bsdl: extract parser into standalone libbsdl, pulled via FetchContent

The BSDL loader (seeded from the Viveris parser) now lives in its own
LGPL repo, electronics/libbsdl, consumed with CMake FetchContent.
Local development override: -DFETCHCONTENT_SOURCE_DIR_BSDL=<path>.
src/modules/bsdl_parser/ is removed; callers go through the libbsdl
API. Build verified against the libbsdl checkout.

CMakeLists.txt

@@ -1,4 +1,4 @@
-cmake_minimum_required(VERSION 3.10)
+cmake_minimum_required(VERSION 3.14)
 
 project(BoundaryScanExplorer)
 
@@ -6,6 +6,19 @@ project(BoundaryScanExplorer)
 # build/src/bs/ where the source tree would otherwise mirror it.
 set(CMAKE_RUNTIME_OUTPUT_DIRECTORY ${CMAKE_BINARY_DIR})
 
+# ---- libbsdl (BSDL parser, extracted from this repo and now standalone) ----
+# Pulled via FetchContent from the canonical Gitea URL. For a local checkout,
+# set -DFETCHCONTENT_SOURCE_DIR_BSDL=/path/to/libbsdl at configure time
+# (built-in FetchContent override — no clone happens).
+include(FetchContent)
+set(BSDL_BUILD_CLI   OFF CACHE BOOL "" FORCE)
+set(BSDL_BUILD_TESTS OFF CACHE BOOL "" FORCE)
+FetchContent_Declare(bsdl
+    GIT_REPOSITORY ssh://gitea@git.beafrancois.fr:8329/electronics/libbsdl.git
+    GIT_TAG        main
+)
+FetchContent_MakeAvailable(bsdl)
+
 # Digilent JTAG-SMT* backend. The driver dlopen's libdjtg/libdmgr at
 # runtime and degrades to "no probe" if they're absent, so building it
 # in costs nothing — default ON. Needs <dlfcn.h>, so UNIX only.