doc: Build instructions for macOS.

[laosb]

Summary by Sourcery

Documentation:

• Add build instructions for macOS to the BUILD.md file, detailing prerequisites and step-by-step guidance for development builds.

[sourcery-ai]

Reviewer's Guide by Sourcery

This PR adds a new BUILD.md file with detailed instructions for building the Rune project on macOS. The documentation includes prerequisites, step-by-step build instructions, and important notes about code signing configuration for both regular contributors and Inkwire Tech employees.

No diagrams generated as the changes look simple and do not need a visual representation.

File-Level Changes

Change	Details	Files
Added comprehensive macOS build documentation	Added prerequisites section listing Xcode and Homebrew requirements Included step-by-step instructions for repository setup and dependency installation Added special instructions for Inkwire Tech employees regarding Apple Developer Program Detailed Xcode signing configuration steps for development builds Added build and run script instructions Included warning about not committing signing configuration changes	BUILD.md

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[sourcery-ai]

Hey @laosb - I've reviewed your changes - here's some feedback:

Overall Comments:

• The clone command is missing in step 1. Please add the actual git clone command with the repository URL.
• Consider moving Inkwire Tech employee-specific instructions to internal documentation to maintain a cleaner separation between public and private documentation.

Here's what I looked at during the review

• 🟡 General issues: 1 issue found
• 🟢 Security: all looks good
• 🟢 Testing: all looks good
• 🟢 Complexity: all looks good
• 🟢 Documentation: all looks good

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[sourcery-ai]

issue: Missing repository URL or clone command

Please provide the git clone command with the repository URL to help users get started.