Use major.minor PHP version in guidelines instead of full version

[oddvalue]

Description

This PR updates the PHP version output in generated guidelines and the ApplicationInfo MCP tool to use only the major and minor version (e.g. 8.4) instead of the full version including the patch number (e.g. 8.4.3).

Motivation

On teams where different members may be running slightly different patch versions of PHP (e.g. 8.4.1 vs 8.4.3), the full PHP_VERSION constant causes unnecessary churn in guideline files. Every time a team member with a different patch version runs the install command, the guideline file changes, leading to noisy diffs and constant re-generation. Since the patch version is rarely relevant to coding guidelines or API compatibility, using only the major and minor version keeps guideline files stable across the team.

Changes

• .ai/foundation.blade.php — Changed {{ PHP_VERSION }} to {{ PHP_MAJOR_VERSION }}.{{ PHP_MINOR_VERSION }}
• src/Mcp/Tools/ApplicationInfo.php — Changed PHP_VERSION to PHP_MAJOR_VERSION.'.'.PHP_MINOR_VERSION
• tests/Feature/Mcp/Tools/ApplicationInfoTest.php — Updated test assertions to match the new format

Impact

• No breaking changes — the version string format changes from 8.x.x to 8.x, which is still valid and more appropriate for guidelines
• This is consistent with how package versions are already displayed in the foundation template (using $package->majorVersion())
• All existing tests pass

[pushpak1300]

Thanks.