fix: read the real commit key (hash) and audit the restore-unblock path

- The auto-pause checkpoint and _extract_first_commit_sha read commit dicts by
  key 'sha', but persisted commits are keyed 'hash' (CommitRef.hash) — the prior
  change stopped the crash but silently dropped every ref. Read 'hash' (sha
  fallback) at both sites; the test now uses the production dict shape so the
  regression can't hide.
- unblock_with_restore set status directly and skipped the audit log; emit the
  status-transition audit there too, like the other direct-set paths.

roboco/services/gateway/choreographer/_impl.py

@@ -1503,14 +1503,14 @@ class Choreographer:
 
     @staticmethod
     def _extract_first_commit_sha(t: Any) -> str | None:
-        """Read the first commit sha off the task, dict or model alike."""
+        """Read the first commit hash off the task, dict or model alike."""
         commits: list[Any] = list(getattr(t, "commits", []) or [])
         if not commits:
             return None
         first = commits[0]
         if isinstance(first, dict):
-            return first.get("sha")
-        return getattr(first, "sha", None)
+            return first.get("hash") or first.get("sha")
+        return getattr(first, "hash", None) or getattr(first, "sha", None)
 
     @staticmethod
     def _already_addressed_criteria(existing_status: list[dict[str, Any]]) -> set[str]:
@@ -2710,9 +2710,12 @@ class Choreographer:
         try:
             commits = task.commits or []
             # commits may be hydrated as CommitRef objects or as plain dicts
-            # (JSON column round-trip); tolerate both rather than assuming `.sha`.
+            # (JSON column round-trip); the identifier field is `hash` (a stray
+            # `sha` only ever appears on a gateway return value, never persisted).
             commit_refs = [
-                c.get("sha") if isinstance(c, dict) else getattr(c, "sha", None)
+                (c.get("hash") or c.get("sha"))
+                if isinstance(c, dict)
+                else (getattr(c, "hash", None) or getattr(c, "sha", None))
                 for c in commits[-3:]
             ]
             commit_refs = [ref for ref in commit_refs if ref]

roboco/services/task.py

@@ -5643,6 +5643,12 @@ class TaskService(BaseService):
         except ValueError:
             return await self.unblock(task_id, agent_role="cell_pm")
 
+        pre_status = (
+            task.status.value
+            if isinstance(task.status, TaskStatus)
+            else str(task.status)
+        )
+        restored_owner = cast("Any", task.pre_block_assignee or task.claimed_by)
         task.status = restored_status
         if task.pre_block_assignee:
             task.assigned_to = cast("Any", task.pre_block_assignee)
@@ -5653,6 +5659,16 @@ class TaskService(BaseService):
         task.blocker_resolver_type = None
         task.blocker_raised_by = None
         await self.session.flush()
+        # This restore path sets the status directly (bypassing the strict
+        # transition validator), so emit the audit explicitly — no status
+        # change may skip the audit log.
+        self._emit_status_transition_audit(
+            task,
+            from_status=pre_status,
+            to_status=restored_status.value,
+            agent_role=None,
+            audit_agent_id=restored_owner,
+        )
         return task
 
     async def cell_pm_complete(