiveSessionCommandSurface();
         var settingsTargets = new RuntimeSettingsTargets(
             new SilkRuntimeDisplayWindowTarget(d.Window),
             live.DrawDispatcher,
@@ -329,6 +337,7 @@ internal sealed class SessionPlayerCompositionPhase
             streaming,
             d.RenderRange,
             interaction.RetainedUi?.Host.Root,
+            liveSessionCommands,
             d.Log);
         bindings.Adopt(
             "runtime settings targets",
@@ -419,6 +428,7 @@ internal sealed class SessionPlayerCompositionPhase
             worldReveal,
             spawnClaimClassifier,
             bindings,
+            liveSessionCommands,
             ref bindingsOwnedByScope);
     }
 
@@ -436,6 +446,10 @@ internal sealed class SessionPlayerCompositionPhase
         WorldRevealCoordinator worldReveal,
         DatSpawnClaimHydrationClassifier spawnClaimClassifier,
         SessionPlayerRuntimeBindings bindings,
+        // CH3 (2026-08-09): threaded through from ComposeCore, where it was
+        // constructed early (alongside RuntimeSettingsTargets) instead of at
+        // its original site below — see the construction-site comment.
+        LiveSessionCommandSurface liveSessionCommands,
         ref bool bindingsOwnedByScope)
     {
         SessionPlayerDependencies d = _dependencies;
@@ -474,7 +488,9 @@ internal sealed class SessionPlayerCompositionPhase
             d.Log);
 
         LiveSessionController liveSession = d.Runtime.Session;
-        var liveSessionCommands = new LiveSessionCommandSurface();
+        // liveSessionCommands arrives as a parameter — constructed in
+        // ComposeCore alongside RuntimeSettingsTargets (CH3, 2026-08-09) and
+        // threaded through, not reconstructed here.
         var liveSessionSource = new LiveSessionAppSource(
             liveSession,
             liveSessionCommands);