Fix for accessibility permissions

[clarkemn]

This pull request adds new documentation and improves the handling and testing of Accessibility permissions required for launching different terminal applications from the app. The most significant changes include the addition of a developer guide, refinement of permission logic for terminal automation, and comprehensive unit tests to ensure correct behavior.

Documentation:

• Added CLAUDE.md, a detailed developer guide covering build/test commands, architecture, service responsibilities, UI patterns, and release process.

Terminal Accessibility Permissions Logic:

• Replaced the generic supportsAppleScript property with a more precise requiresSystemEventsAccess property on the TerminalService.Terminal enum, distinguishing between terminals that require Accessibility permissions (Warp, Ghostty) and those that do not (Terminal.app, iTerm2).
• Updated the requiresAccessibilityPermissions(_:) method in TerminalService to use the new property, improving clarity and correctness.

Testing:

• Added TerminalServiceTests.swift with comprehensive tests for the new permission logic, verifying which terminals require Accessibility permissions and ensuring the correct AppleScript templates are used for each terminal type.
• Registered the new test file in the package manifest to ensure it runs as part of the test suite.