refactor(main): extract jellyfin and anilist runtime composers

backlog/tasks/task-94 - Reduce-main.ts-to-thin-composition-root.md

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+---
+id: TASK-94
+title: Reduce main.ts to thin composition root
+status: In Progress
+assignee: []
+created_date: '2026-02-20 12:06'
+updated_date: '2026-02-21 03:40'
+labels:
+  - architecture
+  - refactor
+  - maintainability
+dependencies:
+  - TASK-71
+  - TASK-85
+priority: high
+---
+
+## Description
+
+<!-- SECTION:DESCRIPTION:BEGIN -->
+`src/main.ts` still contains heavy deps-builder orchestration and high import concentration. Complete the composition-root refactor so `main.ts` owns boot wiring only and domain assembly moves behind registry/domain composer modules.
+<!-- SECTION:DESCRIPTION:END -->
+
+## Action Steps
+
+<!-- SECTION:PLAN:BEGIN -->
+1. Baseline current `main.ts` fan-in (`check:main-fanin`, `check:file-budgets`, `wc -l src/main.ts`).
+2. Introduce domain composer modules for repeated build-handler clusters (startup, overlay, jellyfin, anilist, ipc/shortcuts).
+3. Move `createBuild*MainDepsHandler` call clusters out of `main.ts` into domain composer modules with narrow typed inputs.
+4. Replace inline assembly in `main.ts` with single-call composer invocations per domain.
+5. Add/adjust unit tests for new composer modules to lock shape and wiring.
+6. Tighten `check:main-fanin` thresholds after refactor to prevent regression.
+7. Re-run full config/core test gates and update `TASK-71` progress.
+<!-- SECTION:PLAN:END -->
+
+## Progress Notes
+
+- 2026-02-21 baseline: `src/main.ts` = 3129 LOC; `check:main-fanin` = 105 import lines / 9 unique runtime paths.
+- 2026-02-21 extraction slice: added composer modules `src/main/runtime/composers/jellyfin-remote-composer.ts` and `src/main/runtime/composers/anilist-setup-composer.ts`; moved corresponding `createBuild*MainDepsHandler` orchestration out of `main.ts`.
+- 2026-02-21 tests: added focused composer shape tests at `src/main/runtime/composers/jellyfin-remote-composer.test.ts` and `src/main/runtime/composers/anilist-setup-composer.test.ts`.
+- 2026-02-21 guardrail tighten: `scripts/check-main-runtime-fanin.ts` defaults tightened to `import lines <= 110` and `unique runtime paths <= 11`.
+- 2026-02-21 post-slice metrics: `src/main.ts` = 3042 LOC; `check:main-fanin --strict` = 103 import lines / 11 unique runtime paths.
+- Remaining gap: startup/overlay/ipc/shortcuts composer extraction still required to fully meet thin composition-root target.
+
+## Acceptance Criteria
+<!-- AC:BEGIN -->
+- [ ] #1 `src/main.ts` is composition-focused (boot/runtime wiring only; no broad deps-builder clusters).
+- [x] #2 Runtime import paths in `src/main.ts` stay domain-registry oriented (no relapse to per-leaf runtime imports).
+- [x] #3 `check:main-fanin` passes under updated threshold.
+- [x] #4 `bun run test:core:dist` passes with no CLI/IPC behavior regressions.
+<!-- AC:END -->
+
+## Definition of Done
+<!-- DOD:BEGIN -->
+- [x] #1 `src/main.ts` LOC and fan-in metrics improve from pre-task baseline and are recorded in task notes.
+- [x] #2 New composer modules are covered by focused tests.
+- [x] #3 `TASK-71` and `TASK-85` progress notes reflect completed slice and remaining gap.
+<!-- DOD:END -->