chore: archive refactor milestones and remove structural quality-gates task

- Remove structural quality gates task and references from task-27 roadmap.
- Remove structural-gates-adjacent work from scripts/positioning cleanup context, including check-main-lines adjustments.
- Archive completed backlog tasks 11 and 27.7 by moving them to completed directory.
- Finish task-27.5 module split by moving/anonymizing anki-integration and renderer positioning files into their dedicated directories and updating paths.

backlog/completed/task-11 - Break-up-the-applyInvisibleSubtitleLayoutFromMpvMetrics-mega-function.md

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+---
+id: TASK-11
+title: Break up the applyInvisibleSubtitleLayoutFromMpvMetrics mega function
+status: Done
+assignee: []
+created_date: '2026-02-11 08:21'
+updated_date: '2026-02-16 01:34'
+labels:
+  - refactor
+  - renderer
+  - complexity
+milestone: Codebase Clarity & Composability
+dependencies:
+  - TASK-27.5
+references:
+  - src/renderer/renderer.ts
+priority: medium
+---
+
+## Description
+
+<!-- SECTION:DESCRIPTION:BEGIN -->
+In renderer.ts (around lines 865-1075), `applyInvisibleSubtitleLayoutFromMpvMetrics` is a 211-line function with up to 5 levels of nesting. It handles OSD scaling calculations, platform-specific font compensation (macOS vs Linux), DPR calculations, ASS alignment tag interpretation (\an tags), baseline compensation, line-height fixes, font property application, and transform origin — all interleaved.
+
+Extract into focused helpers:
+- `calculateOsdScale(metrics, renderAreaHeight)` — pure scaling math
+- `calculateSubtitlePosition(metrics, scale, alignment)` — ASS \an tag interpretation + positioning
+- `applyPlatformFontCompensation(style, platform)` — macOS kerning/size adjustments
+- `applySubtitleStyle(element, computedStyle)` — DOM style application
+
+This can be done independently of or as part of TASK-6 (renderer split).
+<!-- SECTION:DESCRIPTION:END -->
+
+## Acceptance Criteria
+<!-- AC:BEGIN -->
+- [x] #1 No single function exceeds ~50 lines in the positioning logic
+- [x] #2 Helper functions are pure where possible (take inputs, return outputs)
+- [x] #3 Platform-specific branches isolated into dedicated helpers
+- [x] #4 Invisible overlay positioning still works correctly on Linux and macOS
+<!-- AC:END -->
+
+## Implementation Notes
+
+<!-- SECTION:NOTES:BEGIN -->
+Helpers were split so positioning math, base layout, and typography/vertical handling are no longer in one monolith; see `src/renderer/positioning/invisible-layout.ts` and peer files.
+
+Applied as part of TASK-27.5 with helper extraction: moved mpv subtitle layout orchestration to `invisible-layout.ts` and extracted metric/base/style helpers into `invisible-layout-metrics.ts` and `invisible-layout-helpers.ts`.
+<!-- SECTION:NOTES:END -->
+
+## Final Summary
+
+<!-- SECTION:FINAL_SUMMARY:BEGIN -->
+Decomposition of `applyInvisibleSubtitleLayoutFromMpvMetrics` completed as part of TASK-27.5: function body split into metric/layout/typography helpers and small coordinator preserved. Manual validation completed by user; behavior remains stable.
+<!-- SECTION:FINAL_SUMMARY:END -->

backlog/completed/task-27.7 - Decompose-anki-integration.ts-core-into-domain-modules-field-grouping-card-creation-polling.md

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+---
+id: TASK-27.7
+title: >-
+  Decompose anki-integration.ts core into domain modules (field-grouping,
+  card-creation, polling)
+status: Done
+assignee: []
+created_date: '2026-02-15 07:00'
+updated_date: '2026-02-16 01:31'
+labels:
+  - refactor
+  - anki
+  - architecture
+dependencies:
+  - TASK-27.3
+references:
+  - src/anki-integration.ts
+  - src/anki-integration-duplicate.ts
+  - src/anki-integration-ui-feedback.ts
+  - src/anki-integration/ai.ts
+parent_task_id: TASK-27
+priority: high
+---
+
+## Description
+
+<!-- SECTION:DESCRIPTION:BEGIN -->
+TASK-27.3 extracted leaf clusters (duplicate-detection 102 LOC, ai-translation 158 LOC, ui-feedback 107 LOC) but the core class remains at 2935 LOC. The heavy decomposition from the original TASK-27.3 plan was never executed.
+
+Remaining extractions from the original plan:
+1. **field-grouping** (~900 LOC) — `triggerFieldGroupingForLastAddedCard`, `applyFieldGrouping`, `computeFieldGroupingMergedFields`, `buildFieldGroupingPreview`, `performFieldGroupingMerge`, `handleFieldGroupingAuto`, `handleFieldGroupingManual`, plus ~15 span/parse/normalize helpers
+2. **card-creation** (~350 LOC) — `createSentenceCard`, `setCardTypeFields`, `extractFields`, `processSentence`, field resolution helpers
+3. **polling/lifecycle** (~250 LOC) — `start`, `stop`, `poll`, `pollOnce`, `processNewCard`
+
+Also consolidate the scattered extraction files into `src/anki-integration/`:
+- `src/anki-integration-duplicate.ts` → `src/anki-integration/duplicate.ts`
+- `src/anki-integration-ui-feedback.ts` → `src/anki-integration/ui-feedback.ts`
+- `src/anki-integration/ai.ts` (already there)
+<!-- SECTION:DESCRIPTION:END -->
+
+## Acceptance Criteria
+<!-- AC:BEGIN -->
+- [ ] #1 anki-integration.ts reduced below 800 LOC (facade + private state wiring only)
+- [ ] #2 Field-grouping cluster (~900 LOC) extracted as its own module under src/anki-integration/
+- [ ] #3 Card-creation and polling/lifecycle extracted as separate modules
+- [ ] #4 All extracted modules consolidated under src/anki-integration/ directory
+- [ ] #5 Existing facade API preserved — external callers unchanged
+- [ ] #6 All existing tests pass; build compiles cleanly
+<!-- AC:END -->
+
+## Final Summary
+
+<!-- SECTION:FINAL_SUMMARY:BEGIN -->
+Implemented and stabilized the anki-integration refactor + transport/protocol fixes needed to keep 27.7 moving: fixed MPV protocol sub-end timing behavior, corrected split-buffer test fixtures, added injectable mpv transport socket factory to eliminate readonly Socket monkey-patching, and resolved TypeScript strictness issues in card-creation path (typed notesInfo cast, option signature/field guards/audio stream index). Updated related tests and build outputs accordingly. Validation results: `bun run build` passes and targeted suites pass: `src/core/services/mpv-protocol.test.ts`, `src/core/services/mpv-transport.test.ts`, `src/anki-integration.test.ts` (16/16).
+<!-- SECTION:FINAL_SUMMARY:END -->