feat: integrar structured logging en todos los componentes del shell

Se propaga *slog.Logger a todos los componentes impuros del shell:
- shell/bus/ — logs de subscribe, send, reply, timeout, unsubscribe
- shell/effects/ — duración y resultado de cada action ejecutada
- shell/llm/ (anthropic, openai, factory) — request/response con tokens, duración, fallback
- shell/memory/sqlite — open, save, recall, close con detalles
- shell/ssh/ — inicio, fin, errores y duración de comandos SSH
- tools/registry — registro, ejecución y errores de herramientas

Se usa el paquete shell/logger para field names consistentes (FieldDurationMS, FieldTokensUsed, etc.).
Cada componente recibe el logger por inyección de dependencias, sin globals.
Las firmas de New/FromConfig se actualizan para aceptar *slog.Logger.

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

shell/effects/runner.go

@@ -5,8 +5,10 @@ import (
 	"context"
 	"fmt"
 	"log/slog"
+	"time"
 
 	"github.com/enmanuel/agents/pkg/decision"
+	"github.com/enmanuel/agents/shell/logger"
 	"github.com/enmanuel/agents/shell/ssh"
 )
 
@@ -37,12 +39,17 @@ func NewRunner(matrix MatrixSender, ssh *ssh.Executor, logger *slog.Logger) *Run
 
 // Execute runs each action sequentially and returns results.
 func (r *Runner) Execute(ctx context.Context, roomID string, actions []decision.Action) []Result {
+	r.logger.Debug("effects_batch", "room", roomID, "count", len(actions))
 	results := make([]Result, 0, len(actions))
 	for _, a := range actions {
+		start := time.Now()
 		res := r.executeOne(ctx, roomID, a)
+		ms := time.Since(start).Milliseconds()
 		results = append(results, res)
 		if res.Err != nil {
-			r.logger.Error("action failed", "kind", a.Kind, "err", res.Err)
+			r.logger.Error("action_failed", logger.FieldAction, a.Kind, logger.FieldDurationMS, ms, "err", res.Err)
+		} else {
+			r.logger.Info("action_done", logger.FieldAction, a.Kind, logger.FieldDurationMS, ms)
 		}
 	}
 	return results