feat(framework): assets/ subfolder para distribuibles read-only

Refina la convencion de layout: el top de cada app distribuible
solo lleva el .exe + DLLs nativas; todo lo demas (TTFs, enrichers,
runtime Python, MCP servers) vive en <exe_dir>/assets/.

Cambios:
- cpp/CMakeLists.txt::add_imgui_app — copia las 5 TTFs (Karla,
  Roboto, DroidSans, Cousine, tabler-icons) a
  $<TARGET_FILE_DIR>/assets/ en lugar de junto al exe.
- framework/app_base: nuevas funciones fn::asset_dir() y
  fn::asset_path(name) que resuelven a <exe_dir>/assets/<name>.
- functions/core/icon_font.cpp::find_asset — anade
  fn::asset_path(filename) como PRIMERA ruta de busqueda, antes
  de las legacy ./<file> y ./assets/<file>. Mantiene los
  fallbacks para dev (FN_ASSETS_DIR, FN_CPP_ROOT).
- .claude/commands/compile.md — el deploy a Desktop pone TTFs +
  enrichers/ + runtime/ + gx-cli en <DEST>/assets/. Solo .exe y
  DLLs nativas (duckdb.dll) quedan en el top. local_files/ se
  preserva si existe.

Layout final:
  Desktop/apps/<APP>/
  ├── <APP>.exe + *.dll          (binario + DLLs Windows)
  ├── assets/                    (read-only distribuible)
  │   ├── *.ttf, enrichers/, runtime/, gx-cli, ...
  └── local_files/               (per-PC, creado al primer arranque)

Esto cierra la separacion conceptual de la convencion: la carpeta
es trivial de zippear (solo .exe + assets/), el reset/sync es
trivial (local_files/), y todas las apps del registry adoptan el
mismo layout via fn_framework.

Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>

cpp/CMakeLists.txt

@@ -154,8 +154,11 @@ add_library(fn_framework STATIC
     functions/core/panel_menu.cpp
     functions/core/layouts_menu.cpp
     functions/core/app_menubar.cpp
+    functions/core/logger.cpp
+    functions/core/log_window.cpp
     functions/gfx/gl_loader.cpp
     functions/core/layout_storage.cpp
+    functions/core/selectable_text.cpp
 )
 target_include_directories(fn_framework PUBLIC
     ${CMAKE_CURRENT_SOURCE_DIR}/framework
@@ -194,25 +197,31 @@ function(add_imgui_app target)
     target_include_directories(${target} PRIVATE
         ${FN_CPP_ROOT_DIR}/functions
     )
-    # Copia las fuentes junto al ejecutable para deploys autonomos (sin
-    # FN_CPP_ROOT en runtime). 4 TTFs vectoriales para el menu Settings + Tabler
-    # para los iconos TI_*.
+    # Convencion de layout (cpp_apps.md §7):
+    #   <exe_dir>/<app>.exe + <app>.dll     (binario + DLLs Windows convention)
+    #   <exe_dir>/assets/                   (read-only: ttfs, enrichers, runtime, etc.)
+    #   <exe_dir>/local_files/              (creado en runtime: ini, db, projects)
+    #
+    # add_imgui_app copia las TTFs a <exe_dir>/assets/. La app las
+    # encuentra en runtime via fn::asset_path() (icon_font.cpp).
+    set(_ASSETS_DIR $<TARGET_FILE_DIR:${target}>/assets)
     add_custom_command(TARGET ${target} POST_BUILD
+        COMMAND ${CMAKE_COMMAND} -E make_directory ${_ASSETS_DIR}
         COMMAND ${CMAKE_COMMAND} -E copy_if_different
                 ${FN_CPP_ROOT_DIR}/vendor/imgui/misc/fonts/Karla-Regular.ttf
-                $<TARGET_FILE_DIR:${target}>/Karla-Regular.ttf
+                ${_ASSETS_DIR}/Karla-Regular.ttf
         COMMAND ${CMAKE_COMMAND} -E copy_if_different
                 ${FN_CPP_ROOT_DIR}/vendor/imgui/misc/fonts/Roboto-Medium.ttf
-                $<TARGET_FILE_DIR:${target}>/Roboto-Medium.ttf
+                ${_ASSETS_DIR}/Roboto-Medium.ttf
         COMMAND ${CMAKE_COMMAND} -E copy_if_different
                 ${FN_CPP_ROOT_DIR}/vendor/imgui/misc/fonts/DroidSans.ttf
-                $<TARGET_FILE_DIR:${target}>/DroidSans.ttf
+                ${_ASSETS_DIR}/DroidSans.ttf
         COMMAND ${CMAKE_COMMAND} -E copy_if_different
                 ${FN_CPP_ROOT_DIR}/vendor/imgui/misc/fonts/Cousine-Regular.ttf
-                $<TARGET_FILE_DIR:${target}>/Cousine-Regular.ttf
+                ${_ASSETS_DIR}/Cousine-Regular.ttf
         COMMAND ${CMAKE_COMMAND} -E copy_if_different
                 ${FN_CPP_ROOT_DIR}/vendor/tabler-icons/tabler-icons.ttf
-                $<TARGET_FILE_DIR:${target}>/tabler-icons.ttf
+                ${_ASSETS_DIR}/tabler-icons.ttf
         VERBATIM
     )
 endfunction()

