feat(bridge): emit world.ruleset, the shard's published ruleset

Protocol 3.0 §5 (docs/link/v3.md). One frame describing how this shard is
actually configured — expansion, which optional systems are on, skill/stat
caps, account and house limits, champion scroll rules, the save/restart
schedule — so the website's rules page cannot drift from the server.

Modelled on BridgeBoot.EmitHello, not on the diff sweeps: the ruleset changes
only when an operator edits a .cfg, so there is nothing to poll. It subscribes
Connected_Core, so a sidecar that comes up second still learns the ruleset,
and `[bridge reload` re-emits for an operator who just edited a file.

The frame is built from an EXPLICIT ALLOWLIST of Config.Get calls. Config.Entries
is never enumerated — that would sweep in every key on the server, secrets
included — and Server.cfg, Staff.cfg, Email.cfg, DataPath.cfg, Bridge.cfg,
Compiler.cfg, Reports.cfg and Client.cfg are named as excluded both here and in
a code comment. The one connection detail published is Bridge.PublicConnectAddress,
blank by default, which an operator sets deliberately for this purpose.

`rev` is FNV-1a over the body so an unchanged reconnect is a site-side no-op.
String.GetHashCode() is deliberately not used: it is seeded per process, so it
would change on every restart and defeat the diff.

Verified by compiling the full ServUO Scripts tree (6,205 files, net48, EJ) with
this overlay substituted for the deployed Bridge copy — clean.

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

overlay/Scripts/Custom/Bridge/BridgeConfig.cs

@@ -36,6 +36,11 @@ namespace Server.Custom.Bridge
         public static int PresenceSweepSeconds { get; private set; }
         public static int HousingSweepSeconds { get; private set; }
 
+        // ---- shard ruleset (https://gitea.whitlocktech.com/RunicGateway/docs/src/branch/main/link/v3.md §5) ----
+        public static bool RulesetEnabled { get; private set; }
+        public static string PublicConnectAddress { get; private set; }
+        public static bool RulesetIncludeSchedule { get; private set; }
+
         public static string LinkUrl { get; private set; }
 
         public static int TownCrierMaxLines { get; private set; }
@@ -107,6 +112,14 @@ namespace Server.Custom.Bridge
             if (HousingSweepSeconds < 1)
                 HousingSweepSeconds = 1;
 
+            // The ruleset frame is not a sweep — it is emitted once per sidecar connect (and on
+            // `[bridge reload`), so it has no interval. PublicConnectAddress is the ONE connection
+            // detail the bridge will publish, and only because an operator typed it here for that
+            // purpose; Server.cfg's Address/Port are never read (see BridgeRuleset's allowlist note).
+            RulesetEnabled = Config.Get("Bridge.RulesetEnabled", true);
+            PublicConnectAddress = Config.Get("Bridge.PublicConnectAddress", "");
+            RulesetIncludeSchedule = Config.Get("Bridge.RulesetIncludeSchedule", true);
+
             LinkUrl = Config.Get("Bridge.LinkUrl", "https://yoursite/link");
 
             TownCrierMaxLines = Config.Get("Bridge.TownCrierMaxLines", 6);