feat: integrar skills en runtime de agentes

Integrar sistema de skills en agents/runtime.go:

- Agregar skillLoader al struct Agent
- Inicializar loader y executor cuando skills.enabled = true
- Registrar skill tools en buildToolRegistry
- Respetar filtro de categorias configurado
- Aplicar timeout configurado para scripts

Las skills quedan disponibles automaticamente para agentes que
las habiliten en su config YAML.

Arquitectura: skills como extension opcional, no dependencia core.

agents/runtime.go

@@ -31,6 +31,7 @@ import (
 	"github.com/enmanuel/agents/shell/matrix"
 	shellmcp "github.com/enmanuel/agents/shell/mcp"
 	shellmem "github.com/enmanuel/agents/shell/memory"
+	shellskills "github.com/enmanuel/agents/shell/skills"
 	"github.com/enmanuel/agents/shell/ssh"
 	"github.com/enmanuel/agents/tools"
 	toolclock "github.com/enmanuel/agents/tools/clock"
@@ -40,6 +41,7 @@ import (
 	toolmatrix "github.com/enmanuel/agents/tools/matrix"
 	toolmcp "github.com/enmanuel/agents/tools/mcptools"
 	toolmemory "github.com/enmanuel/agents/tools/memorytools"
+	toolskills "github.com/enmanuel/agents/tools/skilltools"
 	toolssh "github.com/enmanuel/agents/tools/ssh"
 	toolweather "github.com/enmanuel/agents/tools/weather"
 )
@@ -95,6 +97,9 @@ type Agent struct {
 	// Shared knowledge store — non-nil when shared_knowledge is enabled
 	sharedKnowledgeStore *shellknowledge.FileStore
 
+	// Skills loader — non-nil when skills are enabled
+	skillLoader *shellskills.Loader
+
 	// Sanitization options — nil when sanitization is disabled
 	sanitizeOpts *sanitize.Options
 
@@ -277,8 +282,28 @@ func New(cfg *config.AgentConfig, rules []decision.Rule, agentACL acl.ACL, logge
 		}
 	}
 
+	// Skills loader
+	var skillLoader *shellskills.Loader
+	var skillExecutor *shellskills.Executor
+	if cfg.Skills.Enabled {
+		skillsPath := cfg.Skills.SkillsPath
+		if skillsPath == "" {
+			skillsPath = "skills/"
+		}
+		skillLoader = shellskills.NewLoader(skillsPath)
+
+		// Skills executor for scripts
+		allowedInterpreters := cfg.Tools.Skills.AllowedInterpreters
+		timeout := cfg.Skills.Timeout
+		if timeout == 0 {
+			timeout = 60 * time.Second
+		}
+		skillExecutor = shellskills.NewExecutor(allowedInterpreters, timeout)
+		logger.Info("skills enabled", "path", skillsPath, "categories", cfg.Skills.Categories)
+	}
+
 	// Tool registry — register tools enabled in config
-	toolReg := buildToolRegistry(cfg, sshExec, matrixClient, memStore, kStore, sharedKStore, mcpManager, roomCtx, logger)
+	toolReg := buildToolRegistry(cfg, sshExec, matrixClient, memStore, kStore, sharedKStore, mcpManager, skillLoader, skillExecutor, roomCtx, logger)
 
 	// Rate limiting for tools
 	if cfg.Security.ToolRateLimit.Enabled {
@@ -322,6 +347,7 @@ func New(cfg *config.AgentConfig, rules []decision.Rule, agentACL acl.ACL, logge
 		memStore:             memStore,
 		knowledgeStore:       kStore,
 		sharedKnowledgeStore: sharedKStore,
+		skillLoader:          skillLoader,
 		windowSize:           windowSize,
 		roomCtx:              roomCtx,
 	}
@@ -1031,6 +1057,8 @@ func buildToolRegistry(
 	kStore *shellknowledge.FileStore,
 	sharedKStore *shellknowledge.FileStore,
 	mcpManager *shellmcp.Manager,
+	skillLoader *shellskills.Loader,
+	skillExecutor *shellskills.Executor,
 	roomCtx *toolmemory.RoomContext,
 	logger *slog.Logger,
 ) *tools.Registry {
@@ -1116,5 +1144,16 @@ func buildToolRegistry(
 		}
 	}
 
+	// Skills tools — register skill search, load, read, and run tools
+	if skillLoader != nil {
+		reg.Register(toolskills.NewSkillSearch(skillLoader, cfg.Skills.Categories))
+		reg.Register(toolskills.NewSkillLoad(skillLoader))
+		reg.Register(toolskills.NewSkillReadResource(skillLoader))
+		if skillExecutor != nil {
+			reg.Register(toolskills.NewSkillRunScript(skillLoader, skillExecutor))
+		}
+		logger.Debug("registered skills tools")
+	}
+
 	return reg
 }