fix: allow missing git in yomitan build; clean up README formatting

- Guard `getSourceState()` with `SUBMINER_YOMITAN_ALLOW_MISSING_GIT=1` escape hatch for environments without a git submodule
- Fix README requirements table column alignment and remove stray horizontal rule
- Update task-268 with follow-up CodeRabbit round notes and final summary

README.md

@@ -109,7 +109,7 @@ Browse sibling episode files and the active mpv queue in one overlay modal. Open
 ## Requirements
 
 |                | Required                                | Optional                                                   |
-| -------------- | --------------------------------------- | -------------------------------------- |
+| -------------- | --------------------------------------- | ---------------------------------------------------------- |
 | **Player**     | [`mpv`](https://mpv.io) with IPC socket | —                                                          |
 | **Processing** | `ffmpeg`, `mecab` + `mecab-ipadic`      | `guessit` (AniSkip), `alass` / `ffsubsync` (subtitle sync) |
 | **Media**      | —                                       | `yt-dlp`, `chafa`, `ffmpegthumbnailer`                     |
@@ -236,8 +236,6 @@ subminer stats -b           # stats daemon in background
 subminer stats -s           # stop background stats daemon
 ```
 
----
-
 ## Documentation
 
 Full guides on configuration, Anki setup, Jellyfin, immersion tracking, and more: **[docs.subminer.moe](https://docs.subminer.moe)**

backlog/tasks/task-268 - Address-CodeRabbit-review-action-items-for-PR-38.md

@@ -4,7 +4,7 @@ title: 'Address CodeRabbit review action items for PR #38'
 status: Done
 assignee: []
 created_date: '2026-04-01 05:35'
-updated_date: '2026-04-01 05:40'
+updated_date: '2026-04-01 06:07'
 labels:
   - pr-review
   - coderabbit
@@ -27,8 +27,18 @@ Review unresolved CodeRabbit feedback on PR #38 and implement the actionable fix
 - [x] #3 Relevant local verification for the affected areas passes.
 <!-- AC:END -->
 
+## Implementation Notes
+
+<!-- SECTION:NOTES:BEGIN -->
+2026-04-01: Reopened for follow-up CodeRabbit round after commit 233bde58. Remaining actionable items: guard maxMatches <= 0 in duplicate exact-match helper and strengthen the duplicate tracking test fixture to prove deduplication as well as sorting.
+
+2026-04-01: Follow-up round addressed locally. Added guard for maxMatches <= 0 in duplicate exact-match scanning and strengthened the pre-add duplicate tracking test fixture to prove deduplication as well as sorting.
+<!-- SECTION:NOTES:END -->
+
 ## Final Summary
 
 <!-- SECTION:FINAL_SUMMARY:BEGIN -->
 Addressed all unresolved actionable CodeRabbit comments on PR #38. Fixed duplicate tracking so empty duplicate lists are not persisted after sentence-card creation, sanitized Yomitan add-note noteId values to accept only positive integers, preserved paused playback for configured subtitle-seek keybindings when pause state is unknown, and short-circuited duplicate exact-match scanning for single-result lookups. Added regression tests for each case and verified with `bun test` on the affected suites plus `bun run typecheck`, `bun run test:fast`, `bun run test:env`, `bun run build`, and `bun run test:smoke:dist`.
+
+Follow-up CodeRabbit round addressed locally: `findExactDuplicateNoteIds()` now returns early when `maxMatches <= 0`, and the sentence-card duplicate tracking regression test now uses a repeated duplicate ID to assert deduplication plus sorting. Re-verified with targeted duplicate/card tests, `bun run typecheck`, and `bun run test:fast`.
 <!-- SECTION:FINAL_SUMMARY:END -->

scripts/build-yomitan.mjs

@@ -51,9 +51,16 @@ function ensureSubmodulePresent() {
 }
 
 function getSourceState() {
+  try {
     const revision = readCommand('git', ['rev-parse', 'HEAD'], submoduleDir);
     const dirty = readCommand('git', ['status', '--short', '--untracked-files=no'], submoduleDir);
     return { revision, dirty };
+  } catch (error) {
+    if (process.env.SUBMINER_YOMITAN_ALLOW_MISSING_GIT === '1') {
+      return { revision: 'unknown', dirty: '' };
+    }
+    throw error;
+  }
 }
 
 function isBuildCurrent(force) {