session reliability: reconnect, knowledge loop, retire request_execution

Phase 1 — crash recovery: SSE auto-reconnect + backoff, polling gate
during disconnect, connection banner with retry button, empty-response
retry 3x, non-terminal resume on empty response, persistent error cards.

Phase 2/4 — visibility + continuation: custom ExecutionStatus renderer,
approvals extracted on every tool_result (not just done), activity bar
with status/goal, SessionDigest live polling, Continue button.

Phase 3 — cleanup: complete_task auto-cancels orphaned approvals,
deletes assent/destructive window keys, propose_plan marks pending
steps as replaced, plan step seq-order enforcement.

Phase 5 — knowledge loop: list_lxcs state filter (active/destroyed),
SOUL.md unmissable writeback section, propose_plan validation nudge,
complete_task writeback check, upsert_knowledge about array support,
plan generation grouping in frontend, session approval count badge.

Retire request_execution — all mutations now route through run.
Updated SOUL.md, AGENTS.md, CLIENTS.md, skills, and agent system notes.

Migration 020: plan step generation column, audit_log session_id index,
nomos_plan_executions pending-approval index.

web/src/lib/components/SessionDigest.svelte

@@ -16,18 +16,27 @@
   // still refetch once outcome/summary land, not just on session switch.
   let loadedKey = $state<string | null>(null)
 
-  // Reload the digest whenever the session changes, the task's status changes
-  // (e.g. it just completed), or a stream finishes — "what did this session
-  // actually do" is only meaningful once executions have had a chance to land.
+  let pollTimer: ReturnType<typeof setInterval> | null = $state(null)
+
   $effect(() => {
     const sid = $currentSession
     const busy = $streaming
     const status = $currentTask?.status ?? ''
     if (!sid || busy) return
     const key = `${sid}:${status}`
-    if (loadedKey === key) return
-    loadedKey = key
-    fetchSessionDigest(sid).then((d) => (digest = d))
+    if (loadedKey !== key) {
+      loadedKey = key
+      fetchSessionDigest(sid).then((d) => (digest = d))
+    }
+    // Poll every 10s while the session is active.
+    if (status !== 'done' && status !== 'failed') {
+      if (!pollTimer) pollTimer = setInterval(() => fetchSessionDigest(sid).then((d) => (digest = d)), 10000)
+    } else {
+      if (pollTimer) { clearInterval(pollTimer); pollTimer = null }
+    }
+    return () => {
+      if (pollTimer) { clearInterval(pollTimer); pollTimer = null }
+    }
   })
 
   function statusVariant(status: string): 'default' | 'secondary' | 'destructive' | 'outline' {