feat: toml init file and save configs in files

.gitmodules

@@ -1,3 +1,6 @@
 [submodule "lib/bm_core"]
 	path = lib/bm_core
 	url = https://github.com/bristlemouth/bm_core.git
+[submodule "lib/tomlc17"]
+	path = lib/tomlc17
+	url = https://github.com/cktan/tomlc17.git

CMakeLists.txt

@@ -40,6 +40,12 @@ set(BM_HOSTED ON CACHE BOOL "Build bm_core for hosted environment (Linux/macOS)"
 
 add_subdirectory(${BM_CORE_DIR})
 
+# ---------------------------------------------------------------------------
+# tomlc17 – TOML v1.1 parser (submodule, MIT license, tag R260323)
+# ---------------------------------------------------------------------------
+add_library(tomlc17 STATIC ${CMAKE_CURRENT_SOURCE_DIR}/lib/tomlc17/src/tomlc17.c)
+target_include_directories(tomlc17 PUBLIC ${CMAKE_CURRENT_SOURCE_DIR}/lib/tomlc17/src)
+
 # ---------------------------------------------------------------------------
 # Git SHA – regenerated on every build via a custom command.
 # The helper script only overwrites git_sha.h when the SHA changes,
@@ -81,7 +87,7 @@ target_include_directories(bm_sbc_core
 target_include_directories(bm_sbc_core PRIVATE ${CMAKE_CURRENT_BINARY_DIR}/generated)
 add_dependencies(bm_sbc_core git_sha_header)
 
-target_link_libraries(bm_sbc_core PUBLIC bmcore)
+target_link_libraries(bm_sbc_core PUBLIC bmcore tomlc17)
 
 # ---------------------------------------------------------------------------
 # App selection helpers (section 5)

examples/node1.toml

@@ -0,0 +1,9 @@
+# Example init file for a 2-node mesh: Node 1
+#
+# Usage:
+#   bm_sbc_multinode --init examples/node1.toml
+
+node-id    = "0x0000000000000001"
+cfg-dir    = "/tmp/bm_node1"
+socket-dir = "/tmp"
+peers      = ["0x0000000000000002"]

examples/node2.toml

@@ -0,0 +1,9 @@
+# Example init file for a 2-node mesh: Node 2
+#
+# Usage:
+#   bm_sbc_multinode --init examples/node2.toml
+
+node-id    = "0x0000000000000002"
+cfg-dir    = "/tmp/bm_node2"
+socket-dir = "/tmp"
+peers      = ["0x0000000000000001"]