Complete runtime service follow-ups and invisible subtitle edit mode

backlog/tasks/task-2 - Post-refactor-follow-ups-from-investigation.md.md

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+---
+id: TASK-2
+title: Post-refactor follow-ups from investigation.md
+status: Done
+assignee:
+  - codex
+created_date: '2026-02-10 18:56'
+updated_date: '2026-02-11 03:35'
+labels: []
+dependencies:
+  - TASK-1
+references:
+  - investigation.md
+  - docs/refactor-main-checklist.md
+ordinal: 13000
+---
+
+## Description
+
+<!-- SECTION:DESCRIPTION:BEGIN -->
+Execute the remaining follow-up work identified in investigation.md: remove unused scaffolding, add tests for high-risk consolidated services, and run manual smoke validation in a desktop MPV session.
+<!-- SECTION:DESCRIPTION:END -->
+
+## Acceptance Criteria
+<!-- AC:BEGIN -->
+- [x] #1 Follow-up subtasks are created with explicit scope and dependencies.
+- [x] #2 Unused architectural scaffolding and abandoned IPC abstraction files are removed or explicitly retained with documented rationale.
+- [x] #3 Dedicated tests are added for higher-risk consolidated services (`overlay-shortcut-handler`, `mining-service`, `anki-jimaku-service`).
+- [x] #4 Manual smoke checks for overlay rendering, mining flow, and field-grouping interaction are executed and results documented.
+<!-- AC:END -->
+
+## Implementation Plan
+
+<!-- SECTION:PLAN:BEGIN -->
+1. Create scoped subtasks for each recommendation in investigation.md and sequence them by risk and execution constraints.
+2. Remove dead scaffolding files and any now-unneeded exports/imports; verify build/tests remain green.
+3. Add focused behavior tests for the three higher-risk consolidated services.
+4. Run and document desktop smoke validation in an MPV-enabled environment.
+<!-- SECTION:PLAN:END -->
+
+## Implementation Notes
+
+<!-- SECTION:NOTES:BEGIN -->
+Completed:
+- Created TASK-2.1 through TASK-2.5 from `investigation.md` recommendations.
+- Finished TASK-2.1: removed unused scaffolding in `src/core/`, `src/modules/`, `src/ipc/` and cleaned internal-only service barrel export.
+- Finished TASK-2.2: added dedicated tests for `overlay-shortcut-handler.ts`.
+- Finished TASK-2.3: added dedicated tests for `mining-service.ts`.
+- Finished TASK-2.4: added dedicated tests for `anki-jimaku-service.ts`.
+
+Remaining:
+- TASK-2.5: desktop smoke validation with MPV session
+<!-- SECTION:NOTES:END -->