refactor(main): introduce explicit AniList runtime transitions

docs/subagents/agents/opencode-task79-runtime-reducers-20260221T235652Z-n4p7.md

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+# Agent Session: opencode-task79-runtime-reducers-20260221T235652Z-n4p7
+
+- alias: `opencode-task79-runtime-reducers`
+- mission: `Execute TASK-79 explicit runtime state transitions/reducers in main via writing-plans + executing-plans (no commit).`
+- status: `done`
+- started_utc: `2026-02-21T23:56:52Z`
+- last_update_utc: `2026-02-22T00:10:51Z`
+
+## Intent
+
+- Load TASK-79 from Backlog MCP; capture plan in task.
+- Produce implementation plan doc under `docs/plans/`.
+- Execute code/test/docs updates end-to-end without commit.
+
+## Planned Files
+
+- `src/main.ts`
+- `src/main/state.ts`
+- `src/main/state.test.ts`
+
+## Assumptions
+
+- Backlog task `TASK-79` exists and is ready for execution.
+- Existing startup/IPC/overlay behavior must remain unchanged.
+- Parallel subagents can own independent slices (state domains/tests/docs) without overlap.
+
+## Phase Log
+
+- `2026-02-21T23:56:52Z` Started; loaded backlog overview + TASK-79 context; beginning planning.
+- `2026-02-22T00:06:10Z` Slice A implementation: added explicit AniList state transition helpers + initializers in `src/main/state.ts`; rewired migrated `src/main.ts` AniList writes through transitions; added focused reducer tests in `src/main/state.test.ts`; focused `bun test src/main/state.test.ts` blocked by Bun runtime missing `node:sqlite`.
+- `2026-02-22T00:10:51Z` Finalized TASK-79: switched `state.ts` import to direct `mpv-render-metrics` module (removes `node:sqlite` test coupling), focused state/anilist invariant tests passing, build + `test:core:src` passing, backlog TASK-79 marked Done.