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>

cloud-console/src/types.ts

@@ -17,6 +17,10 @@ export interface TaskListItem {
   target_host_id: string | null;
   target_device_id: string | null;
   created_at: string;
+  progress_step_index?: number | null;
+  progress_step_status?: string | null;
+  progress_summary?: string | null;
+  progress_updated_at?: string | null;
 }
 
 export interface TaskSubmissionPayload {
@@ -178,3 +182,17 @@ export interface LlmProviderProfileListResponse {
   settings: LlmProviderSettings;
   items: LlmProviderProfile[];
 }
+
+export interface PlannerDecisionItem {
+  step_index: number;
+  attempt: number;
+  system_prompt: string;
+  user_prompt: string;
+  tool_name: string;
+  arguments: Record<string, unknown>;
+  created_at: string;
+}
+
+export interface PlannerDecisionListResponse {
+  items: PlannerDecisionItem[];
+}