feat: rewrite spawnpoint in Go, ship as a single binary

.github/workflows/ci.yml

@@ -0,0 +1,24 @@
+name: CI
+
+on:
+  push:
+    branches: [main]
+  pull_request:
+
+jobs:
+  test:
+    strategy:
+      matrix:
+        os: [ubuntu-latest, macos-latest]
+    runs-on: ${{ matrix.os }}
+    steps:
+      - uses: actions/checkout@v4
+      - uses: actions/setup-go@v5
+        with:
+          go-version-file: go.mod
+      - run: go vet ./...
+      - run: go test ./...
+      - name: Cross-compile
+        run: |
+          GOOS=windows GOARCH=amd64 go build -o /dev/null .
+          GOOS=linux GOARCH=arm64 go build -o /dev/null .

.github/workflows/publish.yml

@@ -1,4 +1,6 @@
-name: Publish to PyPI
+# Release: GitHub release (binaries + checksums), Homebrew cask, and PyPI wheels.
+# Keep this filename: PyPI trusted publishing is bound to it.
+name: Release
 
 on:
   push:
@@ -16,12 +18,12 @@ on:
           - major
 
 jobs:
-  publish:
+  release:
     runs-on: ubuntu-latest
     environment: pypi
     permissions:
-      id-token: write
-      contents: write
+      id-token: write # PyPI trusted publishing
+      contents: write # GitHub release
     steps:
       - uses: actions/checkout@v4
         with:
@@ -48,19 +50,31 @@ jobs:
           git tag "v${{ steps.version.outputs.next }}"
           git push origin "v${{ steps.version.outputs.next }}"
 
+      - uses: actions/setup-go@v5
+        with:
+          go-version-file: go.mod
+
+      - name: Test
+        run: go test ./...
+
+      - name: GoReleaser
+        uses: goreleaser/goreleaser-action@v6
+        with:
+          version: "~> v2"
+          args: release --clean
+        env:
+          GITHUB_TOKEN: ${{ secrets.GITHUB_TOKEN }}
+          # Fine-grained PAT with contents:write on mihirgupta0900/homebrew-tap.
+          HOMEBREW_TAP_DEPLOY_KEY: ${{ secrets.HOMEBREW_TAP_DEPLOY_KEY }}
+
       - uses: actions/setup-python@v5
         with:
           python-version: "3.12"
 
-      - name: Build
-        run: pip install hatch && hatch build
+      - name: Build PyPI wheels
+        run: python scripts/build_wheels.py
 
       - name: Publish to PyPI
         uses: pypa/gh-action-pypi-publish@release/v1
-
-      - name: Create GitHub Release
-        uses: softprops/action-gh-release@v2
         with:
-          tag_name: ${{ github.event_name == 'workflow_dispatch' && format('v{0}', steps.version.outputs.next) || github.ref_name }}
-          generate_release_notes: true
-          files: dist/*
+          packages-dir: dist/wheels

.goreleaser.yaml

@@ -0,0 +1,88 @@
+# yaml-language-server: $schema=https://goreleaser.com/static/schema.json
+version: 2
+project_name: spawnpoint
+
+before:
+  hooks:
+    - go mod tidy
+
+builds:
+  # GitHub releases, Homebrew, install.sh and `sp update` self-updates.
+  - id: spawnpoint
+    main: .
+    binary: spawnpoint
+    env: [CGO_ENABLED=0]
+    goos: [darwin, linux, windows]
+    goarch: [amd64, arm64]
+    ignore:
+      - goos: windows
+        goarch: arm64
+    flags: [-trimpath]
+    ldflags:
+      - -s -w -X main.version={{ .Version }}
+
+  # Same binary, marked as installed from PyPI so `sp update` defers to
+  # pipx / uv / pip. Packed into wheels by scripts/build_wheels.py.
+  - id: pypi
+    main: .
+    binary: spawnpoint
+    env: [CGO_ENABLED=0]
+    goos: [darwin, linux, windows]
+    goarch: [amd64, arm64]
+    ignore:
+      - goos: windows
+        goarch: arm64
+    flags: [-trimpath]
+    ldflags:
+      - -s -w -X main.version={{ .Version }} -X github.com/mihirgupta0900/spawnpoint/internal/update.Channel=pypi
+
+archives:
+  - id: spawnpoint
+    ids: [spawnpoint]
+    # No version in the name, so /releases/latest/download/<name> always works.
+    name_template: "{{ .ProjectName }}_{{ .Os }}_{{ .Arch }}"
+    formats: [tar.gz]
+    format_overrides:
+      - goos: windows
+        formats: [zip]
+    files: [LICENSE, README.md]
+
+checksum:
+  name_template: checksums.txt
+
+homebrew_casks:
+  - name: spawnpoint
+    ids: [spawnpoint]
+    repository:
+      owner: mihirgupta0900
+      name: homebrew-tap
+      # Push with a deploy key scoped to the tap repo (secret HOMEBREW_TAP_DEPLOY_KEY)
+      # rather than a personal access token.
+      git:
+        url: git@github.com:mihirgupta0900/homebrew-tap.git
+        private_key: "{{ .Env.HOMEBREW_TAP_DEPLOY_KEY }}"
+    homepage: https://github.com/mihirgupta0900/spawnpoint
+    description: "One branch. Every repo. Ready to code. Multi-repo git worktree workspaces for you and your coding agents."
+    license: MIT
+    binaries: [spawnpoint]
+    custom_block: |
+      binary "spawnpoint", target: "sp"
+    hooks:
+      post:
+        # The binary isn't notarized; clear the quarantine flag so macOS runs it.
+        install: |
+          if OS.mac?
+            system_command "/usr/bin/xattr", args: ["-dr", "com.apple.quarantine", "#{staged_path}/spawnpoint"]
+          end
+
+# Local test builds: GORELEASER_CURRENT_TAG=v1.2.3 goreleaser release --snapshot --clean
+snapshot:
+  version_template: "{{ .Version }}"
+
+changelog:
+  use: github-native
+
+release:
+  github:
+    owner: mihirgupta0900
+    name: spawnpoint