Fix two blink false positives surfaced on rector-src

[TomasVotruba]

Running ecs check --blink on rector-src reported 840 fixable files; the PHP engine reports the codebase clean. Two independent bugs caused this.

1. Net-zero fixer runs reported with an empty diff (836 files)

UnaryOperatorSpacesFixer (full) strips the space after ! (! $a -> !$a) and NotOperatorWithSuccessorSpaceFixer adds it back. On files with ! $x, the two fight to a draw: the rendered output is identical to the original, but both rules returned changed=true, so the file was listed as fixable with an empty diff.

The runner now reports a change only when the final rendered content differs from the original, matching PHP-CS-Fixer (which reports real diffs only).

2. ClassDefinition mangled code after a keyword-named reference

The lexer tags a class name like Enum (in Enum::MODE_ADD) as the enum keyword. ClassDefinitionFixer treated it as a declaration and, with single_line: true, flattened every newline between it and the next { (a later method brace), collapsing a multi-line array and merging statements:

-            new ConstantStringType(Enum::MODE_ADD),
-            new ConstantStringType(Enum::MODE_EDIT),
-        ]);
+            new ConstantStringType(Enum::MODE_ADD), new ConstantStringType(Enum::MODE_EDIT), ]);

A genuine declaration is always followed by the type-name identifier, so a class-like keyword not followed by one (Enum::, Enum() is skipped.

Verification

Regression tests added for both (internal/runner, internal/fixer/rules). After the fix, ecs check --blink on rector-src reports no errors, matching the PHP engine.