cpp/framework/app_base.cpp

@@ -106,6 +106,30 @@ const char* local_path(const char* name) {
     return buf.c_str();
 }
 
+namespace {
+const std::string& asset_dir_ref() {
+    static std::string cached;
+    static bool inited = false;
+    if (inited) return cached;
+    const std::string& edir = exe_dir_ref();
+    cached = edir.empty() ? std::string("assets") : edir + "/assets";
+    inited = true;
+    return cached;
+}
+} // namespace
+
+const char* asset_dir() { return asset_dir_ref().c_str(); }
+
+const char* asset_path(const char* name) {
+    static thread_local std::string buf;
+    buf = asset_dir_ref();
+    if (name && *name) {
+        if (!buf.empty() && buf.back() != '/' && buf.back() != '\\') buf += '/';
+        buf += name;
+    }
+    return buf.c_str();
+}
+
 void migrate_to_local_files(const char* const* names, std::size_t n) {
     if (!names || n == 0) return;
     const std::string& ldir = local_dir_ref();

cpp/framework/app_base.h

@@ -68,6 +68,15 @@ const char* local_dir();
 // proxima llamada — copia el valor si vas a guardarlo.
 const char* local_path(const char* name);
 
+// Devuelve `<exe_dir>/assets/` — read-only sidecar shipped con la
+// app (ttfs, enrichers, runtime Python, etc.). NO crea la carpeta;
+// si no existe, la app debe fallback a buscar los assets en
+// FN_CPP_ROOT u otras rutas. Sin trailing slash.
+const char* asset_dir();
+
+// Construye `<asset_dir>/<name>`. Mismo lifetime que local_path.
+const char* asset_path(const char* name);
+
 // Mueve los archivos listados de cwd o exe_dir a local_files/ si
 // existen ahi pero NO existen ya en local_files/. Idempotente. Las
 // apps lo llaman al iniciar para migrar instalaciones viejas.

cpp/functions/core/icon_font.cpp

@@ -1,6 +1,7 @@
 #include "icon_font.h"
 
 #include "app_settings.h"
+#include "../../framework/app_base.h"
 #include "imgui.h"
 
 #include <cstdio>
@@ -25,13 +26,18 @@ bool file_exists(const char* path) {
     return false;
 }
 
-// Busca un asset (TTF) en las rutas estandar del registry. Devuelve la primera
+// Busca un asset (TTF) en las rutas estandar. Devuelve la primera
 // ruta valida o vacio.
 //
-// Orden: ./<filename> → ./assets/<filename> → $FN_ASSETS_DIR/<filename>
-//      → ${FN_CPP_ROOT}/<repo_subpath>
+// Orden:
+//   1. fn::asset_path(filename)            <exe_dir>/assets/<filename>
+//   2. ./<filename>                        cwd directo (legacy)
+//   3. ./assets/<filename>                 cwd subdir (legacy / dev)
+//   4. $FN_ASSETS_DIR/<filename>           override env
+//   5. ${FN_CPP_ROOT}/<repo_subpath>       fuente del repo (dev sin build)
 std::string find_asset(const char* filename, const char* repo_subpath) {
     std::string p;
+    p = fn::asset_path(filename);              if (file_exists(p.c_str())) return p;
     p = std::string("./") + filename;          if (file_exists(p.c_str())) return p;
     p = std::string("./assets/") + filename;   if (file_exists(p.c_str())) return p;
     if (const char* env = std::getenv("FN_ASSETS_DIR")) {