opencode formula requires impossible Xcode version 26.0

Issue Description

The opencode formula has an incorrect Xcode version requirement that prevents installation.

Error Message

Error: Your Xcode (16.4) at /Applications/Xcode.app is too outdated.
Please update to Xcode 26.0 (or delete it).

Environment

• macOS
• Xcode 16.4 (Build version 16F6)
• Formula: opencode 1.1.17

Problem

The formula requires Xcode 26.0, which doesn't exist. Apple's latest Xcode version is in the 16.x range. This appears to be a bug in the formula's version check.

Expected Behavior

The formula should either:

1. Accept Xcode 16.4 (current version)
2. Have a reasonable Xcode version requirement that reflects actual Apple releases