Add Homebrew (Apple Silicon) initialization to dot_zshrc

[caipira113]

Motivation

• Ensure Homebrew-installed tools are available in zsh on macOS Apple Silicon by initializing the Homebrew environment when present.

Description

• Add a conditional to dot_zshrc that checks OSTYPE for darwin* and the presence of /opt/homebrew/bin/brew and runs eval "$(/opt/homebrew/bin/brew shellenv zsh)" to set up Homebrew's environment.

Testing

• No automated tests were run.

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Codex Task

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Note

Low Risk
Small, guarded shell startup change with no auth or data handling impact; only affects macOS sessions where Homebrew is installed.

Overview
Homebrew on Apple Silicon is now initialized at the top of dot_zshrc, before the existing Nix block.

On darwin* hosts, if /opt/homebrew/bin/brew is executable, the shell runs eval "$(/opt/homebrew/bin/brew shellenv zsh)" so Homebrew’s PATH and related env vars are available in interactive zsh sessions.

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[devin-ai-integration]

✅ Devin Review: No Issues Found

Devin Review analyzed this PR and found no potential bugs to report.

View in Devin Review to see 1 additional finding.