diff --git a/.github/workflows/release-source.yml b/.github/workflows/release-source.yml
index 410dd0466..2b7e08951 100644
--- a/.github/workflows/release-source.yml
+++ b/.github/workflows/release-source.yml
@@ -1,11 +1,12 @@
 name: Source Package Release
 run-name: Source Package Release${{ !(startsWith(github.ref, 'refs/tags/') || inputs.release_tag != '') && ' (build only)' || '' }}
 
-# Builds the trimmed C++ source package (opencc profile: no Node.js, Python,
-# documentation, or packaging files) and attaches it to the release. The
-# trimmed package keeps both build systems working, so it is smoke-tested with
-# CMake and Bazel before upload. Like the other release workflows it uploads to
-# the draft created by release-draft.yml; publishing is manual.
+# Builds the trimmed C++ source package (opencc profile: includes the Jieba
+# segmentation plugin but excludes Node.js, Python, documentation, or packaging
+# files) and attaches it to the release. The trimmed package keeps both build
+# systems working, so it is smoke-tested with CMake and Bazel before upload.
+# Like the other release workflows it uploads to the draft created by
+# release-draft.yml; publishing is manual.
 
 on:
   workflow_dispatch:
@@ -45,10 +46,20 @@ jobs:
 
       - name: Build trimmed source package
         run: |
-          cmake -S . -B build-src -DOPENCC_SOURCE_PACKAGE_PROFILE=opencc
+          cmake -S . -B build-src \
+            -DOPENCC_SOURCE_PACKAGE_PROFILE=opencc \
+            -DCPACK_SOURCE_ARCHIVE_TIMESTAMP=0
           (cd build-src && cpack --config CPackSourceConfig.cmake -G TGZ)
+          # Repack for reproducibility: normalize ownership (root:root),
+          # timestamps (epoch 0), and file order (sorted).
+          cpack_tarball=$(ls build-src/opencc-*-opencc-src.tar.gz)
+          base=$(basename "$cpack_tarball" .tar.gz)
+          tmpdir=$(mktemp -d)
+          tar xzf "$cpack_tarball" -C "$tmpdir"
           mkdir -p dist
-          mv build-src/opencc-*-opencc-src.tar.gz dist/
+          tar cf - -C "$tmpdir" --sort=name --owner=root --group=root --mtime=@0 "$base" | gzip -9n > "dist/${base}.tar.gz"
+          tar cf - -C "$tmpdir" --sort=name --owner=root --group=root --mtime=@0 "$base" | xz -9 > "dist/${base}.tar.xz"
+          rm -rf "$tmpdir"
           ls -l dist/
 
       - name: Smoke-test the package (CMake and Bazel)
@@ -58,17 +69,17 @@ jobs:
           workdir=$(mktemp -d)
           tar xzf "$tarball" -C "$workdir"
           src=$(echo "$workdir"/opencc-*-opencc-src)
-          # CMake: configure and build the core library and CLI tools.
-          cmake -S "$src" -B "$src/build" -DCMAKE_BUILD_TYPE=Release
-          cmake --build "$src/build" --target opencc opencc_dict --parallel
-          # Bazel: load, analyze, and build the core targets. Catches a trimmed
+          # CMake: configure and build the core library, CLI tools, and Jieba plugin.
+          cmake -S "$src" -B "$src/build" -DCMAKE_BUILD_TYPE=Release -DBUILD_OPENCC_JIEBA_PLUGIN=ON
+          cmake --build "$src/build" --target opencc opencc_dict opencc-jieba --parallel
+          # Bazel: build the core and Jieba plugin targets. Catches a trimmed
           # package that dropped a file the Bazel module or BUILD graph needs.
-          (cd "$src" && bazel build //src/tools:dict_converter //data/dictionary:binary_dictionaries)
+          (cd "$src" && bazel build //src/tools:dict_converter //data/dictionary:binary_dictionaries //plugins/jieba:opencc-jieba)
 
       - uses: actions/upload-artifact@v4
         with:
           name: opencc-source-package
-          path: dist/opencc-*-opencc-src.tar.gz
+          path: dist/opencc-*-opencc-src.tar.*
 
