fix(build): ensure Homebrew path includes on Apple Silicon for cmake

[solderzzc]

Fixes #63.

The build.sh script natively struggled to resolve cmake and brew via Homebrew on Apple Silicon Macs when triggered via specific shells because /opt/homebrew/bin was not injected into the $PATH automatically. This applies a robust fix directly into the shell context.

(Note: The other root cause of Issue #63 regarding the GLM 5.1 code leakage throwing inconsistent compilation errors has already been resolved natively down the dependency tree by reverting the branch and re-aligning the clean SwiftLM submodules in main.)

[Copilot]

Pull request overview

Updates the root build script to reliably locate Homebrew-installed tooling (notably cmake/brew) on Apple Silicon by ensuring common Homebrew install locations are present in the script’s PATH.

Changes:

• Prepend /opt/homebrew/bin and /usr/local/bin to PATH at the start of build.sh.

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[Copilot]

Prepending /opt/homebrew/bin and /usr/local/bin to PATH globally can unintentionally change which swift/cmake/etc. binaries are used if the user already has custom toolchains in their existing $PATH. Consider only adding the Homebrew paths when brew/cmake aren’t found, and/or only adding directories that exist and aren’t already present in PATH (optionally include .../sbin).