Phase 6: town-crier news (website -> game)

BridgeTownCrier handles inbound towncrier.add / towncrier.remove, pushing
website-published news into GlobalTownCrierEntryList so every town crier
announces it until it expires. Both run on the Core thread (required: AddEntry
mutates a shared list and the criers send packets). An id maps to the created
TownCrierEntry so a later remove can pull it, and re-adding an id replaces the
prior entry.

Caps are enforced before touching the shared list -- line count, line length,
active-entry count, duration -- as defense in depth on top of the loopback trust
boundary: a buggy or compromised sidecar still cannot flood the criers or pin a
message forever. Config: Bridge.TownCrierMax{Lines,LineLength,Active,DurationSec}.

Verified with a sending stub and a probe that logs the actual crier list. Replies
and game state agree: add n1 -> towncrier.ok and the entry appears with the exact
lines; add n2 (8 lines over the cap of 6) -> towncrier.error and never enters the
list; remove n1 -> towncrier.ok and the entry is gone; remove unknown ->
towncrier.error. Evidence in docs/PLAN.md §16.

Adds BridgeJson.GetStringList for JSON string arrays, tools/stub_sidecar_crier.ps1,
and tools/scaffolding/BridgeCrierProbe.cs. This closes the pure-plugin inbound
work; only the PlayerVendorSale core edit (Phase 7) remains on the ServUO side.

Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>

overlay/Scripts/Custom/Bridge/BridgeConfig.cs

@@ -20,6 +20,11 @@ namespace Server.Custom.Bridge
 
         public static string LinkUrl { get; private set; }
 
+        public static int TownCrierMaxLines { get; private set; }
+        public static int TownCrierMaxLineLength { get; private set; }
+        public static int TownCrierMaxActive { get; private set; }
+        public static int TownCrierMaxDurationSec { get; private set; }
+
         public static bool Enabled { get; private set; }
 
         public static void Configure()
@@ -42,6 +47,11 @@ namespace Server.Custom.Bridge
 
             LinkUrl = Config.Get("Bridge.LinkUrl", "https://yoursite/link");
 
+            TownCrierMaxLines = Config.Get("Bridge.TownCrierMaxLines", 6);
+            TownCrierMaxLineLength = Config.Get("Bridge.TownCrierMaxLineLength", 200);
+            TownCrierMaxActive = Config.Get("Bridge.TownCrierMaxActive", 20);
+            TownCrierMaxDurationSec = Config.Get("Bridge.TownCrierMaxDurationSec", 86400);
+
             if (QueueCap < 16)
                 QueueCap = 16;
         }