`apps/nrf52_node`

Role = product app shell / target app shell.

apps/nrf52_node is the nRF52 node product app shell executable baseline.

It is not a PlatformIO project directory and does not contain build host files in Phase 8 Build/AppShell Executable Convergence.

Build Entrypoint invokes.
App Shell composes.
Target chooses.
Board describes.
UX Pack presents.

Build Entrypoint

Build entrypoint = builds/pio_nrf52

Historical source identity = removed root esp_pio and removed root gat562_mesh_evb_pro

Future Responsibilities

May:

select nRF52 target profile
select board package
select node/status UX profile
invoke product composition
hand off to runtime facade

Must not:

own build host files
own PlatformIO environment definitions
define board facts
implement HAL details
implement screen internals
assemble Chat/Map/GPS runtime directly in build wrapper

Thin App Shell Entrypoint Declaration

Current source-level shell descriptor:

src/nrf52_node_app_shell.h
src/nrf52_node_app_shell.cpp
trailmate-nrf52-node-app-shell

Current config:

target_family = nrf52_node
default_ux_pack_id = tiny_node_status
historical_generic_root_name = removed root esp_pio
historical_board_root_name = removed root gat562_mesh_evb_pro
historical_role = pre-refactor PlatformIO/nRF52 implementation roots
replacement_owner = apps/nrf52_node + builds/pio_nrf52 + boards/gat562_mesh_evb_pro

No behavior change in Phase 8 Build/AppShell Executable Convergence.