chore: remove xmake, clean up unused files, simplify CLI parsing (#392)

## Summary
- **Remove xmake build system**: delete `xmake.lua`, `test-xmake.yml`
workflow, and all xmake-related pixi tasks
- **Migrate packaging to CMake**: `publish-clice.yml` now uses `cmake
-DCLICE_RELEASE=ON` instead of xmake pack
- **Clean up**: remove unused `tests/uv.lock`, `.xmake/` from
`.gitignore`, xmake references from docs
- **Benchmark CI**: change trigger from `pull_request` to
`workflow_dispatch` (manual only)
- **Simplify CLI parsing**: use `DecoKV(style =
KVStyle::JoinedOrSeparate)` in `clice.cc` and `unit_tests.cc`, replacing
verbose `DecoKVStyled` with manual `static_cast` bitmask; use comma
separators; explicit `names` only for underscore fields

## Test plan
- [x] `pixi run cmake-build RelWithDebInfo` compiles successfully
- [x] Verify `pixi run test` passes
- [x] Verify `pixi run package` produces correct archives via CMake
release build
- [x] Verify benchmark workflow can be triggered manually via `gh
workflow run benchmark`

🤖 Generated with [Claude Code](https://claude.com/claude-code)

<!-- This is an auto-generated comment: release notes by coderabbit.ai
-->

## Summary by CodeRabbit

* **Chores**
* Consolidated CI workflows; some automated triggers converted to manual
invocation
* Standardized shell for workflow steps and removed legacy build
workflow
* Switched packaging/build tasks to a CMake/Ninja flow and updated
artifact paths
  * Adjusted ignore rules to include previously-ignored build metadata

* **Documentation**
* Removed XMake-specific build and test instructions; docs now reflect
the CMake-based workflow

* **Style**
* Updated CLI option declaration style (no user-facing flag name
changes)

<!-- end of auto-generated comment: release notes by coderabbit.ai -->

---------

Co-authored-by: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

.github/workflows/benchmark.yml

@@ -1,8 +1,7 @@
 name: benchmark
 
 on:
-  pull_request:
-    branches: [main]
+  workflow_dispatch:
 
 jobs:
   benchmark:

.github/workflows/main.yml

@@ -19,7 +19,7 @@ jobs:
       clice: ${{ steps.filter.outputs.clice }}
       vscode: ${{ steps.filter.outputs.vscode }}
       cmake: ${{ steps.filter.outputs.cmake }}
-      xmake: ${{ steps.filter.outputs.xmake }}
+
     steps:
       - uses: actions/checkout@v4
       - uses: dorny/paths-filter@v3
@@ -46,13 +46,6 @@ jobs:
               - 'tests/**'
               - 'config/**'
               - '.github/workflows/test-cmake.yml'
-            xmake:
-              - 'xmake.lua'
-              - 'src/**'
-              - 'include/**'
-              - 'tests/**'
-              - 'config/**'
-              - '.github/workflows/test-xmake.yml'
 
   format:
     needs: changes
@@ -82,11 +75,6 @@ jobs:
     if: ${{ needs.changes.outputs.cmake == 'true' }}
     uses: ./.github/workflows/test-cmake.yml
 
-  # xmake:
-  #   needs: changes
-  #   if: ${{ needs.changes.outputs.xmake == 'true' }}
-  #   uses: ./.github/workflows/test-xmake.yml
-
   release-clice:
     permissions:
       contents: write
@@ -109,11 +97,11 @@ jobs:
       # - clice
       - vscode
       - cmake
-      # - xmake
+
     runs-on: ubuntu-latest
     steps:
       - name: Check results
         uses: re-actors/alls-green@release/v1
         with:
-          allowed-skips: format,deploy,clice,vscode,cmake,xmake
+          allowed-skips: format,deploy,clice,vscode,cmake
           jobs: ${{ toJSON(needs) }}

.github/workflows/publish-clice.yml

@@ -29,32 +29,18 @@ jobs:
 
     runs-on: ${{ matrix.os }}
 
+    defaults:
+      run:
+        shell: bash
+
     steps:
       - name: Checkout repository
         uses: actions/checkout@v4
 
-      - name: Setup xmake
-        uses: xmake-io/github-action-setup-xmake@v1
-        with:
-          xmake-version: 3.0.5
-          actions-cache-folder: ".xmake-cache"
-          actions-cache-key: ${{ matrix.os }}
-          package-cache: true
-          package-cache-key: ${{ matrix.os }}-pkg-release-v1
-          build-cache: true
-          build-cache-key: ${{ matrix.os }}-build-release-v1
-
       - uses: ./.github/actions/setup-pixi
         with:
           environments: package
 
-      - name: Remove ci llvm toolchain on Windows
-        if: runner.os == 'Windows'
-        run: |
-          # @see https://github.com/xmake-io/xmake/issues/7158
-          xmake lua os.rmdir "C:/Program Files/Microsoft Visual Studio/2022/Enterprise/VC/Tools/Llvm"
-          xmake lua os.rmdir "C:/Program Files/LLVM"
-
       - name: Package
         run: pixi run package
 
@@ -63,7 +49,7 @@ jobs:
         uses: svenstaro/upload-release-action@v2
         with:
           repo_token: ${{ secrets.GITHUB_TOKEN }}
-          file: build/xpack/clice/${{ matrix.artifact_name }}
+          file: build/RelWithDebInfo/${{ matrix.artifact_name }}
           asset_name: ${{ matrix.asset_name }}
           tag: ${{ github.ref }}
           overwrite: true
@@ -73,7 +59,7 @@ jobs:
         uses: svenstaro/upload-release-action@v2
         with:
           repo_token: ${{ secrets.GITHUB_TOKEN }}
-          file: build/xpack/clice/${{ matrix.symbol_artifact_name }}
+          file: build/RelWithDebInfo/${{ matrix.symbol_artifact_name }}
           asset_name: ${{ matrix.symbol_asset_name }}
           tag: ${{ github.ref }}
           overwrite: true

.github/workflows/test-xmake.yml

@@ -1,42 +0,0 @@
-name: xmake
-
-on:
-  workflow_call:
-
-jobs:
-  build:
-    strategy:
-      fail-fast: false
-      matrix:
-        os: [windows-2025, ubuntu-24.04, macos-15]
-        build_type: [debug, releasedbg]
-        exclude:
-          - os: windows-2025
-            build_type: debug
-    runs-on: ${{ matrix.os }}
-    steps:
-      - name: Checkout repository
-        uses: actions/checkout@v4
-
-      - name: Setup xmake
-        uses: xmake-io/github-action-setup-xmake@v1
-        with:
-          xmake-version: 3.0.5
-          actions-cache-folder: ".xmake-cache"
-          actions-cache-key: ${{ matrix.os }}
-          package-cache: true
-          package-cache-key: ${{ matrix.os }}-pixi
-          build-cache: true
-          build-cache-key: ${{ matrix.os }}-${{ matrix.build_type }}
-
-      - uses: ./.github/actions/setup-pixi
-
-      - name: Build
-        run: pixi run xmake ${{ matrix.build_type }}
-
-      - name: Test
-        run: pixi run xmake-test
-
-      - name: Remove llvm package (Linux)
-        if: runner.os == 'Linux'
-        run: xmake require --uninstall clice-llvm