0.22.0 — full MCP agent surface: 19 new tools, async run, session reliability

Stage 1 — Foundation:
- Target validation: iptables + systemctl/docker target-type gates
- Async run for long-running commands (sleep/wait/poll loops)
- audit_log.session_id plumbing (SQL, sqlcgen, 18 call sites)

Stage 2 — External agent observe (11 tools):
- get_dashboard_summary, get_ontology, list_checks, list_executions
- get_knowledge_revisions, get_knowledge_duplicates, get_knowledge_orphans
- list_knowledge_tags, list_entity_sessions, find_entities_by
- 3 resource templates: oikos://entity/{slug}, knowledge/{id}, execution/{id}

Stage 3 — Nomos reliability:
- complete_task(success) refused without verification (upgraded from warn)
- sessionHasPlan excludes replaced steps (forces propose_plan after reopen)
- Bash syntax validation in run() (rejects literal \n, flag-space typos)
- Scope gate in SOUL.md (ask before pivoting to unrelated subsystem)

Stage 4 — External agent act (9 mutation tools):
- ack_signal, resolve_signal, mute_signal, cancel_execution
- update_check, delete_knowledge, restore_knowledge
- merge_knowledge, rename_knowledge_tag

internal/httpapi/approval_rules.go

@@ -89,6 +89,7 @@ func (s *Server) CreateApprovalRule(ctx context.Context, req gen.CreateApprovalR
 	actorType, actor := actorInfo(ctx)
 	if auditErr := observability.Audit(ctx, sqlcgen.New(tx), actorType, actor, "create",
 		&id, "POST", "/api/v1/policy/approval-rules", "",
+		nil,
 		map[string]any{"action": req.Body.Action, "risk_class": req.Body.RiskClass}); auditErr != nil {
 		return nil, auditErr
 	}
@@ -148,6 +149,7 @@ func (s *Server) PatchApprovalRule(ctx context.Context, req gen.PatchApprovalRul
 	actorType, actor := actorInfo(ctx)
 	if auditErr := observability.Audit(ctx, sqlcgen.New(tx), actorType, actor, "patch",
 		&id, "PATCH", "/api/v1/policy/approval-rules/"+req.Id, "",
+		nil,
 		map[string]any{"action": req.Body.Action}); auditErr != nil {
 		return nil, auditErr
 	}