Model Meter 1.0.0

Initial public release.

• Track Codex/OpenAI and Claude usage balances from the macOS menu bar.
• Show 5-hour and weekly usage windows with reset timing and pace markers.
• Customize menu bar providers, labels, icons, metrics, and font size.
• Claude credentials are stored in macOS Keychain.
• Includes Sparkle-based update checks for future releases.