       - name: Upload to GitHub release
         if: startsWith(github.ref, 'refs/tags/') || inputs.release_tag != ''
@@ -83,4 +94,5 @@ jobs:
           done
           gh release upload "$tag" \
             dist/opencc-*-opencc-src.tar.gz \
+            dist/opencc-*-opencc-src.tar.xz \
             --clobber
diff --git a/AGENTS.md b/AGENTS.md
index 5158bf9cd..7552717aa 100644
--- a/AGENTS.md
+++ b/AGENTS.md
@@ -54,7 +54,7 @@ This document compiles the Open Chinese Convert (OpenCC) project information to
 ## Optional Plugin and Release Packaging
 - `BUILD_OPENCC_JIEBA_PLUGIN` enables the C++ jieba plugin in CMake builds. Since 1.4.1 it defaults to ON for top-level macOS builds (so Homebrew ships the plugin); other platforms, subproject builds (FetchContent / `add_subdirectory`), and Python wheel builds keep it OFF.
 - The merged jieba dictionary (`jieba_dict/jieba_merged.ocd2`) is generated at build time by `opencc_dict --from cppjieba_utf8`; there is no separate dictionary helper tool. Standalone plugin builds locate an installed `opencc_dict` and require OpenCC >= 1.4.1.
-- Source packages: `OPENCC_SOURCE_PACKAGE_PROFILE` (`full` / `opencc` / `opencc-jieba`) selects which CPack source archive is produced. The `opencc` profile is the trimmed C++-only package (no Node.js, Python, docs, packaging, or `plugins/`) and is intentionally buildable with **both** CMake and Bazel, so Bazel workspace files (`BUILD.bazel`, `MODULE.bazel[.lock]`, `.bazelrc`, `.bazelversion`, `.bazelignore`) and the top-level `patches/` directory (referenced by `MODULE.bazel`) are kept; only `.bazelrc.user` is dropped. When editing the trimmed ignore list, do not re-exclude Bazel files or `patches/`. `release-source.yml` builds this package on a `ver.*` tag (or `workflow_dispatch` with `release_tag`), smoke-tests it with CMake and Bazel, and uploads it to the draft release.
+- Source packages: `OPENCC_SOURCE_PACKAGE_PROFILE` (`full` / `opencc`) selects which CPack source archive is produced. The `opencc` profile is the trimmed C++ package including the Jieba plugin (no Node.js, Python, docs, or packaging files) and is intentionally buildable with **both** CMake and Bazel, so Bazel workspace files (`BUILD.bazel`, `MODULE.bazel[.lock]`, `.bazelrc`, `.bazelversion`, `.bazelignore`) and the top-level `patches/` directory (referenced by `MODULE.bazel`) are kept; only `.bazelrc.user` is dropped. When editing the trimmed ignore list, do not re-exclude Bazel files or `patches/`. `release-source.yml` builds this package on a `ver.*` tag (or `workflow_dispatch` with `release_tag`), smoke-tests it with CMake and Bazel (including the Jieba plugin), repacks it for reproducibility (normalized ownership, epoch-0 timestamps, sorted entries), and uploads `.tar.gz` and `.tar.xz` to the draft release.
 - `plugins/README.md` documents plugin loading, ABI expectations, and standalone plugin builds.
 - `scripts/release-windows-winget.ps1` is the Windows portable/WinGet release path and produces the CLI zip, checksum, and WinGet manifests.
 - npm release packaging is separate from the native CLI release: `opencc` and `opencc-jieba` are packed as npm `.tgz` artifacts and should be install-tested together when plugin-backed npm configs are changed.
diff --git a/CMakeLists.txt b/CMakeLists.txt
index ae5573caa..d8b288077 100644
--- a/CMakeLists.txt
+++ b/CMakeLists.txt
@@ -52,9 +52,9 @@ option(ENABLE_BENCHMARK "Build benchmark tests." OFF)
 # Top-level macOS builds enable the Jieba plugin by default so package
 # managers that build with default options (e.g. Homebrew) ship it. Other
 # platforms and subproject builds (FetchContent / add_subdirectory) keep it
-# opt-in. Trimmed source packages ship without plugins/, so only default to
-# ON when the plugin sources are actually present; an explicit
-# -DBUILD_OPENCC_JIEBA_PLUGIN=ON without them still fails loudly below.
+# opt-in. Only default to ON when the plugin sources are actually present;
+# an explicit -DBUILD_OPENCC_JIEBA_PLUGIN=ON without them still fails
+# loudly below.
 if (APPLE AND CMAKE_SOURCE_DIR STREQUAL CMAKE_CURRENT_SOURCE_DIR
     AND EXISTS "${CMAKE_CURRENT_SOURCE_DIR}/plugins/CMakeLists.txt")
   set(OPENCC_JIEBA_PLUGIN_DEFAULT ON)
@@ -83,8 +83,8 @@ option(USE_SYSTEM_MARISA "Use system version of Marisa" OFF)
 option(USE_SYSTEM_PYBIND11 "Use system version of pybind11" OFF)
 option(USE_SYSTEM_RAPIDJSON "Use system version of RapidJSON" OFF)
 option(USE_SYSTEM_TCLAP "Use system version of TCLAP" OFF)
-set(OPENCC_SOURCE_PACKAGE_PROFILE "full" CACHE STRING "Source package profile: full, opencc, or opencc-jieba")
-set_property(CACHE OPENCC_SOURCE_PACKAGE_PROFILE PROPERTY STRINGS full opencc opencc-jieba)
+set(OPENCC_SOURCE_PACKAGE_PROFILE "full" CACHE STRING "Source package profile: full or opencc")
+set_property(CACHE OPENCC_SOURCE_PACKAGE_PROFILE PROPERTY STRINGS full opencc)
 
