chore: bump Homebrew formula to v0.3.0

SHA256 hashes need updating after release artifacts are built.

Ultraworked with [Sisyphus](https://github.com/code-yeongyu/oh-my-opencode)

Co-authored-by: Sisyphus <clio-agent@sisyphuslabs.ai>

Author: Tomas Caraccia

Formula/taskboard.rb

@@ -1,7 +1,7 @@
 class Taskboard < Formula
   desc 'Local project management with Kanban UI and MCP server for AI assistants'
   homepage 'https://github.com/tcarac/taskboard'
-  version '0.2.0'
+  version '0.3.0'
   license 'MIT'
 
   on_macos do