Simplify Claude Code Homebrew install to brew install claude-code

Homebrew resolves 'brew install claude-code' to the cask automatically,
so the --cask flag and the anthropics/claude-code tap are both
unnecessary. Drops the redundant tap step accidentally added during
the week-02 PR review and simplifies both blog sources.

Author: neuromechanist

blog/week-01-setup-guide.md

@@ -808,7 +808,7 @@ Before the next session, install [Claude Code](https://claude.ai/claude-code), t
 curl -fsSL https://claude.ai/install.sh | bash
 
 # Or via Homebrew on macOS
-brew install --cask claude-code
+brew install claude-code
 
 # Windows PowerShell
 irm https://claude.ai/install.ps1 | iex

blog/week-02-claude-code-setup.md

@@ -58,11 +58,10 @@ Native install (recommended, auto-updates):
 curl -fsSL https://claude.ai/install.sh | bash
 ```
 
-Or via [Homebrew](https://brew.sh) (first-time install needs Anthropic's tap):
+Or via [Homebrew](https://brew.sh):
 
 ```bash
-brew tap anthropics/claude-code
-brew install --cask claude-code
+brew install claude-code
 ```
 
 ### Linux