feat: sistema de personalidades enriquecido + agente template

Fase 1: Sistema de personalidades enriquecido
- Ampliar PersonalityCfg con role, backstory, expertise, limitations
- Añadir CommunicationCfg (formality, humor, personality, response_style, quirks, catchphrases)
- Crear tipos puros en pkg/personality/traits.go
- Implementar BuildPersonalityPrompt() para generar bloque de system prompt
- Integrar personalidad en agents/runtime.go (FromConfig + concatenacion al system prompt)

Fase 2: Agente plantilla
- Añadir campo Template bool a AgentMeta
- Filtrar agentes template en launcher (skip si template: true)
- Crear agents/_template/ con config.yaml completo y documentado
- Incluir TODAS las secciones (skills, shared_knowledge, schedules, security)
- agent.go minimo + prompts/system.md plantilla
- Actualizar dev-scripts/agent/new-agent.sh para copiar desde _template/

Fase 3: Ejemplos de personalidades
- Crear agents/_template/PERSONALITIES.md con 4 perfiles:
  * DevOps pragmatico
  * Analista meticuloso
  * Asistente amigable
  * Guardian de seguridad

🤖 Generated with [Claude Code](https://claude.com/claude-code)

Co-Authored-By: Claude <noreply@anthropic.com>

pkg/personality/convert.go

@@ -0,0 +1,47 @@
+package personality
+
+import "github.com/enmanuel/agents/internal/config"
+
+// FromConfig convierte PersonalityCfg (config) a Personality (tipo puro).
+// Esta funcion es pura: no tiene side effects.
+func FromConfig(cfg config.PersonalityCfg) Personality {
+	return Personality{
+		Tone:               Tone(cfg.Tone),
+		Verbosity:          Verbosity(cfg.Verbosity),
+		Language:           cfg.Language,
+		LanguagesSupported: cfg.LanguagesSupported,
+		EmojiStyle:         EmojiStyle(cfg.EmojiStyle),
+		Prefix:             cfg.Prefix,
+		ErrorStyle:         ErrorStyle(cfg.ErrorStyle),
+		Templates: Templates{
+			Greeting:         cfg.Templates.Greeting,
+			UnknownCommand:   cfg.Templates.UnknownCommand,
+			PermissionDenied: cfg.Templates.PermissionDenied,
+			Error:            cfg.Templates.Error,
+			Success:          cfg.Templates.Success,
+			Busy:             cfg.Templates.Busy,
+		},
+		Behavior: Behavior{
+			Proactive:          cfg.Behavior.Proactive,
+			AskConfirmation:    cfg.Behavior.AskConfirmation,
+			ShowReasoning:      cfg.Behavior.ShowReasoning,
+			ThreadReplies:      cfg.Behavior.ThreadReplies,
+			TypingIndicator:    cfg.Behavior.TypingIndicator,
+			AcknowledgeReceipt: cfg.Behavior.AcknowledgeReceipt,
+		},
+		Role:        cfg.Role,
+		Backstory:   cfg.Backstory,
+		Expertise:   cfg.Expertise,
+		Limitations: cfg.Limitations,
+		Communication: Communication{
+			Formality:     Formality(cfg.Communication.Formality),
+			Humor:         Humor(cfg.Communication.Humor),
+			Personality:   PersonalityType(cfg.Communication.Personality),
+			ResponseStyle: ResponseStyle(cfg.Communication.ResponseStyle),
+			Quirks:        cfg.Communication.Quirks,
+			AvoidTopics:   cfg.Communication.AvoidTopics,
+			Catchphrases:  cfg.Communication.Catchphrases,
+		},
+		CustomDirectives: cfg.CustomDirectives,
+	}
+}