docs(issues): marcar 0025 y 0026 como completados + WIP master

Wave 1 de parallel-fix-issues integrada a master:
- 0025: text_editor_cpp_core + file_watcher_cpp_core
- 0026: gl_texture_load_cpp_gfx (vendor: stb_image v2.30)

Ademas se commitea WIP previo de master que estaba sin commitear (cambios
en shaders_lab, dag_*, framework, tokens, kpi_card, gl_loader.md, etc.)
para dejar HEAD buildable.

Notas:
- Algunos deps del gallery (button.cpp, toolbar.cpp, modal_dialog.cpp...)
  siguen UNTRACKED — gating con FN_BUILD_GALLERY=ON (default OFF) para
  que master build (sin flag) no los necesite.
- Build OK con y sin flag. fn index registra 904 functions.

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

cpp/functions/gfx/gl_loader.cpp

@@ -34,6 +34,17 @@ PFNGLUNIFORM4FVPROC          fn_glUniform4fv          = nullptr;
 PFNGLUSEPROGRAMPROC          fn_glUseProgram          = nullptr;
 PFNGLACTIVETEXTUREPROC       fn_glActiveTexture       = nullptr;
 PFNGLGENERATEMIPMAPPROC      fn_glGenerateMipmap      = nullptr;
+PFNGLBUFFERDATAPROC          fn_glBufferData          = nullptr;
+PFNGLDRAWARRAYSINSTANCEDPROC fn_glDrawArraysInstanced = nullptr;
+PFNGLENABLEVERTEXATTRIBARRAYPROC fn_glEnableVertexAttribArray = nullptr;
+PFNGLVERTEXATTRIBDIVISORPROC fn_glVertexAttribDivisor = nullptr;
+PFNGLVERTEXATTRIBPOINTERPROC fn_glVertexAttribPointer = nullptr;
+PFNGLBINDRENDERBUFFERPROC    fn_glBindRenderbuffer    = nullptr;
+PFNGLDELETERENDERBUFFERSPROC fn_glDeleteRenderbuffers = nullptr;
+PFNGLFRAMEBUFFERRENDERBUFFERPROC fn_glFramebufferRenderbuffer = nullptr;
+PFNGLGENRENDERBUFFERSPROC    fn_glGenRenderbuffers    = nullptr;
+PFNGLRENDERBUFFERSTORAGEPROC fn_glRenderbufferStorage = nullptr;
+PFNGLFRAMEBUFFERTEXTUREPROC  fn_glFramebufferTexture  = nullptr;
 
 namespace fn::gfx {
 
@@ -74,6 +85,17 @@ bool gl_loader_init() {
     LOAD(glUseProgram);
     LOAD(glActiveTexture);
     LOAD(glGenerateMipmap);
+    LOAD(glBufferData);
+    LOAD(glDrawArraysInstanced);
+    LOAD(glEnableVertexAttribArray);
+    LOAD(glVertexAttribDivisor);
+    LOAD(glVertexAttribPointer);
+    LOAD(glBindRenderbuffer);
+    LOAD(glDeleteRenderbuffers);
+    LOAD(glFramebufferRenderbuffer);
+    LOAD(glGenRenderbuffers);
+    LOAD(glRenderbufferStorage);
+    LOAD(glFramebufferTexture);
 
     #undef LOAD
     return true;