Release 3.2.0 editable validation and strict mutation authorization

[arm092]

Summary

• validate editable column mutations with Laravel rules
• add optional strict policy enforcement for built-in edit/delete actions
• document the 3.2.0 security controls
• stop tracking PHPUnit result cache

Verification

• PHP 8.4 / PHPUnit: 77 tests, 290 assertions
• composer validate --strict
• composer audit --locked

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