refactor: mover runtime Go de agents/ a devagents/

agents/ ahora solo contiene carpetas de agentes (config, reglas, prompts).
El runtime (Agent, Robot, Runner, registry, handler, commands, llm, memory)
vive en devagents/ como package devagents.

Cambios:
- git mv agents/*.go → devagents/*.go
- package agents → package devagents en todos los archivos movidos
- Actualizar imports en agents/*/agent.go, cmd/launcher/, dev-scripts/
- Actualizar docs: CLAUDE.md, rules/, docs/e2ee.md, issues pendientes

Build y tests pasan sin errores.

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

dev-scripts/agent/convert-to-robot.sh

@@ -106,12 +106,12 @@ cat > "$DIR/agent.go" << GO
 package ${PACKAGE}
 
 import (
-	"github.com/enmanuel/agents/agents"
+	"github.com/enmanuel/agents/devagents"
 	"github.com/enmanuel/agents/pkg/decision"
 )
 
 func init() {
-	agents.Register("${ID}", Rules)
+	devagents.Register("${ID}", Rules)
 }
 
 // Rules returns nil — robots only respond to commands.