ci: add GoReleaser and GitHub Actions release workflow

- .goreleaser.yaml: builds git-explain and git-as bundle
- .github/workflows/release.yml: triggers on tag push
- Homebrew formulas will be created in HomebrewFormula/

Packages:
- git-explain: standalone
- git-as: bundles git-id, git-as, gh-as

Author: jdevera

.github/workflows/release.yml

@@ -0,0 +1,31 @@
+name: Release
+
+on:
+  push:
+    tags:
+      - 'v*'
+
+permissions:
+  contents: write
+
+jobs:
+  release:
+    runs-on: ubuntu-latest
+    steps:
+      - name: Checkout
+        uses: actions/checkout@v4
+        with:
+          fetch-depth: 0
+
+      - name: Set up Go
+        uses: actions/setup-go@v5
+        with:
+          go-version-file: go.mod
+
+      - name: Run GoReleaser
+        uses: goreleaser/goreleaser-action@v6
+        with:
+          version: latest
+          args: release --clean
+        env:
+          GITHUB_TOKEN: ${{ secrets.GITHUB_TOKEN }}

.goreleaser.yaml

@@ -0,0 +1,107 @@
+version: 2
+
+builds:
+  - id: git-explain
+    main: ./cmd/git-explain
+    binary: git-explain
+    goos:
+      - darwin
+      - linux
+    goarch:
+      - amd64
+      - arm64
+    ldflags:
+      - -s -w -X main.version={{.Version}}
+
+  - id: git-id
+    main: ./cmd/git-id
+    binary: git-id
+    goos:
+      - darwin
+      - linux
+    goarch:
+      - amd64
+      - arm64
+    ldflags:
+      - -s -w -X main.version={{.Version}}
+
+  - id: git-as
+    main: ./cmd/git-as
+    binary: git-as
+    goos:
+      - darwin
+      - linux
+    goarch:
+      - amd64
+      - arm64
+    ldflags:
+      - -s -w -X main.version={{.Version}}
+
+  - id: gh-as
+    main: ./cmd/gh-as
+    binary: gh-as
+    goos:
+      - darwin
+      - linux
+    goarch:
+      - amd64
+      - arm64
+    ldflags:
+      - -s -w -X main.version={{.Version}}
+
+archives:
+  - id: git-explain
+    builds:
+      - git-explain
+    name_template: "git-explain_{{ .Version }}_{{ .Os }}_{{ .Arch }}"
+    format: tar.gz
+
+  - id: git-as-bundle
+    builds:
+      - git-id
+      - git-as
+      - gh-as
+    name_template: "git-as_{{ .Version }}_{{ .Os }}_{{ .Arch }}"
+    format: tar.gz
+
+checksum:
+  name_template: 'checksums.txt'
+
+changelog:
+  sort: asc
+  filters:
+    exclude:
+      - '^docs:'
+      - '^chore:'
+      - '^test:'
+
+brews:
+  - name: git-explain
+    ids:
+      - git-explain
+    repository:
+      owner: jdevera
+      name: git-this-bread
+      branch: main
+    directory: HomebrewFormula
+    homepage: https://github.com/jdevera/git-this-bread
+    description: See your contribution status across git repositories
+    license: MIT
+    install: |
+      bin.install "git-explain"
+
+  - name: git-as
+    ids:
+      - git-as-bundle
+    repository:
+      owner: jdevera
+      name: git-this-bread
+      branch: main
+    directory: HomebrewFormula
+    homepage: https://github.com/jdevera/git-this-bread
+    description: Identity switching for git and GitHub CLI
+    license: MIT
+    install: |
+      bin.install "git-id"
+      bin.install "git-as"
+      bin.install "gh-as"

AGENTS.md

@@ -10,10 +10,20 @@ mise run test     # unit tests
 mise run lint     # golangci-lint
 ```
 
-## Tools
+## Packages
 
-- cmd/git-explain — repo status analyzer (see cmd/git-explain/CLAUDE.md)
-- cmd/git-id, cmd/git-as, cmd/gh-as — identity switching (see cmd/git-id/CLAUDE.md)
+- git-explain — repo status analyzer (see cmd/git-explain/AGENTS.md)
+- git-as — identity tools bundle: git-id, git-as, gh-as (see cmd/git-id/AGENTS.md)
+
+## Releases
+
+GoReleaser builds binaries and Homebrew formulas on tag push:
+
+```
+git tag v1.0.0 && git push --tags
+```
+
+Formulas go to `HomebrewFormula/` in this repo.
 
 ## Test Helpers