refactor(build): remove core component

Author: baba-dev

DOCS/REPO_MAP.md

@@ -3,10 +3,10 @@
 - `platforms/tab5/` – ESP-IDF application for the Tab5 hardware. Contains the
   board-specific `main/` component, sdkconfig defaults, partition table, and
   audio assets that ship with the firmware image.
-- `components/core/` – device-agnostic logic (ring buffer, settings store,
-  future shared services) that is built both for firmware and host tests.
 - `custom/` – application-specific UI, integration layers, and runtime asset
   loaders. Files here are shared across hardware and desktop targets.
+- `custom/app_trace.h` – shared logging helpers available to both firmware and
+  host targets; the former `components/core/` directory has been removed.
 - `tests/` – host-side unit tests, LVGL snapshot tests, and future firmware
   smoke tests. Invoked with `make test`.
 - `tools/` – development utilities such as format/lint wrappers and the asset

TRACEPOINTS.md

@@ -1,6 +1,6 @@
 # Tracepoints
 
-Use the macros in `components/core/include/app_trace.h` to annotate important
+Use the macros in `custom/app_trace.h` to annotate important
 runtime events. Common sections/events:
 
 | Section  | Event          | Purpose                                  |

components/CMakeLists.txt

@@ -1,5 +1,4 @@
 set(PROJECT_COMPONENTS
-    core
     settings_core
     settings_ui
     connection_tester