Show workflows in the subagent track (#2933)

* feat(server): show provider workflows in subagent track

Normalize workflow tasks into the provider-subagent contract so shared clients need no workflow awareness. Persisted nonterminal runs replay as failed because their original runtime can no longer deliver a terminal update.

* fix(server): preserve workflow replay and tool cards

* fix(server): suppress workflow notification cards

* fix(server): replay workflow child timelines

* fix(server): fail tasks when Claude exits

* fix(server): preserve workflow replay parity

* fix(server): fail tasks on Claude restart

* fix(server): hide workflow child prompts on replay

* fix: terminalize workflows on session reload

* fix(server): own workflow notification routing

* feat(server): show workflow results in detail pane

* fix(server): preserve unrestored task notifications

* fix(server): normalize replay task notifications

docs/agent-lifecycle.md

@@ -140,7 +140,7 @@ Provider descriptors may include one compact subtitle. The provider owns its con
 
 Claude Code announces subagent lifecycle on the SDK stream (`task_started` / `task_updated` / `task_notification` / `task_progress`), and Paseo reads those announcements rather than reconstructing them from sidechain frames. The live source (`subagents/live-source.ts`) and the replay source (`subagents/replay-source.ts`) both translate into one observation vocabulary (`subagents/observation.ts`), so a fact is derived once for both paths instead of once per path. Gotchas that are not obvious from the SDK types:
 
-- **Not every announced task is a subagent.** A backgrounded shell announces as `task_type: "local_bash"` with a `tool_use_id` and no `subagent_type`; workflows announce as `local_workflow`; ambient housekeeping sets `skip_transcript`. Filtering on the presence of a `tool_use_id` alone puts `sleep 20` in the subagents track.
+- **Not every announced task belongs in the track.** Task subagents announce as `local_agent` and workflows as `local_workflow`; a backgrounded shell announces as `local_bash` with the same `tool_use_id` shape, and ambient housekeeping sets `skip_transcript`. The Claude provider normalizes a workflow to a generic provider-subagent descriptor titled `Workflow`, using Claude's summary as its description and timeline opener. Shared storage, protocol, and UI do not distinguish it from another provider subagent.
 - **A task that was never declared gets no descriptor, by any route.** Filtered tasks still emit `task_notification`s carrying a `tool_use_id`, and still emit frames carrying `parent_tool_use_id`. Attributing either produces a descriptor with no identity and a defaulted `running` status — a nameless row that never finishes. Status, presentation updates, and sidechain frames all route through the declaration table.
 - **Task ids are session-scoped, not turn-scoped.** Cancelling a turn must not clear the routing table: a backgrounded child settles after the interrupt and needs its descriptor to still exist. Cancellation instead terminalizes the declared children that were running in the foreground, and a later `task_notification` is free to correct that guess. Backgrounded children are identified by `task_updated.patch.is_backgrounded`.
 - **Effort is only reachable through hooks.** It appears nowhere on the message stream at any depth, and the level Paseo requests is not necessarily the level that runs — a model that does not support it is silently downgraded. A hook firing inside a subagent reports the active post-downgrade level next to its `agent_id`, which is the same id `task_started` calls `task_id`.