refactor(tools): drop serviceEndpoint from fabric-guild-list response

Pairs with Fabric.Backend.Center@9e1909a which removed the
serviceEndpoint column. The agent-driven recruitment model no longer
needs a service-to-service URL distinction — agents post recruitment
broadcasts directly via fabric-send-message using their normal
session, no backend dials Fabric anymore.

Removed:
  - FabricSession.guilds.serviceEndpoint type field
  - fabric-guild-list response mapping for serviceEndpoint
  - Tool description text that taught agents to plumb it into
    dialectic_propose_topic.announce_guild_base_url (that param is
    also gone — see Dialectic.OpenclawPlugin@3ce5439).

Kept:
  - guild.purpose field (intent-based discovery, still wanted)
  - guild.endpoint field (clients dial it directly; unchanged)

src/tools.ts

@@ -367,15 +367,12 @@ export function registerFabricTools(
     name: 'fabric-guild-list',
     description:
       'List guilds the calling agent is a member of. Returns ' +
-      '{nodeId, name, purpose, status, serviceEndpoint} per row. ' +
+      '{nodeId, name, purpose, status} per row. ' +
       "`purpose` is a free-form description of what each guild is for — " +
-      'pick the guild whose purpose matches your intent. ' +
-      '`serviceEndpoint` is the internal URL another backend service ' +
-      'uses to reach this guild (NOT the client-facing url): pass it as ' +
-      '`announce_guild_base_url` to dialectic_propose_topic when you ' +
-      'want the dialectic-backend to broadcast topic lifecycle to a ' +
-      "channel in this guild. Use this tool BEFORE fabric-channel-list " +
-      'when a workflow asks you to pick the right guild by intent.',
+      'pick the guild whose purpose matches your intent. Use this tool ' +
+      'BEFORE fabric-channel-list when a workflow asks you to pick the ' +
+      'right guild by intent (e.g. "find a guild whose purpose mentions ' +
+      'debate broadcasts" → then list its announce-type channels).',
     parameters: {
       type: 'object',
       additionalProperties: false,
@@ -416,13 +413,6 @@ export function registerFabricTools(
           name: g.name,
           status: g.status,
           purpose: g.purpose ?? null,
-          // serviceEndpoint is what an in-deployment service uses to
-          // reach this guild — pass this into announce_guild_base_url
-          // on dialectic_propose_topic, NOT the client-facing endpoint.
-          // Null when the admin hasn't configured it (broadcasts will
-          // fail until set; ask hangman to run
-          // `cli node set-service-endpoint --node-id <id> --endpoint <url>`).
-          serviceEndpoint: g.serviceEndpoint ?? null,
         })),
       };
     },