Self-heal tribunal rooms with no work_dir so the owner never goes silent

A tribunal room whose work_dir was never provisioned (null) made
resolveOwnerTaskForHumanMessage return a null task, so the owner never ran and
the room went completely silent — the user's messages got no reply at all (seen
in the tts_site room, where days of requests were dropped). ensurePairedProject
now provisions the canonical workspace on demand when work_dir is missing,
guarded to tribunal rooms so a single-mode room never gets a spurious paired
workspace. Idempotent via ensurePairedWorkspaceProvisioned. Adds tests for both
the tribunal self-heal and the single-mode no-op.

Co-Authored-By: Claude Opus 4.7 <noreply@anthropic.com>

src/paired-execution-context.ts

@@ -19,6 +19,7 @@ import {
 import {
   cancelPairedTurn,
   createPairedTask,
+  getEffectiveRuntimeRoomMode,
   getLatestPairedTaskForChat,
   getLatestOpenPairedTaskForChat,
   getPairedTaskById,
@@ -48,6 +49,7 @@ import {
 } from './paired-task-status.js';
 import { resolveCanonicalSourceRef } from './paired-source-ref.js';
 import {
+  ensurePairedWorkspaceProvisioned,
   isOwnerWorkspaceRepairNeededError,
   prepareReviewerWorkspaceForExecution,
   provisionOwnerWorkspaceForPairedTask,
@@ -74,7 +76,21 @@ function ensurePairedProject(
   chatJid: string,
 ): string | null {
   if (!group.workDir) {
-    return null;
+    // Self-heal: a tribunal room whose work_dir was never provisioned (null)
+    // makes resolveOwnerTaskForHumanMessage return a null task, so the owner
+    // never runs and the room goes completely silent — the user's messages get
+    // no reply at all. Provision the canonical workspace on demand so the owner
+    // can always start. Guarded to tribunal rooms so a single-mode room never
+    // gets a spurious paired workspace. Idempotent: ensurePairedWorkspace-
+    // Provisioned skips git init/commit when they already exist and upserts the
+    // paired project itself.
+    if (getEffectiveRuntimeRoomMode(chatJid) !== 'tribunal') {
+      return null;
+    }
+    return ensurePairedWorkspaceProvisioned({
+      chatJid,
+      groupFolder: group.folder,
+    });
   }
 
   const now = new Date().toISOString();