Land the package filesystem shell: streaming atomic package_io, journaled rollback carve-out, asymmetric platform pickers

src/shell/package/CMakeLists.txt

@@ -0,0 +1,20 @@
+# The filesystem + dialog seam for bank packages. package_io / package_rollback are
+# REAPER-free (standard filesystem only), so the pure-library/test helpers fit and
+# their tests run without a DAW. The export/import verbs that drive all three targets
+# are not in this directory yet.
+
+reasampler_pure_library(package_io SOURCES package_io.cpp LINK PUBLIC file_bytes)
+reasampler_test(package_io LINK package_io)
+
+reasampler_pure_library(package_rollback SOURCES package_rollback.cpp LINK PUBLIC package_io)
+reasampler_test(package_rollback LINK package_rollback)
+
+# The platform pickers touch the REAPER API and the native save dialog, so no test
+# target can exercise them; declared as a library so both picker paths stay compiled.
+add_library(package_pickers STATIC package_pickers.cpp)
+target_include_directories(package_pickers PUBLIC ${REASAMPLER_SRC_DIR})
+target_include_directories(package_pickers PRIVATE ${SDK_INC} ${WDL_INC})
+if(NOT WIN32)
+    # Match the loadable modules: SWELL is provided by the host REAPER at runtime.
+    target_compile_definitions(package_pickers PRIVATE SWELL_PROVIDED_BY_APP)
+endif()