feat: no-answer retry, agent status machine, escalation events/timeline (ТЗ §13-15,22,25-27,37, AC-08,16-19)

Phase 2 of the L1->L2 routing engine (Phase 1: MR!4).

- ami_loop() now also captures native AMI DialEnd/Hangup frames (not
  only UserEvent), needed to detect that an escalated agent did not
  answer. No dialplan change required - Redirect already routes the
  client channel into an existing Dial()-based transfer context, so
  Asterisk emits these events on its own; the listener just wasn't
  reading them before.
- retry_escalation_no_answer(): on NOANSWER/BUSY/CANCEL/CHANUNAVAIL/
  CONGESTION, releases the non-answering agent, excludes it, and
  reserves+redirects to the next available agent via the routing
  engine's existing exclude_agent_ids support. Exhausted pool marks
  the escalation failed and leaves the call with the AI instead of
  dropping the client (ТЗ §32).
- Agent status now actually moves through
  RESERVED -> RINGING -> TALKING -> AFTER_CALL_WORK -> AVAILABLE
  instead of staying stuck on RESERVED for the whole call; a new
  acw_sweep_loop background thread (same pattern as the existing
  failed_retry_loop) times out AFTER_CALL_WORK back to AVAILABLE.
- escalations gains attempt_count/real_agent_id/attempted_agent_ids_json
  (migration 0033); fixes a latent bug where assigned_agent_id stored
  the SIP extension instead of the real agent_id despite routing-service
  already returning it in RoutingAgentReserveOut.
- Every transition now records an interaction timeline entry and
  publishes the ТЗ §25 event catalog (AgentReserved/AgentRinging/
  AgentNoAnswer/AgentConnected/TransferCompleted/TransferFailed)
  through the existing emit_voice_event/EventOutboxRow idempotent path.

Not in this MR (see plan): SLA config, Callback, L3 (needs real
technical agents from the business), metrics.

services/asterisk_bridge_service/app.py

@@ -262,6 +262,7 @@ def _start_background_threads() -> None:
         extra_loops: list[tuple[str, Callable[..., Any]]] = []
         if _ivr_fastagi_enabled():
             extra_loops.append(("asterisk-ivr-fastagi-loop", _ivr_fastagi_loop))
+        extra_loops.append(("agent-acw-sweep-loop", _acw_sweep_loop))
         bridge_runtime.start_background_threads(
             ami_loop=_ami_loop,
             failed_retry_loop=_failed_retry_loop,
@@ -305,6 +306,9 @@ _update_voice_ai_call_state = bridge_voice_ai.update_call_ai_state
 _voice_ai_summary_for_call = bridge_voice_ai.voice_ai_summary_for_call
 _create_escalation = bridge_voice_ai.create_escalation
 _release_routing_agent = bridge_voice_ai.release_routing_agent
+_retry_escalation_no_answer = bridge_voice_ai.retry_escalation_no_answer
+_routing_release_by_agent_id = bridge_voice_ai.routing_release_by_agent_id
+_set_routing_agent_status = bridge_voice_ai.set_routing_agent_status
 
 _first_non_empty = bridge_ami.first_non_empty
 _extract_call_id = bridge_ami.extract_call_id
@@ -373,6 +377,8 @@ _process_audio_bridge_ended = bridge_processing.process_audio_bridge_ended
 _process_call_ended = bridge_processing.process_call_ended
 _process_operator_connected = bridge_processing.process_operator_connected
 _process_recording_ready = bridge_processing.process_recording_ready
+_process_agent_dial_outcome = bridge_processing.process_agent_dial_outcome
+_acw_sweep_loop = bridge_processing.acw_sweep_loop
 _process_bridge_row = bridge_processing.process_bridge_row
 _record_ami_payload = bridge_processing.record_ami_payload
 _retry_failed_events_once = bridge_processing.retry_failed_events_once