 ######## Package information
 set (PACKAGE_URL https://github.com/BYVoid/OpenCC)
@@ -136,20 +136,12 @@ set(_OPENCC_TRIMMED_SOURCE_PACKAGE_IGNORE_FILES
 )
 if(OPENCC_SOURCE_PACKAGE_PROFILE STREQUAL "opencc")
   set(_OPENCC_SOURCE_PACKAGE_SUFFIX "-opencc-src")
-  set(_OPENCC_SOURCE_PACKAGE_IGNORE_FILES
-    ${_OPENCC_TRIMMED_SOURCE_PACKAGE_IGNORE_FILES}
-    "/plugins/"
-  )
-elseif(OPENCC_SOURCE_PACKAGE_PROFILE STREQUAL "opencc-jieba")
-  set(CPACK_SOURCE_PACKAGE_FILE_NAME
-    "opencc-jieba-${OPENCC_VERSION_MAJOR}.${OPENCC_VERSION_MINOR}.${OPENCC_VERSION_REVISION}-src"
-  )
   set(_OPENCC_SOURCE_PACKAGE_IGNORE_FILES
     ${_OPENCC_TRIMMED_SOURCE_PACKAGE_IGNORE_FILES}
     "/plugins/jieba/node/"
   )
 elseif(NOT OPENCC_SOURCE_PACKAGE_PROFILE STREQUAL "full")
-  message(FATAL_ERROR "OPENCC_SOURCE_PACKAGE_PROFILE must be 'full', 'opencc', or 'opencc-jieba'.")
+  message(FATAL_ERROR "OPENCC_SOURCE_PACKAGE_PROFILE must be 'full' or 'opencc'.")
 endif()
 
 if(NOT CPACK_SOURCE_PACKAGE_FILE_NAME)
@@ -158,7 +150,7 @@ if(NOT CPACK_SOURCE_PACKAGE_FILE_NAME)
   )
 endif()
 set(CPACK_SOURCE_IGNORE_FILES
-  "/build[^/]*/;/test/dict.ocd;/test/dict.txt;/test/dict.bin;/dict.ocd;/.DS_Store;/.zig-[^/]*/;/dist[^/]*/;/other/;/opencc.xcodeproj/;/.git/;.gitignore;~$;.pyc;/bazel-[^/]*;/.bazelrc.user;/node_modules;/.github;/.pytest_cache;/.vscode;/packaging/;${_OPENCC_SOURCE_PACKAGE_IGNORE_FILES};${CPACK_SOURCE_IGNORE_FILES}"
+  "/build[^/]*/;/test/dict.ocd;/test/dict.txt;/test/dict.bin;/dict.ocd;/.DS_Store;/.zig-[^/]*/;/dist[^/]*/;/other/;/opencc.xcodeproj/;/.git/;.gitattributes;.gitignore;.gitmodules;~$;.pyc;/bazel-[^/]*;/.bazelrc.user;/node_modules;/.github;/.pytest_cache;/.vscode;/packaging/;${_OPENCC_SOURCE_PACKAGE_IGNORE_FILES};${CPACK_SOURCE_IGNORE_FILES}"
 )
 include(CPack)
 
