feat: subcomando doctor (verificacion post-instalacion)

- core/doctor.sh: run_doctor_checks() — symlink estable, version.txt, clinfo, vainfo, grupos render/video; salida con print_*, exit code = numero de checks con fallo
- clinfo/vainfo con patron captura-then-parse (clinfo tiene salida enorme: grep -q SIGPIPE-mata la pipe y reportaba falso negativo bajo pipefail — verificado en sistema real con plataforma OpenCL detectada)
- main.sh: dispatch del subcomando ANTES del root check (el doctor es verificacion de usuario, sin root) — requiere el reorden routes/source antes de privilegios (resuelve la causa raiz de O2; el cambio cosmico echo->print_error queda para fase siguiente)

core/doctor.sh

@@ -0,0 +1,70 @@
+#!/bin/bash
+# ------------------------------------------------------------------------------
+# doctor: verificacion post-instalacion (sin root requerido).
+# Sourced por main.sh (subcomando doctor) y por el menu.
+# Salida con print_* de common.sh; exit code = numero de checks con fallo.
+# ------------------------------------------------------------------------------
+
+run_doctor_checks() {
+    print_step "Doctor: verificando la instalacion de OpenVINO..."
+    local fails=0
+
+    # 1. Symlink estable
+    if [ -L /opt/intel/openvino_2026 ]; then
+        print_substep "Symlink OK: /opt/intel/openvino_2026 -> $(readlink /opt/intel/openvino_2026)"
+    else
+        print_error "Falta el symlink /opt/intel/openvino_2026 (¿la instalacion no se realizo?)"
+        fails=$((fails+1))
+    fi
+
+    # 2. Version instalada
+    if [ -f /opt/intel/openvino_2026/runtime/version.txt ]; then
+        print_substep "Version instalada: $(cat /opt/intel/openvino_2026/runtime/version.txt)"
+    else
+        print_error "No se encontro runtime/version.txt"
+        fails=$((fails+1))
+    fi
+
+    # 3. OpenCL (clinfo)
+    if command -v clinfo >/dev/null 2>&1; then
+        CLINFO_OUT=$(clinfo 2>/dev/null || true)   # clinfo exits !=0 when no devices
+        if [[ "${CLINFO_OUT^^}" == *"DEVICE NAME"* ]]; then
+            print_substep "OpenCL OK (dispositivo detectado)"
+        else
+            print_warning "clinfo no detecta dispositivo (¿falta el driver NEO o los grupos render/video?)"
+            fails=$((fails+1))
+        fi
+    else
+        print_warning "clinfo no esta instalado"
+        fails=$((fails+1))
+    fi
+
+    # 4. VAAPI (vainfo)
+    if command -v vainfo >/dev/null 2>&1; then
+        VAINFO_OUT=$(vainfo 2>/dev/null || true)
+        if [[ "${VAINFO_OUT^^}" == *"DRIVER VERSION"* ]]; then
+            print_substep "VAAPI OK (driver cargado)"
+        else
+            print_warning "vainfo no carga driver (¿falta intel-media-va-driver?)"
+            fails=$((fails+1))
+        fi
+    else
+        print_warning "vainfo no esta instalado"
+        fails=$((fails+1))
+    fi
+
+    # 5. Grupos render/video
+    if id -Gn 2>/dev/null | grep -qw render && id -Gn 2>/dev/null | grep -qw video; then
+        print_substep "Grupos OK: el usuario esta en render y video"
+    else
+        print_warning "El usuario NO esta en los grupos render/video (reinicia la sesion tras instalar)"
+        fails=$((fails+1))
+    fi
+
+    if [ "$fails" -eq 0 ]; then
+        print_substep "Doctor: TODO OK"
+    else
+        print_warning "Doctor: $fails check(s) con avisos o fallos"
+    fi
+    return "$fails"
+}

main.sh

@@ -7,13 +7,6 @@ set -euo pipefail
 # It supports Debian 13, Ubuntu 22.04/24.04/26.04, and Fedora (latest stable versions).
 # ------------------------------------------------------------------------------
 
-# privileges
-if [ "$EUID" -ne 0 ]; then
-    echo "ERROR: This script must be run as root. Use:"
-    echo "  sudo bash $0"
-    exit 1
-fi
-
 # routes
 SCRIPT_DIR="$(cd "$(dirname "${BASH_SOURCE[0]}")" && pwd)"
 CORE_DIR="$SCRIPT_DIR/core"
@@ -22,6 +15,22 @@ MODULES_DIR="$SCRIPT_DIR/modules"
 # print
 source "$CORE_DIR/common.sh"
 
+# Subcommands (before the root check: doctor is a post-install user verification)
+case "${1:-}" in
+    doctor)
+        source "$CORE_DIR/doctor.sh"
+        run_doctor_checks
+        exit 0
+        ;;
+esac
+
+# privileges
+if [ "$EUID" -ne 0 ]; then
+    echo "ERROR: This script must be run as root. Use:"
+    echo "  sudo bash $0"
+    exit 1
+fi
+
 print_step "============================================="
 print_step "  OpenVINO 2026 - SimpleInstaller"
 print_step "============================================="