SubMiner/changes/2026-03-27-task-238.7-main-boot-split.md

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.