type: internal
area: runtime

- Split `src/main.ts` boot wiring into dedicated `src/main/boot/services.ts`, `src/main/boot/runtimes.ts`, and `src/main/boot/handlers.ts` modules.
- Added focused tests for the new boot-phase seams and kept the startup/typecheck/build verification lanes green.
- Updated internal architecture/task docs to record the boot-phase split and new ownership boundary.