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/api.ts

@@ -20,6 +20,7 @@ export interface Session {
   outcome?: string // success | failure | partial
   summary?: string
   entity_id?: string
+  pending_approvals?: number
   created_at: string
   last_active_at: string
 }
@@ -51,12 +52,18 @@ export async function deleteSession(sessionId: string): Promise<boolean> {
   return res.ok
 }
 
+export async function resumeSession(sessionId: string): Promise<boolean> {
+  const res = await fetchWithAuth(`${BASE}/sessions/${sessionId}/resume`, { method: 'POST' })
+  return res.ok
+}
+
 export interface PlanStep {
   id: string
   seq: number
   title: string
   detail: string
-  status: 'pending' | 'running' | 'done' | 'failed' | 'skipped' | 'blocked'
+  status: 'pending' | 'running' | 'done' | 'failed' | 'skipped' | 'blocked' | 'replaced'
+  generation?: number
   execution_id?: string
   target_slug?: string
   started_at?: string