chore: scaffold skill_tree (issue 0109)

Initial scaffold via init_cpp_app_bash_pipelines:
- main.cpp con Tree + Inspector panels (placeholders)
- app.md con trio icon (tree-structure + #c026d3) + e2e_checks
- CMakeLists.txt via add_imgui_app
- appicon.ico generado con generate_app_icon_py_infra

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

CMakeLists.txt

@@ -0,0 +1,14 @@
+add_imgui_app(skill_tree
+    main.cpp
+)
+target_include_directories(skill_tree PRIVATE ${CMAKE_CURRENT_SOURCE_DIR})
+
+# fn_table_viz: provides data_table::render(), viz_render, TQL engine, Lua, LLM.
+# Guard keeps the app compilable in builds where vendor/lua is absent.
+if(TARGET fn_table_viz)
+    target_link_libraries(skill_tree PRIVATE fn_table_viz)
+endif()
+
+if(WIN32)
+    set_target_properties(skill_tree PROPERTIES WIN32_EXECUTABLE TRUE)
+endif()

app.md

@@ -0,0 +1,51 @@
+---
+name: skill_tree
+lang: cpp
+domain: tools
+description: "Mapa interactivo de issues+flows en anillos concentricos por estado, click para spawn agentes"
+tags: [dashboard, meta, imgui]
+icon:
+  phosphor: "tree-structure"
+  accent: "#c026d3"
+uses_functions: []
+uses_types: []
+framework: "imgui"
+entry_point: "main.cpp"
+dir_path: "apps/skill_tree"
+repo_url: "https://gitea.organic-machine.com/dataforge/skill_tree"
+e2e_checks:
+  - id: build
+    cmd: "cd cpp && cmake --build build --target skill_tree -j"
+    timeout_s: 300
+  - id: self_test
+    cmd: "./cpp/build/apps/skill_tree/skill_tree --self-test"
+    timeout_s: 30
+    severity: warning
+---
+
+# skill_tree
+
+Mapa interactivo de los issues + flows del registry en anillos concentricos por estado.
+Click en un nodo abre el panel `Inspector` con su Definition of Done y las funciones
+del registry asociadas. Dos botones por nodo:
+
+- **Generate ideas** (`claude -p`) → escribe a `idea_drafts` para revision manual.
+- **Run autonomous-task** (`fn-orquestador`) → spawn subagente en sandbox `auto/<issue>`.
+
+Roadmap: issue 0109. Diseno completo en el frontmatter del epic.
+
+## Build
+
+```bash
+cd cpp && cmake --build build --target skill_tree -j
+```
+
+## Run
+
+```bash
+./cpp/build/apps/skill_tree/skill_tree
+```
+
+## Estado
+
+MVP fase A — sub-issue 0109a: shell + parsers issues/flows. Sin render de grafo todavia.

main.cpp

@@ -0,0 +1,52 @@
+#include <imgui.h>
+#include "app_base.h"
+#include "core/panel_menu.h"
+#include "core/icons_tabler.h"
+#include "core/logger.h"
+// #include "viz/data_table.h"  // uncomment to enable data_table::render() panel
+
+static bool g_show_tree      = true;
+static bool g_show_inspector = true;
+
+static void draw_tree() {
+    if (!ImGui::Begin(TI_GRAPH " Tree", &g_show_tree)) {
+        ImGui::End();
+        return;
+    }
+    ImGui::TextUnformatted("skill_tree v0.1.0 — fase A (shell)");
+    ImGui::TextUnformatted("");
+    ImGui::TextUnformatted("Parsers de dev/issues + dev/flows pendientes (0109a).");
+    ImGui::TextUnformatted("Render anillos pendiente (0109b).");
+    ImGui::End();
+}
+
+static void draw_inspector() {
+    if (!ImGui::Begin(TI_INFO_CIRCLE " Inspector", &g_show_inspector)) {
+        ImGui::End();
+        return;
+    }
+    ImGui::TextDisabled("Click en un nodo del Tree para inspeccionar.");
+    ImGui::End();
+}
+
+static void render() {
+    if (g_show_tree)      draw_tree();
+    if (g_show_inspector) draw_inspector();
+}
+
+int main(int /*argc*/, char** /*argv*/) {
+    static fn_ui::PanelToggle panels[] = {
+        { "Tree",      nullptr, &g_show_tree      },
+        { "Inspector", nullptr, &g_show_inspector },
+    };
+
+    fn::AppConfig cfg;
+    cfg.title       = "skill_tree";
+    cfg.about       = { "skill_tree", "0.1.0",
+                        "Mapa interactivo de issues+flows en anillos concentricos por estado." };
+    cfg.log         = { "skill_tree.log", 1 };
+    cfg.panels      = panels;
+    cfg.panel_count = sizeof(panels) / sizeof(panels[0]);
+
+    return fn::run_app(cfg, render);
+}