diff --git a/NEWS.md b/NEWS.md
index 3e44fe4d2..c64c82eae 100644
--- a/NEWS.md
+++ b/NEWS.md
@@ -29,7 +29,7 @@
     * `packaging/debian/` 同步至 Debian 的 `1.4.1+ds1-8`。Debian 已採納上游先前提出的 jieba 插件打包提案（拆為 `opencc-jieba` 與 arch:all 的 `opencc-jieba-data` 兩個套件，內嵌 cppjieba 的理由記於 `debian/README.source`）；Debian 端亦重新啟用了 autopkgtest。`packaging/debian/SPLIT_PROPOSAL.md` 隨提案落地移除。另外 `1.4.1+ds1-8` 修復了 `.ocd2` 被放進 `Architecture: all` 套件的問題：`.ocd2` 是依主機位元組序寫出的 marisa-trie 映像，所有架構都會拿到 arch:all buildd 上構建的小端序副本，opencc 在 s390x 上因而以 `size > avail_` 失敗（Debian bug [#1145010](https://bugs.debian.org/1145010)，由重新啟用的 s390x autopkgtest 揪出）。`*.ocd2` 已移回 arch:any 的 `libopencc1.4`、`jieba_merged.ocd2` 移回 arch:any 的 `opencc-jieba`；`libopencc-data` 與 `opencc-jieba-data` 現在只含 JSON 配置與純文字 jieba 詞典來源。
     * Debian 套件構建改在 `debian:sid` 容器中進行（同步來的打包以 unstable 為目標，Ubuntu LTS runner 無法滿足），並在 `dpkg-buildpackage` 前套用 `debian/patches` quilt series（自動跳過已在樹中的補丁）；arm64 改用 `ubuntu-24.04-arm` runner 原生構建，取代先前的交叉構建（[#1420](https://github.com/BYVoid/OpenCC/pull/1420)）。
     * 新增 `packaging/freebsd/`：FreeBSD ports tree `chinese/opencc` 條目的參考副本，供上游審閱與準備提交給 port maintainer 的改動。
-    * 新增精簡 C++ 源碼包發佈流程（`release-source.yml`）：以 `OPENCC_SOURCE_PACKAGE_PROFILE=opencc` 產生僅含 C++ 核心的 CPack 壓縮包（不含 Node.js、Python、文檔、packaging 與 plugins），並以 CMake 與 Bazel 雙路徑冒煙測試後上傳至 draft release；為此保留 Bazel workspace 檔案與頂層 `patches/`，僅排除可能含 API key 的 `.bazelrc.user`。
+    * 新增精簡 C++ 源碼包發佈流程（`release-source.yml`）：以 `OPENCC_SOURCE_PACKAGE_PROFILE=opencc` 產生含 C++ 核心與 Jieba 插件的 CPack 壓縮包（不含 Node.js、Python、文檔與 packaging），並以 CMake 與 Bazel 雙路徑冒煙測試（含 Jieba 插件建置）後，重新打包以正規化檔案擁有者、時間戳與排序，產生 `.tar.gz` 與 `.tar.xz` 上傳至 draft release；為此保留 Bazel workspace 檔案與頂層 `patches/`，僅排除可能含 API key 的 `.bazelrc.user`。
     * 修正 `cmake/GitVersion.cmake` 的 fallback 版本號：1.4.1 發佈時仍停留在 1.4.0，導致從釋出的 tarball（無 git 資訊）構建時版本回報為 1.4.0；本次發佈同步將其更新至 1.4.2，並讓 `scripts/compute-version.sh` 的 fallback 與之一致（先前停留在 1.2.1）。因此 Debian 打包的 `0010-fix-git-version-fallback.patch` 對 1.4.2 已無作用而移除，`0012-fix-legacy-dict-detection-on-big-endian.patch` 亦已包含於本次發佈。
     * Windows 發佈自本版起啟用程式碼簽章憑證：可攜式 CLI 壓縮包中的執行檔，以及 win32-x64 npm 二進位（`opencc.node`、`opencc-jieba.dll`）皆經 Authenticode 簽章，簽章服務由 [SignPath.io](https://about.signpath.io/) 免費提供、憑證由 [SignPath Foundation](https://signpath.org/) 免費提供，發佈流程改用其 release-signing policy；相關聲明與簽章／隱私政策見 README 的「Code Signing 程式碼簽章」一節（[#1458](https://github.com/BYVoid/OpenCC/pull/1458), [#1459](https://github.com/BYVoid/OpenCC/pull/1459)）。
 * **測試**：