feat(fs): W4-E4 fsproxy hang isolation, partial sweep, replace-with-verify, TIMEOUT retry

- adapters/fs: FsProxy + fsworker run each file op in a killable subprocess;
  progress-stall watchdog (FS_HANG_TIMEOUT_MS) for copy/hash, total timeout for
  quick ops; SIGTERM -> SIGKILL -> FsError('TIMEOUT'); stat/checkRoot timeouts
  never read as missing
- copyWithVerify: onExisting conflict/skip/replace (hardlink backup + atomic
  rename, old file to .umt-trash or deleted), sweep stale partials before write,
  document why permissions/owner are not copied
- filesMatch/filesMatchSha256 throw FsError on read failure instead of
  match=false; crossDeviceMove skips redundant re-hash after sha256 copy
- FsErrorCode TIMEOUT + fsErrorClass; organize executeRecord routes fs ops
  through fsproxy, retries TIMEOUT/IO up to FS_TRANSFER_MAX_ATTEMPTS then opens
  a decision without deleting the record; reconcile errors no longer reported
  as EEXIST
- domain: subtitle .default marker (ORGANIZE_DEFAULT_SUBTITLE_LANG) and
  findOtherVersions (same season/episode/part, video only) as upgrade
  disposal candidates
- scripts/bench/fs-bench.ts and benchmark record in porting doc

Co-Authored-By: Claude Opus 5.5 <[email protected]>

packages/domain/test/organize.test.ts

@@ -1,5 +1,11 @@
 import { describe, expect, it } from "vitest";
-import { type OrganizeInput, planOrganize, sidecarLanguageSuffix, sidecarStem } from "../src/index.ts";
+import {
+  findOtherVersions,
+  type OrganizeInput,
+  planOrganize,
+  sidecarLanguageSuffix,
+  sidecarStem,
+} from "../src/index.ts";
 
 const MiB = 1024 ** 2;
 const GiB = 1024 ** 3;
@@ -236,3 +242,55 @@ describe("附属文件主干名", () => {
     expect(sidecarLanguageSuffix([])).toBe("");
   });
 });
+
+describe("W4-E4:字幕 .default 与 latest 旧版本判定口径(对照 MP)", () => {
+  it("defaultLang 命中的随行字幕加 .default;源自带 .default 保留;不命中不加", () => {
+    expect(sidecarLanguageSuffix(["chs"], "zh-cn")).toBe(".chi.zh-cn.default");
+    expect(sidecarLanguageSuffix(["cht"], "zh-cn")).toBe(".zh-tw");
+    expect(sidecarLanguageSuffix(["eng"], "en")).toBe(".eng.default");
+    expect(sidecarLanguageSuffix(["eng", "default"])).toBe(".eng.default");
+    expect(sidecarLanguageSuffix([], "zh-cn")).toBe("");
+  });
+
+  it("planOrganize 透传 defaultSubtitleLang", () => {
+    const plan = planOrganize({
+      operation: "copy",
+      mediaType: "movie",
+      files: [
+        { path: "/dl/Movie.2020.1080p.BluRay.x264-GRP.mkv", size: 2e9 },
+        { path: "/dl/Movie.2020.1080p.BluRay.x264-GRP.chs.srt", size: 1e4 },
+        { path: "/dl/Movie.2020.1080p.BluRay.x264-GRP.eng.srt", size: 1e4 },
+      ],
+      entity: { title: "Movie", year: 2020 },
+      target: { movieDir: "/lib/Movie (2020)" },
+      defaultSubtitleLang: "zh-cn",
+    });
+    const subs = plan.files.filter((f) => f.role === "sidecar").map((f) => f.dst.split("/").pop());
+    expect(subs.some((n) => n?.endsWith(".chi.zh-cn.default.srt"))).toBe(true);
+    expect(subs.some((n) => n?.endsWith(".eng.srt"))).toBe(true);
+  });
+
+  it("findOtherVersions:同季同集同 Part、只看视频扩展名", () => {
+    const sib = [
+      "/lib/S01/Show - S01E01 - 1080p.mkv",
+      "/lib/S01/Show - S01E01 - 2160p.mkv",
+      "/lib/S01/Show - S01E01 - 2160p.chi.zh-cn.srt",
+      "/lib/S01/Show - S01E01 - 720p.mp4",
+      "/lib/S01/Show - S01E02 - 1080p.mkv",
+      "/lib/S01/Show - S01E01 - 1080p.nfo",
+    ];
+    expect(findOtherVersions("/lib/S01/Show - S01E01 - 2160p.mkv", sib).sort()).toEqual([
+      "/lib/S01/Show - S01E01 - 1080p.mkv",
+      "/lib/S01/Show - S01E01 - 720p.mp4",
+    ]);
+    expect(findOtherVersions("/lib/S01/Show - S01E01 - 2160p.chi.zh-cn.srt", sib)).toEqual([]);
+    const movie = [
+      "/lib/M (2020)/M (2020) - 1080p.mkv",
+      "/lib/M (2020)/M (2020) - 2160p.mkv",
+      "/lib/M (2020)/M (2020) - 1080p.srt",
+    ];
+    expect(findOtherVersions("/lib/M (2020)/M (2020) - 2160p.mkv", movie)).toEqual([
+      "/lib/M (2020)/M (2020) - 1080p.mkv",
+    ]);
+  });
+});