refactor: eliminar structs muertos del config schema

Elimina 14 structs nunca referenciados en el codebase:
- ObservabilityCfg y sub-structs (LoggingCfg, MetricsCfg, HealthCfg, TracingCfg)
- ResilienceCfg y sub-structs (CircuitBreakerCfg, RetryCfg, ShutdownCfg, QueueCfg)
- AgentsCfg y sub-structs (PeerCfg, DelegationCfg, ProtocolCfg)

Se eliminan los campos Agents, Observability y Resilience del AgentConfig root.
CommunicationCfg se mantiene porque esta activamente usada por pkg/personality/
y agents/commands.go.

schema.go pasa de 561 lineas / 61 structs a 460 lineas / 47 structs.
El template _template/config.yaml se reduce de 414 a ~220 lineas.
Los configs de assistant-bot y asistente-2 se limpian de secciones muertas.

yaml.v3 ignora campos extra, asi que YAMLs antiguos siguen parseando sin error.

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

agents/asistente-2/config.yaml

@@ -175,27 +175,6 @@ matrix:
     enabled: true                # responder en threads cuando el mensaje viene de un thread
     auto_thread: false           # true para crear thread automático por cada conversación nueva
 
-# ============================================
-# COMUNICACIÓN INTER-AGENTES
-# ============================================
-agents:
-  peers:
-    - id: assistant-bot
-      capabilities: [general, llm]
-      room: ""
-
-  delegation:
-    enabled: false
-    can_delegate_to: []
-    can_receive_from: [assistant-bot]
-    max_delegation_depth: 1
-    timeout: 30s
-
-  protocol:
-    format: json
-    channel: matrix
-    heartbeat_interval: 60s
-
 # ============================================
 # SSH — no aplica para este bot
 # ============================================
@@ -228,72 +207,7 @@ security:
 schedules: []
 
 # ============================================
-# OBSERVABILIDAD
-# ============================================
-observability:
-  logging:
-    level: info
-    format: json
-    output: stdout
-    file: "./agents/asistente-2/data/asistente-2.log"
-
-  metrics:
-    enabled: false
-    port: 9092
-    path: /metrics
-    export: prometheus
-
-  health:
-    enabled: true
-    port: 8082
-    path: /healthz
-
-  tracing:
-    enabled: false
-    provider: ""
-    endpoint: ""
-
-# ============================================
-# RESILIENCIA
-# ============================================
-resilience:
-  circuit_breaker:
-    failure_threshold: 5
-    timeout: 30s
-    half_open_max: 2
-
-  retry:
-    max_attempts: 2
-    backoff: exponential
-    initial_delay: 1s
-    max_delay: 10s
-
-  shutdown:
-    timeout: 10s
-    drain_messages: true
-    save_state: false
-    state_file: ""
-
-  queue:
-    enabled: true
-    max_size: 100
-    priority_users: ["@admin:matrix-af2f3d.organic-machine.com"]
-
-# ============================================
-# ALMACENAMIENTO Y ESTADO
+# STORAGE
 # ============================================
 storage:
-  state:
-    backend: sqlite
-    path: "./agents/asistente-2/data/asistente-2.db"
-
-  cache:
-    enabled: true
-    backend: memory
-    ttl: 5m
-    max_entries: 200
-
-  history:
-    backend: sqlite
-    path: "./agents/asistente-2/data/history.db"
-    retention: 168h   # 7 días
+  base_path: ""