refactor(release): simplify pre-release channel to nightly only

Drops `alpha` / `beta` / `rc` as accepted pre-release labels in
bin/dev/release.sh. `nightly` is now the only pre-release descriptor,
in preparation for automated nightly tags.

Renames the Homebrew tap formula from `fabro-beta` to `fabro-nightly`:

- installer/fabro-beta.rb.template -> installer/fabro-nightly.rb.template
  (class renamed FabroBeta -> FabroNightly, desc updated).
- `update-homebrew-beta` job in release.yml is now
  `update-homebrew-nightly` with matching file paths and commit message.

Breaking for existing `brew install fabro-sh/tap/fabro-beta` users: the
old formula file stays in the tap for now (removed in a follow-up once
fabro-nightly is populated) and stops receiving updates. Users should
switch to `brew install fabro-sh/tap/fabro-nightly` once the new
formula is published by the next pre-release tag.

Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>

.github/workflows/release.yml

@@ -146,8 +146,8 @@ jobs:
           git add Formula/fabro.rb
           git diff --cached --quiet || (git commit -m "Update fabro to ${TAG_NAME}" && git push)
 
-  update-homebrew-beta:
-    name: Update Homebrew Beta Formula
+  update-homebrew-nightly:
+    name: Update Homebrew Nightly Formula
     needs: release
     if: ${{ contains(github.ref_name, '-') }}
     runs-on: ubuntu-latest
@@ -165,7 +165,7 @@ jobs:
           pattern: artifacts-fabro-*
           merge-multiple: true
 
-      - name: Generate and push beta formula
+      - name: Generate and push nightly formula
         env:
           GH_TOKEN: ${{ secrets.HOMEBREW_TAP_TOKEN }}
           TAG_NAME: ${{ github.ref_name }}
@@ -181,12 +181,12 @@ jobs:
             -e "s/{{SHA_AARCH64_DARWIN}}/$SHA_AARCH64_DARWIN/g" \
             -e "s/{{SHA_X86_64_LINUX}}/$SHA_X86_64_LINUX/g" \
             -e "s/{{SHA_AARCH64_LINUX}}/$SHA_AARCH64_LINUX/g" \
-            installer/fabro-beta.rb.template > fabro-beta.rb
+            installer/fabro-nightly.rb.template > fabro-nightly.rb
 
           git clone https://x-access-token:${GH_TOKEN}@github.com/fabro-sh/homebrew-tap.git tap
-          cp fabro-beta.rb tap/Formula/fabro-beta.rb
+          cp fabro-nightly.rb tap/Formula/fabro-nightly.rb
           cd tap
           git config user.name "github-actions[bot]"
           git config user.email "github-actions[bot]@users.noreply.github.com"
-          git add Formula/fabro-beta.rb
-          git diff --cached --quiet || (git commit -m "Update fabro-beta to ${TAG_NAME}" && git push)
+          git add Formula/fabro-nightly.rb
+          git diff --cached --quiet || (git commit -m "Update fabro-nightly to ${TAG_NAME}" && git push)

bin/dev/release.sh

@@ -34,9 +34,9 @@ next_base_version() {
 validate_prerelease_label() {
   local label="$1"
   case "$label" in
-    alpha|beta|rc) ;;
+    nightly) ;;
     *)
-      die "invalid pre-release label: $label (expected one of: alpha, beta, rc)"
+      die "invalid pre-release label: $label (expected: nightly)"
       ;;
   esac
 }
@@ -73,7 +73,7 @@ parse_args() {
         ;;
       --help|-h)
         cat <<'EOF'
-Usage: bin/dev/release.sh [alpha|beta|rc] [--dry-run] [--skip-tests]
+Usage: bin/dev/release.sh [nightly] [--dry-run] [--skip-tests]
 
 Create the next stable release from main, or compute a prerelease tag.
 

installer/fabro-nightly.rb.template

@@ -1,5 +1,5 @@
-class FabroBeta < Formula
-  desc "Unified CLI for the Fabro AI framework (pre-release channel)"
+class FabroNightly < Formula
+  desc "Unified CLI for the Fabro AI framework (nightly channel)"
   homepage "https://fabro.sh"
   license "MIT"
   version "{{VERSION}}"