feat(shard): Protocol 2.0 cross-links — titles, guild, governor, houses

Phase 3: surface the new board data on existing character/user pages.

- Character sheet: render the char.profile titles block (fame/karma + skill +
  selected reward title; numeric clilocs skipped since the site has no cliloc
  table yet), plus "Guildmaster" and "Governor of <city>" chips.
- Char profile enrichment (player/admin /shard/char/:serial, one shared path):
  attach guild + governorOf from our own boards. Guild is LEADERSHIP-ONLY — it's
  verifiable from current board state, whereas guessing membership from stale
  guild.join events risks showing a wrong guild, so we return null instead.
- Admin user detail (/admin/users/:id): new "Standing" section (governorships
  held + guilds led) via GET /users/:id/shard/standing; Houses rows now show the
  registry fields (decay level, placement price, co-owner/friend counts) already
  returned by listHousesForAccounts.

Server 179/179, client build clean, swagger regenerated.

Refs .plans/protocol2-integration.md (Phase 3).

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

server/src/model/shardState/shardState.model.js

@@ -382,6 +382,22 @@ async function replaceGuilds(guilds) {
   for (const ev of guilds || []) await upsertGuild(ev)
 }
 
+// The guild an actor leads (cross-link on the character sheet). Leadership only —
+// see the db note; membership for rank-and-file isn't in the feed, so we return
+// null rather than show a possibly-stale guess.
+async function findGuildForActor({ serial, acct }) {
+  const rows = await db.findGuildLedByActor(serial ?? null, acct ?? null)
+  const g = rows[0]
+  if (!g) return null
+  return { id: g.id, name: g.name, abbr: g.abbr, alliance: g.alliance, role: 'leader' }
+}
+
+// Guilds led by any of a user's linked accounts (admin user-detail cross-link).
+async function listGuildsLedForAccounts(accounts) {
+  const rows = await db.listGuildsLedByAccounts(accounts)
+  return rows.map((g) => ({ id: g.id, name: g.name, abbr: g.abbr, alliance: g.alliance, leaderName: g.leader_name }))
+}
+
 // ── Town governors (Protocol 2.0) ──────────────────────────────────────────
 // Upsert a city's governance snapshot (city.update) AND capture term history.
 // Term capture runs first (it reads the CURRENT open term to decide whether the
@@ -543,6 +559,8 @@ module.exports = {
   clearGuilds,
   listGuilds,
   replaceGuilds,
+  findGuildForActor,
+  listGuildsLedForAccounts,
   upsertGovernor,
   listGovernors,
   listGovernorshipsForAccounts,