chore: snapshot WIP previo + flow 0008 + 7 sub-issues (0112-0119)

Snapshot de WIP acumulado de sesiones previas antes de merge wave 1
del flow 0008 (kanban_cpp + agent_runner_api + DoD schema).

Incluye:
- dev/flows/0008-kanban-cpp-and-agent-workflows.md
- dev/issues/0112-0119*.md (7 sub-issues)
- WIP previo en cmd/fn/doctor.go, registry/*, modules/, cpp/, etc.

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

cpp/tests/CMakeLists.txt

@@ -256,6 +256,16 @@ add_fn_test(test_tql_to_sql test_tql_to_sql.cpp
 add_fn_test(test_llm_anthropic test_llm_anthropic.cpp
     ${CMAKE_CURRENT_SOURCE_DIR}/../functions/core/llm_anthropic.cpp)
 
+# --- Issue 0109a — parse_md_frontmatter: pure YAML-subset frontmatter parser --
+add_fn_test(test_parse_md_frontmatter test_parse_md_frontmatter.cpp
+    ${CMAKE_CURRENT_SOURCE_DIR}/../functions/core/parse_md_frontmatter.cpp)
+target_compile_definitions(test_parse_md_frontmatter PRIVATE
+    FN_TEST_REPO_ROOT="${CMAKE_CURRENT_SOURCE_DIR}/../..")
+
+# --- Issue 0109b — compute_ring_layout: geometria pura para skill_tree -------
+add_fn_test(test_compute_ring_layout test_compute_ring_layout.cpp
+    ${CMAKE_CURRENT_SOURCE_DIR}/../functions/core/compute_ring_layout.cpp)
+
 # --- Visual golden-image diff (issue 0048) ---------------------------------
 # El binario primitives_gallery se compila con --capture; el test compara los
 # PNGs generados con los goldens en cpp/tests/golden/. Si no hay goldens o el