feat(tasks): phase 6 — live TaskContextPanel (goal, plan, question, entities)

Replaces the chat right rail's ad-hoc Digest+Graph stack with a single
TaskContextPanel that renders the task's live working state, driven by the
always-on events stream (not the per-turn chat SSE) so it keeps updating
during server-side auto-continuation/resume:

- GoalHeader: goal + status pill (planning/executing/awaiting_input/done/
  failed), sourced from the sessions list.
- PlanProgress: ordered steps with live status icons + progress bar, hydrated
  via new GET /sessions/{id}/plan; clicking a step with a target opens its
  EntitySheet (no fake "jump to transcript" — bits-ui Collapsible content
  isn't force-mounted, so a DOM-scroll jump would silently no-op for
  collapsed tool groups).
- OperatorQuestion: the pinned structured question card (prompt/why/entity
  chips/option buttons/free-text), hydrated via new GET /sessions/{id}/
  questions; answering POSTs to the existing answer endpoint.
- SessionGraph upgraded to a live entity panel: entity.touched pulses the
  node (animated ring) and shows "Now touching <slug>"; health.changed shows
  a transient diff badge for touched entities.
- SessionDigest gains a success/failure/partial outcome banner and now also
  refetches when the task's status changes, not just on session switch.

Two bugs found and fixed while wiring this up:
- workspace.ts's status-refresh trigger only covered goal.set/task.status;
  question.raised/answered didn't refresh the sessions list, so GoalHeader's
  pill went stale after answering via the panel (resumeSession runs entirely
  server-side — no client 'done' event to piggyback a refresh on). Now every
  status-affecting event triggers the (debounced) refetch.
- Forgot to rebuild the nomos container after adding the /plan and
  /questions endpoints, so they silently fell through to the old default GET
  handler — caught via a live curl diff against the running container,
  not a code read.

Verified end-to-end against the live stack: goal/plan/question all update
without a reload as the agent works; answering a question via the panel
resumes the agent and the header pill correctly flips to Executing;
entity.touched pulses the live graph.

Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>

web/src/lib/components/TaskContextPanel.svelte

@@ -0,0 +1,29 @@
+<script lang="ts">
+  import { onMount } from 'svelte'
+  import { startWorkspace } from '$lib/stores/workspace'
+  import GoalHeader from './GoalHeader.svelte'
+  import PlanProgress from './PlanProgress.svelte'
+  import OperatorQuestion from './OperatorQuestion.svelte'
+  import SessionGraph from './SessionGraph.svelte'
+  import SessionDigest from './SessionDigest.svelte'
+
+  onMount(() => startWorkspace())
+</script>
+
+<!--
+  The task's live control panel: goal + status, plan progress, a pinned
+  question when the agent needs a decision, the live entity graph (pulses what
+  the agent is touching, flags health changes), and the outcome/knowledge
+  record once the task completes. Driven by the always-on events stream
+  (see workspace.ts) so it keeps updating during server-side auto-continuation,
+  not just while a chat turn is streaming.
+-->
+<div class="flex h-full min-h-0 flex-col">
+  <GoalHeader />
+  <PlanProgress />
+  <OperatorQuestion />
+  <div class="min-h-0 flex-1">
+    <SessionGraph />
+  </div>
+  <SessionDigest />
+</div>