build: switch Yomitan to submodule-built artifact

backlog/tasks/task-110 - Replace-vendored-Yomitan-with-submodule-built-chrome-artifact-workflow.md

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+---
+id: TASK-110
+title: Replace vendored Yomitan with submodule-built Chrome artifact workflow
+status: Done
+assignee: []
+created_date: '2026-03-07 11:05'
+updated_date: '2026-03-07 11:22'
+labels:
+  - yomitan
+  - build
+  - release
+dependencies: []
+priority: high
+ordinal: 9010
+---
+
+## Description
+
+<!-- SECTION:DESCRIPTION:BEGIN -->
+
+Replace the checked-in `vendor/yomitan` release tree with a `subminer-yomitan` git submodule. Build Yomitan from source, extract the Chromium zip artifact into a stable local build directory, and make SubMiner dev/runtime/tests/release packaging load that extracted extension instead of the source tree or vendored files.
+
+<!-- SECTION:DESCRIPTION:END -->
+
+## Acceptance Criteria
+
+<!-- AC:BEGIN -->
+
+- [x] #1 Repo tracks Yomitan as a git submodule instead of committed extension files under `vendor/yomitan`.
+- [x] #2 SubMiner has a reproducible build/extract step that produces a local Chromium extension directory from `subminer-yomitan`.
+- [x] #3 Dev/runtime/tests resolve the extracted build output as the default Yomitan extension path.
+- [x] #4 Release packaging includes the extracted Chromium extension files instead of the old vendored tree.
+- [x] #5 Docs and verification commands reflect the new workflow.
+
+<!-- AC:END -->
+
+## Final Summary
+
+<!-- SECTION:FINAL_SUMMARY:BEGIN -->
+
+Replaced the checked-in `vendor/yomitan` extension tree with a `vendor/subminer-yomitan` git submodule and added a reproducible `bun run build:yomitan` workflow that builds `yomitan-chrome.zip`, extracts it into `build/yomitan`, and reuses a source-state stamp to skip redundant rebuilds. Runtime path resolution, helper CLIs, Yomitan integration tests, packaging, CI cache keys, and README source-build notes now all target that generated artifact instead of the old vendored files.
+
+Verification:
+
+- `bun run build:yomitan`
+- `bun test src/core/services/yomitan-extension-paths.test.ts src/core/services/yomitan-structured-content-generator.test.ts src/yomitan-translator-sort.test.ts`
+- `bun run typecheck`
+- `bun run build`
+- `bun run test:core:src`
+
+<!-- SECTION:FINAL_SUMMARY:END -->