feat(phase700): member roster CSV and moderation timeout export mesh parity (v0.8.675)

Add signed member roster CSV mesh (RPC 118) and moderation timeout export CSV
(RPC 119) with member-csv-ui, platform member-csv-mixin, delivery-receipts store
methods, guild gossip, ui-flow IPC, agentctl journeys, and test:ci-phase700.

headless.js

@@ -3797,6 +3797,40 @@ class HeadlessSession {
     }
   }
 
+  async runMemberRosterCsvJourney () {
+    if (!this.platform) throw new Error('headless not started')
+    await this.registerUser({ username: 'mb700', displayName: 'Member CSV 700' })
+    await this.createGuild({ name: 'Member CSV 700', publicListing: false })
+    await this.wait({ mode: 'guild' }, 45000)
+    const pushed = await this.platform.pushMemberRosterCsvToMesh()
+    const v = await this.refreshView()
+    if (!pushed?.signature && !v.memberRosterCsvMeta?.signature) {
+      throw new Error('expected signed member roster CSV after mesh push')
+    }
+    return {
+      guildMemberCsvCount: (v.memberRosterCsvRows || []).length,
+      hasMeta: v.memberRosterCsvMeta != null
+    }
+  }
+
+  async runModerationTimeoutExportJourney () {
+    if (!this.platform) throw new Error('headless not started')
+    await this.registerUser({ username: 'to700', displayName: 'Timeout 700' })
+    await this.createGuild({ name: 'Timeout 700', publicListing: false })
+    await this.wait({ mode: 'guild' }, 45000)
+    const pushed = await this.platform.pushModerationTimeoutExportToMesh()
+    const v = await this.refreshView()
+    if (!pushed?.signature) {
+      throw new Error('expected signed moderation timeout CSV export')
+    }
+    return {
+      guildMemberCsvCount: (v.moderationTimeoutExportCsvRows || []).length,
+      hasTimeoutExport:
+        v.lastModerationTimeoutExport != null ||
+        (v.moderationTimeoutExportCsvRows || []).length > 0
+    }
+  }
+
   async runForumPostSearchJourney () {
     if (!this.platform) throw new Error('headless not started')
     await this.registerUser({ username: 'fm672', displayName: 'Forum 672' })