feat(protocol2): guild and town-governor world-state streams (Part B ph.1)

Adds the first Part B streams from docs/PROTOCOL_2.md: guild rosters and
town governors ("mayors"), both outbound diff-board sweeps mirroring the
existing champ board.

Overlay:
- BridgeSocial (new): guild sweep+diff over BaseGuild.List -> guild.update /
  guild.remove (full-state upsert; disband detected via Disbanded), plus a
  real-time guild.join from EventSink.JoinGuild. (EventSink.CreateGuild is only
  the load-time factory, so creation is derived sidecar-side from a first-seen
  id, as champs do.)
- BridgeGovernance (new): city sweep over CityLoyaltySystem.Cities -> city.update
  (governor / governor-elect / election phase), gated on CityLoyaltySystem.Enabled.
- BridgeJson.Actor: shared serial/name/acct/webId/player writer used by both.
- BridgeConfig: GuildSweepSeconds (60s), CitySweepSeconds (300s).
- BridgeBoot: both wired into [bridge reload|sweepnow|status.

Sidecar:
- store: guilds + governors board tables with upsert/delete/all.
- main: route guild.update/remove and city.update into the boards.
- web: GET /guilds, GET /governors served from the store (snapshot-companion
  rule, so a fresh page or a restarted sidecar hydrates without the shard).

Docs: INTEGRATION.md event catalog (guild.*, city.update) + board endpoints;
PROTOCOL_2.md Part B phase 1 marked built.

Verified: sidecar cargo check clean; overlay compiles in the full ServUO
Scripts tree (0 errors, 0 warnings). Live end-to-end run still pending.

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

overlay/Scripts/Custom/Bridge/BridgeConfig.cs

@@ -31,6 +31,8 @@ namespace Server.Custom.Bridge
         public static int EconomySweepSeconds { get; private set; }
         public static int PageSweepSeconds { get; private set; }
         public static int ChampSweepSeconds { get; private set; }
+        public static int GuildSweepSeconds { get; private set; }
+        public static int CitySweepSeconds { get; private set; }
 
         public static string LinkUrl { get; private set; }
 
@@ -79,6 +81,16 @@ namespace Server.Custom.Bridge
             if (ChampSweepSeconds < 1)
                 ChampSweepSeconds = 1;
 
+            // Social/political sweeps (docs/PROTOCOL_2.md Part B). Both change slowly, so the
+            // defaults are unhurried; the pass is a handful of field reads over a small set.
+            GuildSweepSeconds = Config.Get("Bridge.GuildSweepSeconds", 60);
+            if (GuildSweepSeconds < 1)
+                GuildSweepSeconds = 1;
+
+            CitySweepSeconds = Config.Get("Bridge.CitySweepSeconds", 300);
+            if (CitySweepSeconds < 1)
+                CitySweepSeconds = 1;
+
             LinkUrl = Config.Get("Bridge.LinkUrl", "https://yoursite/link");
 
             TownCrierMaxLines = Config.Get("Bridge.TownCrierMaxLines", 6);