refactor: split main.ts into domain runtimes

backlog/tasks/task-263 - Create-coarse-startup-bootstrap-wrapper.md

@@ -0,0 +1,28 @@
+---
+id: TASK-263
+title: Create coarse startup bootstrap wrapper
+status: To Do
+assignee: []
+created_date: '2026-03-31 17:21'
+labels:
+  - refactor
+  - main
+  - startup
+dependencies: []
+---
+
+## Description
+
+<!-- SECTION:DESCRIPTION:BEGIN -->
+Move the large createMainStartupRuntime construction and its self-reference handling out of src/main.ts into a coarse startup bootstrap wrapper. Keep behavior identical and shrink the startup section materially.
+<!-- SECTION:DESCRIPTION:END -->
+
+## Acceptance Criteria
+<!-- AC:BEGIN -->
+- [ ] #1 New wrapper module(s) live under src/main/
+- [ ] #2 Wrapper owns createMainStartupRuntime construction and self-reference handling
+- [ ] #3 src/main.ts startup section becomes materially smaller
+- [ ] #4 Files stay under 500 LOC
+- [ ] #5 Focused tests cover the wrapper if useful
+- [ ] #6 No runtime behavior changes
+<!-- AC:END -->