Phase 1003: add mesh stability UI diagnostics actions journey stub (v0.8.970)

Headless journey validates diagnostics actions keys snapshot and
four-button chain embed HTML without changing observable UI behavior.

Co-authored-by: Cursor <[email protected]>

headless.js

@@ -1868,6 +1868,30 @@ class HeadlessSession {
     return { guildId: gid, fields, snapshot, embedHtml, view }
   }
 
+  /** Journey stub: mesh stability UI diagnostics actions chain keys + embed snapshot (Phase 1003). */
+  async runMeshStabilityUiDiagnosticsActionsJourney (guildId) {
+    if (!this.platform) throw new Error('headless not started')
+    const gid = guildId || this.platform.guild?.guild?.id
+    if (!gid) throw new Error('no guild')
+    const path = require('bare-path')
+    const {
+      listMeshStabilityUiDiagnosticsActionsFieldKeys,
+      buildMeshStabilityDiagnosticsActionsSnapshot
+    } = require('pearcord-platform/mesh-stability-ui-diagnostics-actions-keys')
+    const uiPath = path.join(__dirname, '..', '..', 'apps', 'pearcord', 'ui', 'mesh-stability-ui-diagnostics-actions.js')
+    const { buildMeshStabilityDiagnosticsActionsEmbedHtml } = await import(uiPath)
+    const view = await this.refreshView()
+    const fields = listMeshStabilityUiDiagnosticsActionsFieldKeys()
+    const snapshot = buildMeshStabilityDiagnosticsActionsSnapshot({
+      ...view,
+      guildSyncHealth: view.guildSyncHealth || { peers: 1 }
+    })
+    const embedHtml = buildMeshStabilityDiagnosticsActionsEmbedHtml({
+      guildSyncHealth: { peers: 1 }
+    })
+    return { guildId: gid, fields, snapshot, embedHtml, view }
+  }
+
   /** Journey stub: mesh stability UI mesh stats tail keys + embed snapshot (Phase 1002). */
   async runMeshStabilityUiMeshStatsTailJourney (guildId) {
     if (!this.platform) throw new Error('headless not started')