feat: launcher descubre agentes en _specials/ con validacion de tipo

El launcher ahora escanea agents/_specials/*/config.yaml ademas de
agents/*/config.yaml para descubrir agentes del sistema con identidad
Matrix (ej: father-bot). Los SpecialConfig ya cargados (orchestrator)
se detectan y saltan via isSpecialConfig() para evitar errores de
validacion.

Tambien actualiza dev-scripts/_common.sh para que config_path_for()
y list_agents_raw() incluyan _specials/ en la busqueda.

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

dev-scripts/_common.sh

@@ -51,9 +51,10 @@ read_pid() {
 }
 
 # Map agent ID to its config path by scanning agent directories.
+# Also scans agents/_specials/ for privileged system agents (e.g. father-bot).
 config_path_for() {
   local target_id="$1"
-  for cfg in agents/*/config.yaml; do
+  for cfg in agents/*/config.yaml agents/_specials/*/config.yaml; do
     [[ -f "$cfg" ]] || continue
     local id
     id=$(grep -m1 '^  id:' "$cfg" | awk '{print $2}')
@@ -150,8 +151,9 @@ is_launcher_running() {
 
 # ── Agent discovery ────────────────────────────────────────────────────────
 # Prints: id|version|enabled|description  (one line per agent)
+# Also scans agents/_specials/ for privileged system agents.
 list_agents_raw() {
-  for cfg in agents/*/config.yaml; do
+  for cfg in agents/*/config.yaml agents/_specials/*/config.yaml; do
     [[ -f "$cfg" ]] || continue
     local id version enabled desc
     id=$(grep -m1 '^  id:'       "$cfg" | awk '{print $2}')