chore: auto-commit (43 archivos)

- .mcp.json
- bash/functions/infra/write_mcp_jupyter_config.md
- bash/functions/infra/write_mcp_jupyter_config.sh
- cpp/CMakeLists.txt
- cpp/apps/chart_demo
- cpp/apps/shaders_lab
- cpp/functions/gfx/gl_framebuffer.cpp
- cpp/functions/gfx/gl_framebuffer.h
- cpp/functions/gfx/gl_framebuffer.md
- cpp/functions/gfx/mesh_gpu.md
- ...

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

cpp/functions/viz/mesh_viewer.cpp

@@ -105,7 +105,7 @@ GLuint compile_program() {
 void ensure_init(Cache& c) {
     if (c.initialized) return;
     fn::gfx::gl_loader_init();
-    fn::gfx::fb_init(c.fb);
+    fn::gfx::fb_init_depth(c.fb);
     c.program = compile_program();
     if (c.program) {
         c.loc_view  = glGetUniformLocation(c.program, "u_view");
@@ -145,10 +145,9 @@ void mesh_viewer(const char* id, const MeshViewerConfig& cfg) {
         glBindFramebuffer(GL_FRAMEBUFFER, c.fb.fbo);
         glViewport(0, 0, w, h);
         glClearColor(0.10f, 0.10f, 0.13f, 1.0f);
-        glClear(GL_COLOR_BUFFER_BIT);
-        // No depth attachment in our FBO — fall back to back-to-front-ish via
-        // GL_DEPTH_TEST off. For inspection meshes this is fine; documented.
-        glDisable(GL_DEPTH_TEST);
+        glClear(GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT);
+        glEnable(GL_DEPTH_TEST);
+        glDepthFunc(GL_LESS);
 
         glUseProgram(c.program);
         auto m = fn::core::orbit_camera_matrices(*cfg.cam);
@@ -183,7 +182,7 @@ void mesh_viewer(const char* id, const MeshViewerConfig& cfg) {
         // Restore GL state.
         glBindFramebuffer(GL_FRAMEBUFFER, (GLuint)prev_fbo);
         glViewport(prev_vp[0], prev_vp[1], prev_vp[2], prev_vp[3]);
-        if (prev_depth) glEnable(GL_DEPTH_TEST);
+        if (prev_depth) glEnable(GL_DEPTH_TEST); else glDisable(GL_DEPTH_TEST);
     }
 
     // Display.