## Why

Nobody can see a task while it is running. Host Agent's local console only shows a coarse "current assignment" snapshot (task id, device id, goal, started-at) because the `TaskRunner` it drives is wired with `metadata_store=None, timeline=None` — every step transition happens in memory and is discarded the instant the assignment finishes. Cloud Control Plane only learns about an assignment at claim, heartbeat, and terminal-result time, so Cloud Console has nothing better to show. The local Runtime (`api/rest.py` + `console/`) is a separate process with its own independent `TaskMetadataStore`/`Timeline`, so it never sees a task that a Host Agent executed at all. An operator debugging a stuck or misbehaving task currently has no live signal anywhere in the system until the task finishes or times out.

## What Changes

- Wire Host Agent's `AssignmentExecutor` / `create_execution_factories()` with a real `metadata_store` and `timeline` (or Host-Agent-local equivalents) so the in-process `TaskRunner` actually records step-by-step status instead of discarding it.
- Expose that step-level detail through Host Agent's local console: extend `AgentStatusTracker`/`/api/status` (or add a focused endpoint) with current step index, step status, and a short in-progress step log; render it in the dashboard's "Current assignment" section instead of the static started-at-only view.
- Add a progress-reporting path from Host Agent to Cloud Control Plane so the control plane learns step-level state near-real-time rather than only at claim/heartbeat/terminal-result. Extend the existing `cloud.internal_api.models` Pydantic schema (the single source of truth Host Agent already imports directly) rather than introducing a parallel schema.
- Persist and expose the latest per-assignment progress on the Cloud Control Plane side, and surface it in Cloud Console so an operator watching a remote task sees live step progress, not just "dispatched" / "succeeded" / "failed".
- Give an operator a web console view of Host-Agent-executed task progress without making the `runtime/`-owned packages import host or cloud concerns (enforced by `test_runtime_owned_packages_do_not_import_host_or_cloud_concerns`). After evaluating the alternative of making the Runtime `console/` SPA multi-backend (pointing its existing JS bundle at a Host Agent's console origin), this change instead extends Host Agent's own server-rendered local console with read-only task list/detail/timeline pages, reusing the same query shape `api/console.py` already exposes to the Runtime SPA. This avoids new cross-origin/session-cookie surface between the SPA and Host Agent, and keeps `runtime/` untouched. See design.md for the full trade-off analysis.
- All three surfaces continue to use polling (matching current behavior); this change does not introduce SSE/WebSocket infrastructure unless design.md finds a compelling reason to.
- Fix the shared `Timeline`/`TaskRunner`/`AIPlanner` recording path so a persisted step's "prompt" is the *actual* prompt sent to the LLM for that step (not the task's overall goal) and the model's resulting decision is captured too — this pre-existing gap affects Runtime and Host Agent alike and undermines the step-level detail this change otherwise adds.
- Persist a durable, per-step log of full LLM prompt/response content on the Cloud Control Plane, for centralized troubleshooting — reusing the already-existing `cloud-planner-proxy` decide endpoint as the capture point (no new protocol/endpoint) rather than the coarse lease-renewal piggyback used for live index/status. This durable log is populated only for hosts using the `cloud` planner transport; hosts on the `direct` transport still get only the coarse index/status via lease renewal. Cloud Console gains a view to browse a task's full LLM interaction history.

## Capabilities

### New Capabilities
- `host-agent-task-progress`: Host Agent captures step-level execution progress for its in-flight assignment (via a wired `metadata_store`/`timeline`) and exposes it through its local console/API.
- `cloud-task-progress-visibility`: Cloud Control Plane receives, persists, and exposes near-real-time step-level progress for assignments it has dispatched to a Host Agent, and Cloud Console renders it.
- `host-agent-console-task-pages`: Host Agent's local server-rendered console gains read-only task list/detail/timeline pages (mirroring `api/console.py`'s task query shape) so an operator can inspect a Host-Agent-executed task's progress and history without needing the separate Runtime `console/` SPA or violating the `runtime/`-package host/cloud isolation boundary.

### Modified Capabilities
- `host-agent-protocol`: add a requirement that the Host Agent reports in-progress step-level status updates to the control plane (in addition to the existing heartbeat/claim/renewal/result operations), and that the control plane accepts and stores them per active assignment.
- `cloud-planner-proxy`: the existing planner-decision endpoint additionally persists each resolved decision's prompt/response into a durable, bounded-retention per-step log, instead of discarding it after the response is returned.

## Impact

- `apps/device-host-agent/host_agent/app.py`, `execution.py`, `assignment.py`, `status.py`, `web/app.py` — wire a real metadata/timeline store into the in-process `TaskRunner`, extend status tracking and the local console UI/API.
- `runtime/task.py`, `runtime/ai_planner.py`, `runtime/tool_calling_client.py`, `storage/timeline.py` — fix the shared step-recording path so the real per-step prompt and the model's response are captured, not just the task goal and parsed tool call (a correctness fix in already-existing, shared code, not new behavior scope).
- `packages/cloud-platform/cloud/internal_api/models.py`, `packages/cloud-platform/cloud/internal_api/api.py` (`decide_planner_call`), `repository.py`/`sql_repository.py`, a new Alembic migration — new progress-reporting request/response models and a persistence + query path for latest per-assignment coarse progress, *and* a new durable per-step `planner_decision_log` table (with its own retention job) populated from the existing planner-decision endpoint.
- `cloud-console/` (Vue3 SPA) — new UI to render live per-assignment progress, and a new view to browse a task's full LLM interaction history.
- `apps/device-host-agent/host_agent/web/app.py` — new read-only task list/detail/timeline pages backed by the Host-Agent-local `TaskMetadataStore`/`Timeline`; no changes anticipated to `console/` (Vue3 SPA).
- No changes anticipated to `driver/`, `device/`, `core/` device-control internals.