v0.116.0: observability pass — always-on debug ring + leveled sweep + agent tab + self-log pull — MinAgent: 0.81.0

Capture layer: LogBuffer always exists; logger = MultiWriter(LevelFilterWriter
(stdout, logging.level), ring) so DEBUG detail exists remotely without a config
flip while docker logs keep respecting the level. New internal/logx leveled
helpers. Report ACK gains controller_log_requested (additive); next report
ships controller_log_tail (128KB, consume-once, app-tail wire byte-compatible).
Debug page: Vezérlő|Ügynök tabs; agent tab proxies agent /debug/logs with the
pre-0.83 notice on typed 404. Sweep: netstorage_job phases, netprobe, handler
validation refusals + orphan WARN, SupportsWithSource gate line, agentapi
per-call DEBUG, migrate phase lines, tier2/offbox unswallowed persists.
Red-proofs: filter-disabled, drain-removed, dropped-phase-line all FAIL.

Co-Authored-By: Claude Fable 5 <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_01PSK5g6qYLknKj8u3QAFEr6

controller/internal/web/agent_disk_handlers.go

@@ -58,6 +58,10 @@ func (s *Server) agentClient() (*agentapi.Client, error) {
 	s.agentCliOnce.Do(func() {
 		s.agentCli, s.agentCliErr = agentapi.New(
 			s.cfg.LocalAPI.Endpoint, s.cfg.LocalAPI.Token, s.cfg.LocalAPI.Fingerprint)
+		if s.agentCliErr == nil {
+			// v0.116.0: per-call DEBUG traces into the capture ring (method/path/status/duration).
+			s.agentCli.SetLogger(s.logger)
+		}
 	})
 	return s.agentCli, s.agentCliErr
 }