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>

packages/cloud-platform/cloud/sdk/models.py

@@ -37,6 +37,10 @@ class TaskStatusResponse(BaseModel):
     failure_reason: str | None = None
     target_host_id: str | None = None
     target_device_id: str | None = None
+    progress_step_index: int | None = None
+    progress_step_status: str | None = None
+    progress_summary: str | None = None
+    progress_updated_at: datetime | None = None
 
 
 class TaskListItem(BaseModel):
@@ -51,6 +55,10 @@ class TaskListItem(BaseModel):
     target_host_id: str | None = None
     target_device_id: str | None = None
     created_at: datetime
+    progress_step_index: int | None = None
+    progress_step_status: str | None = None
+    progress_summary: str | None = None
+    progress_updated_at: datetime | None = None
 
 
 class TaskListResponse(BaseModel):
@@ -263,3 +271,17 @@ class LlmProviderSettingsResponse(BaseModel):
 class LlmProviderProfileListResponse(BaseModel):
     settings: LlmProviderSettingsResponse
     items: list[LlmProviderProfileResponse]
+
+
+class TaskPlannerDecisionItem(BaseModel):
+    step_index: int
+    attempt: int
+    system_prompt: str
+    user_prompt: str
+    tool_name: str
+    arguments: dict[str, Any] = Field(default_factory=dict)
+    created_at: datetime
+
+
+class TaskPlannerDecisionListResponse(BaseModel):
+    items: list[TaskPlannerDecisionItem]