Deprecate Constraint::CHECK_MODE_NONE

[Copilot]

Constraint::CHECK_MODE_NONE (0x00000000) has been defined since early versions but is never referenced anywhere in the codebase and has no meaningful semantic—a bitmask of zero applied to any flag check is a no-op.

Changes

• Constraint.php — Added @deprecated PHPDoc to CHECK_MODE_NONE; constant is retained to avoid a breaking change and will be removed in the next major release (7.0.0)

/** @deprecated CHECK_MODE_NONE is unused and will be removed in the next major release (7.0.0) */
public const CHECK_MODE_NONE = 0x00000000;

IDEs and static analysis tools (PHPStan, Psalm) will surface the deprecation warning at call sites.

Original prompt

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This section details on the original issue you should resolve

<issue_title>Constraint::CHECK_MODE_NONE is defined but never used</issue_title>
<issue_description>As it says on the tin: "Constraint::CHECK_MODE_NONE is defined but never used". Also what would a validator do in a check mode none?

This might require some checking and should only be removed in the next mayor release. However it could be marked as deprecated</issue_description>

Comments on the Issue (you are @copilot in this section)

• Fixes Constraint::CHECK_MODE_NONE is defined but never used #839

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