Quieting PHP 8.2+ deprecated noise from older WP-CLI — three layers to keep JSON parse clean

Short summary

Older WP-CLI versions leak PHP 8.2+ deprecation warnings into JSON output, breaking parsing. The solution uses three independent defensive layers: environment-variable-based warning suppression, regex stripping of noise lines, and JSON-first parsing that validates data before exit codes. Applied across all call sites with comprehensive regression testing.

• •PHP 8.2+ deprecation warnings from old WP-CLI leak into JSON output, breaking json_decode()
• •Three defensive layers: suppress at source (WP_CLI_PHP_ARGS), strip patterns (regex), parse-first logic
• •Applied across all call sites and protected with 18 regression test cases

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