feat: surface task execution progress across Host Agent and Cloud

Host Agent now persists step-level execution detail locally (via a real
TaskMetadataStore/Timeline wired into TaskRunner) and reports a bounded
in-progress snapshot piggybacked on lease renewal. Cloud persists that
snapshot per active assignment and exposes it through the existing task
list/detail query path; Cloud Console renders it as a live badge. Host
Agent's local console gains authenticated, read-only task list and
detail/timeline pages (same-origin, server-rendered) with inlined
screenshots.

Also fixes a pre-existing gap in the shared Timeline: the actual
per-step LLM prompt is now recorded instead of the task goal, benefiting
both Runtime and Host Agent consoles. When a host uses the cloud planner
transport, each decide call's prompt and resulting tool decision are
durably logged in a new planner_decision_log table (with bounded
retention) and browsable from Cloud Console; direct-transport hosts
explicitly surface a "not reported" state.

Includes Alembic migrations 0008 (progress columns on scheduled_tasks)
and 0009 (planner_decision_log), bounded Host-Agent-local retention,
dual-backend repository parity, and Vitest + pytest coverage. Task 6.5
(manual end-to-end device verification) remains.

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

apps/device-host-agent/host_agent/client.py

@@ -16,9 +16,13 @@ from cloud.internal_api.models import (
     HostEnrollmentResponse,
     HostTaskSubmissionResponse,
     LeaseRenewalResponse,
+    TaskProgressModel,
     TerminalResultResponse,
 )
 from host_agent.config import HostAgentConfig
+from host_agent.progress import TaskProgressSnapshot
+
+_VALID_STEP_STATUSES = frozenset({"running", "completed", "failed"})
 
 
 class HostAgentAPIError(RuntimeError):
@@ -194,19 +198,33 @@ class HostAgentClient:
     async def renew(
         self,
         assignment: AssignmentModel,
+        *,
+        progress: TaskProgressSnapshot | None = None,
     ) -> LeaseRenewalResponse:
+        payload: dict[str, Any] = {
+            "host_id": self.config.host_id,
+            "task_id": assignment.task_id,
+            "attempt": assignment.attempt,
+            "lease_id": assignment.lease_id,
+        }
+        if progress is not None:
+            step_status = (
+                progress.step_status
+                if progress.step_status in _VALID_STEP_STATUSES
+                else "running"
+            )
+            payload["progress"] = TaskProgressModel(
+                step_index=max(progress.step_index, 0),
+                step_status=step_status,
+                summary=progress.summary[:500],
+            ).model_dump(mode="json")
         response = await self._request(
             "POST",
             (
                 f"/internal/v1/hosts/{self.config.host_id}/assignments/"
                 f"{assignment.task_id}/renew"
             ),
-            json={
-                "host_id": self.config.host_id,
-                "task_id": assignment.task_id,
-                "attempt": assignment.attempt,
-                "lease_id": assignment.lease_id,
-            },
+            json=payload,
         )
         return LeaseRenewalResponse.model_validate(response.json())