feat(0130): kanban_cpp v2 — backend Go + 5 registry parser fns + epic/sub-issues

Registry (issue 0130a):
- 5 fns infra: parse_issue_md, write_issue_md, scan_issues_dir,
  scan_flows_dir, watch_dir_fsnotify
- 3 tipos: Issue, Flow, FsEvent
- Tests round-trip + scan reales + watcher fsnotify (all PASS)
- Capability group 'kanban' nuevo (docs/capabilities/kanban.md)

Apps:
- apps/kanban_cpp/ (sub-repo) — frontend ImGui: board drag-drop,
  flows, filters, detail con CSV editors
- apps/kanban_cpp/backend/ — Go service port 8487: REST + SSE +
  fsnotify watcher, parser bidireccional MD<->SQLite cache

Issues:
- dev/issues/0130-kanban-cpp-v2.md (epic)
- 0130a parser, 0130b backend, 0130c frontend

CMakeLists.txt: add_subdirectory apps/kanban_cpp (registrado por
init_cpp_app scaffolder).

End-to-end verde: backend devuelve 189 issues + 9 flows; PATCH a
/api/issues/{id} reescribe .md (solo frontmatter, body intacto);
frontend --self-test exit 0; tests Go infra 5/5 PASS.

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

dev/issues/0130-kanban-cpp-v2.md

@@ -1,22 +1,28 @@
 ---
 id: "0130"
-title: "Kanban C++ v2 — gestor de dev/issues y dev/flows con backend Go + frontend ImGui"
+title: Kanban C++ v2 — gestor de dev/issues y dev/flows con backend Go + frontend ImGui
 status: pendiente
 type: epic
 domain:
-  - cpp-stack
-  - apps-infra
-  - dev-ux
+    - cpp-stack
+    - apps-infra
+    - dev-ux
 scope: multi-app
 priority: alta
 depends: []
 blocks: []
 related:
-  - "0112"
-  - "0119"
-created: 2026-05-22
-updated: 2026-05-22
-tags: [kanban, cpp, imgui, dev_ux, issues, flows]
+    - "0112"
+    - "0119"
+tags:
+    - kanban
+    - cpp
+    - imgui
+    - dev_ux
+    - issues
+    - flows
+created: "2026-05-22"
+updated: "2026-05-22"
 ---
 
 # 0130 — Kanban C++ v2