refactor(main): normalize runtime composer contracts

docs/subagents/agents/opencode-task97-runtime-composer-20260221T094150Z-r8k3.md

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+# Agent Session: opencode-task97-runtime-composer-20260221T094150Z-r8k3
+
+- alias: `opencode-task97-runtime-composer`
+- mission: `Execute TASK-97 normalize runtime composer contracts end-to-end without commit`
+- status: `done`
+- started_utc: `2026-02-21T09:42:20Z`
+- backlog_task: `TASK-97`
+
+## Intent
+
+- Load TASK-97 context from Backlog MCP.
+- Build execution plan via `writing-plans` skill.
+- Execute with `executing-plans` skill.
+- Use parallel subagents for independent slices.
+
+## Planned Files
+
+- `src/main/runtime/composers/*`
+- `src/main/runtime/*`
+- `src/main.ts`
+- `src/**/*.test.ts`
+- `docs/**/*.md`
+
+## Assumptions
+
+- Existing TASK-94/TASK-71 composer extraction is baseline.
+- No commit requested.
+
+## Heartbeat Log
+
+- `2026-02-21T09:42:20Z` session start; context load + planning pending.
+- `2026-02-21T10:06:59Z` implementation complete; TASK-97 marked Done in Backlog MCP.
+
+## Files Touched
+
+- `src/main/runtime/composers/contracts.ts`
+- `src/main/runtime/composers/index.ts`
+- `src/main/runtime/composers/anilist-setup-composer.ts`
+- `src/main/runtime/composers/anilist-tracking-composer.ts`
+- `src/main/runtime/composers/app-ready-composer.ts`
+- `src/main/runtime/composers/ipc-runtime-composer.ts`
+- `src/main/runtime/composers/jellyfin-remote-composer.ts`
+- `src/main/runtime/composers/mpv-runtime-composer.ts`
+- `src/main/runtime/composers/shortcuts-runtime-composer.ts`
+- `src/main/runtime/composers/startup-lifecycle-composer.ts`
+- `src/main/runtime/composers/ipc-runtime-composer.test.ts`
+- `src/main/runtime/composers/mpv-runtime-composer.test.ts`
+- `src/main/runtime/composers/composer-contracts.type-test.ts`
+- `src/main/runtime/mpv-client-runtime-service.ts`
+- `src/main.ts`
+- `docs/architecture.md`
+- `docs/development.md`
+- `docs/plans/2026-02-21-task-97-normalize-runtime-composer-contracts.md`
+
+## Verification
+
+- `bun run build` pass
+- `bun run build && node --test dist/main/runtime/composers/mpv-runtime-composer.test.js dist/main/runtime/composers/jellyfin-remote-composer.test.js dist/main/runtime/composers/ipc-runtime-composer.test.js` pass
+- `bun run check:main-fanin` pass (`86 import lines`, `10 unique runtime paths`)
+- `bun run test:core:dist` pass (`204 pass`, `10 skipped`)
+
+## Handoff
+
+- no commit performed (per task request)
+- TASK-97 acceptance criteria + DoD checked and status set to Done in Backlog MCP