goreleaser: fix homebrew_casks hooks structure

Philip Zeyliger and Claude created

- Change hooks.post_install to hooks.post.install per GoReleaser v2 schema
- Use system_command with args array instead of system with inline args

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

Co-Authored-By: Claude <noreply@anthropic.com>

Change summary

.goreleaser.yml | 5 +++--
1 file changed, 3 insertions(+), 2 deletions(-)

Detailed changes

.goreleaser.yml 🔗

@@ -62,5 +62,6 @@ homebrew_casks:
     homepage: https://github.com/boldsoftware/shelley
     description: "A mobile-friendly, web-based, multi-modal coding agent"
     hooks:
-      post_install: |
-        system "xattr", "-dr", "com.apple.quarantine", "#{caskroom_path}"
+      post:
+        install: |
+          system_command "/usr/bin/xattr", args: ["-dr", "com.apple.quarantine", "#{caskroom_path}"]