Revert to brews (Formula) — casks cause Gatekeeper quarantine

Casks trigger macOS quarantine warnings for unsigned binaries.
Formulas don't have this issue. The brews deprecation is just a
warning, not a blocker.

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

Author: nicksenap

README.md

@@ -19,7 +19,7 @@ Grove gives you the multi-repo worktree workflow that monorepos get for free. On
 ### Homebrew (Go — recommended)
 
 ```bash
-brew install --cask nicksenap/grove/grove-go
+brew install nicksenap/grove/grove-go
 ```
 
 ### Homebrew (Python)
@@ -46,13 +46,13 @@ If you have the Python version installed via Homebrew, uninstall it first — bo
 
 ```bash
 brew uninstall grove
-brew install --cask nicksenap/grove/grove-go
+brew install nicksenap/grove/grove-go
 ```
 
 ### Upgrading
 
 ```bash
-brew upgrade --cask nicksenap/grove/grove-go
+brew upgrade nicksenap/grove/grove-go
 ```
 
 Then add shell integration to your `.zshrc` (or `.bashrc`):

go/.goreleaser.yml

@@ -34,14 +34,17 @@ changelog:
       - "^test:"
       - "^ci:"
 
-homebrew_casks:
+brews:
   - name: grove-go
     repository:
       owner: nicksenap
       name: homebrew-grove
       token: "{{ .Env.TAP_GITHUB_TOKEN }}"
-    directory: Casks
+    directory: Formula
     homepage: https://github.com/nicksenap/grove
     description: "Git Worktree Workspace Orchestrator (Go)"
-    binaries:
-      - gw
+    license: MIT
+    install: |
+      bin.install "gw"
+    test: |
+      assert_match version.to_s, shell_output("#{bin}/gw --version")