Small Edgecase Fix for MacOS

[jeff-hykin]

Specific mac hardware + latest clang versions require ARCHFLAGS="-arch $(uname -m)"

This PR adds those to the docs

[greptile-apps]

Greptile Overview

Greptile Summary

This PR addresses an edge case affecting specific macOS hardware configurations with recent clang versions by adding the ARCHFLAGS="-arch $(uname -m)" environment variable to the installation instructions. The change ensures the correct architecture flags are passed during compilation, preventing clang errors that some users experience.

• Added export ARCHFLAGS="-arch $(uname -m)" to the macOS dependency installation command in the support matrix table
• Included a clarifying note that ARCHFLAGS is likely optional but required on some systems to avoid clang errors

The documentation change is minimal, well-targeted, and provides helpful context about when this workaround is needed.

Confidence Score: 5/5

• This PR is safe to merge with minimal risk
• The change only modifies documentation (README.md) to add architecture flags for macOS installation. No code changes are made, and the addition helps users avoid compilation errors on specific hardware configurations. The documentation is clear and includes appropriate context about when the flag is needed.
• No files require special attention

Important Files Changed

Filename	Overview
README.md	Added ARCHFLAGS environment variable to macOS installation instructions to fix clang compilation errors on specific hardware

Sequence Diagram

sequenceDiagram
    participant User as macOS User
    participant Brew as Homebrew
    participant Shell as Shell Environment
    participant Build as Build System (clang)
    
    User->>Brew: brew install gnu-sed gcc portaudio git-lfs libjpeg-turbo python
    Brew-->>User: Dependencies installed
    User->>Shell: export ARCHFLAGS="-arch $(uname -m)"
    Shell->>Shell: Evaluate $(uname -m) to get architecture
    Shell-->>Shell: Set ARCHFLAGS (e.g., "-arch arm64" or "-arch x86_64")
    User->>Build: Install Python packages (uv pip install)
    Build->>Build: Use ARCHFLAGS during compilation
    alt ARCHFLAGS set correctly
        Build-->>User: Successful compilation
    else ARCHFLAGS not set (edge case)
        Build-->>User: clang error on specific hardware
    end

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