Phase 7: Rename Apps/ → apps/ and apply programs/ convention (closes #4905 phase 7)

[tclune]

Summary

Phase 7 of the MAPL v3 directory restructuring (#4905).

Work Items

1. Rename Apps/ → apps/

• git mv Apps/ apps/
• Update top-level CMakeLists.txt: add_subdirectory(Apps) → add_subdirectory(apps)

2. Move pfio/ demo executables → pfio/programs/

The four demo/utility executables currently defined inline in pfio/CMakeLists.txt should move to a pfio/programs/ subdirectory:

• pfio_open_close.x (pfio_open_close.F90)
• pfio_server_demo.x (pfio_server_demo.F90)
• pfio_collective_demo.x (pfio_collective_demo.F90)
• pfio_writer.x (pfio_writer.F90)

3. Move mp_utils/profiler/demo/ → mp_utils/profiler/examples/

• git mv mp_utils/profiler/demo/ mp_utils/profiler/examples/
• Update mp_utils/profiler/CMakeLists.txt: add_subdirectory(demo) → add_subdirectory(examples)

Non-goals / Deferred

• geom/ does not currently have a raster_to_mesh/ subdirectory (already relocated in a prior phase); no geom/programs/ move needed.

References

• Parent: Implement MAPL v3 directory & library restructuring #4905
• Previous phase: Phase 6: Rename gridcomps/ subdirectories (closes #4905 phase 6) #4938