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>

internal/config/schema.go

@@ -10,12 +10,9 @@ type AgentConfig struct {
 	LLM         LLMCfg         `yaml:"llm"`
 	Tools       ToolsCfg       `yaml:"tools"`
 	Matrix      MatrixCfg      `yaml:"matrix"`
-	Agents      AgentsCfg      `yaml:"agents"`
 	SSH         SSHCfg         `yaml:"ssh"`
 	Security    SecurityCfg    `yaml:"security"`
 	Schedules   []ScheduleCfg  `yaml:"schedules"`
-	Observability ObservabilityCfg `yaml:"observability"`
-	Resilience  ResilienceCfg  `yaml:"resilience"`
 	Storage     StorageCfg     `yaml:"storage"`
 	Memory      MemoryCfg      `yaml:"memory"`
 	Skills      SkillsCfg      `yaml:"skills"`
@@ -276,34 +273,6 @@ type FiltersCfg struct {
 	MinPowerLevel        int      `yaml:"min_power_level"`
 }
 
-// ── Inter-agent ───────────────────────────────────────────────────────────
-
-type AgentsCfg struct {
-	Peers      []PeerCfg      `yaml:"peers"`
-	Delegation DelegationCfg  `yaml:"delegation"`
-	Protocol   ProtocolCfg    `yaml:"protocol"`
-}
-
-type PeerCfg struct {
-	ID           string   `yaml:"id"`
-	Capabilities []string `yaml:"capabilities"`
-	Room         string   `yaml:"room"`
-}
-
-type DelegationCfg struct {
-	Enabled          bool          `yaml:"enabled"`
-	CanDelegateTo    []string      `yaml:"can_delegate_to"`
-	CanReceiveFrom   []string      `yaml:"can_receive_from"`
-	MaxDepth         int           `yaml:"max_delegation_depth"`
-	Timeout          time.Duration `yaml:"timeout"`
-}
-
-type ProtocolCfg struct {
-	Format            string        `yaml:"format"`  // json | protobuf | msgpack
-	Channel           string        `yaml:"channel"` // matrix | grpc | channel
-	HeartbeatInterval time.Duration `yaml:"heartbeat_interval"`
-}
-
 // ── SSH Inventory ─────────────────────────────────────────────────────────
 
 type SSHCfg struct {
@@ -398,76 +367,6 @@ type FailureAction struct {
 	EscalateTo  string `yaml:"escalate_to"`
 }
 
-// ── Observability ─────────────────────────────────────────────────────────
-
-type ObservabilityCfg struct {
-	Logging  LoggingCfg  `yaml:"logging"`
-	Metrics  MetricsCfg  `yaml:"metrics"`
-	Health   HealthCfg   `yaml:"health"`
-	Tracing  TracingCfg  `yaml:"tracing"`
-}
-
-type LoggingCfg struct {
-	Level  string `yaml:"level"`
-	Format string `yaml:"format"` // json | text
-	Output string `yaml:"output"` // stdout | file
-	File   string `yaml:"file"`
-}
-
-type MetricsCfg struct {
-	Enabled bool   `yaml:"enabled"`
-	Port    int    `yaml:"port"`
-	Path    string `yaml:"path"`
-	Export  string `yaml:"export"` // prometheus
-}
-
-type HealthCfg struct {
-	Enabled bool   `yaml:"enabled"`
-	Port    int    `yaml:"port"`
-	Path    string `yaml:"path"`
-}
-
-type TracingCfg struct {
-	Enabled  bool   `yaml:"enabled"`
-	Provider string `yaml:"provider"`
-	Endpoint string `yaml:"endpoint"`
-}
-
-// ── Resilience ────────────────────────────────────────────────────────────
-
-type ResilienceCfg struct {
-	CircuitBreaker CircuitBreakerCfg `yaml:"circuit_breaker"`
-	Retry          RetryCfg          `yaml:"retry"`
-	Shutdown       ShutdownCfg       `yaml:"shutdown"`
-	Queue          QueueCfg          `yaml:"queue"`
-}
-
-type CircuitBreakerCfg struct {
-	FailureThreshold int           `yaml:"failure_threshold"`
-	Timeout          time.Duration `yaml:"timeout"`
-	HalfOpenMax      int           `yaml:"half_open_max"`
-}
-
-type RetryCfg struct {
-	MaxAttempts  int           `yaml:"max_attempts"`
-	Backoff      string        `yaml:"backoff"` // fixed | exponential
-	InitialDelay time.Duration `yaml:"initial_delay"`
-	MaxDelay     time.Duration `yaml:"max_delay"`
-}
-
-type ShutdownCfg struct {
-	Timeout     time.Duration `yaml:"timeout"`
-	DrainMessages bool        `yaml:"drain_messages"`
-	SaveState   bool          `yaml:"save_state"`
-	StateFile   string        `yaml:"state_file"`
-}
-
-type QueueCfg struct {
-	Enabled       bool     `yaml:"enabled"`
-	MaxSize       int      `yaml:"max_size"`
-	PriorityUsers []string `yaml:"priority_users"`
-}
-
 // ── Storage ───────────────────────────────────────────────────────────────
 
 type StorageCfg struct {