Split ParamReturnAndVarTagMalformsFixer into single-task doc block rules

[TomasVotruba]

Split ParamReturnAndVarTagMalformsFixer into single-task rules

The all-in-one ParamReturnAndVarTagMalformsFixer mixed ~10 unrelated doc-block fixes behind one rule. This splits it into focused, single-task rules — each fixes one kind of @param/@return/@var malform, so they can be enabled, skipped and reasoned about individually.

• shared token traversal lives in a new AbstractDocBlockFixer base; each rule only implements its own processDocContent()
• the old MalformWorker classes + MalformWorkerInterface are removed (logic inlined into the rules)
• ParamReturnAndVarTagMalformsFixer is kept as a deprecated, empty rule implementing DeprecatedFixerInterface, pointing at its successors
• all rules registered together in a new config/sets/docblock.php set, imported from config/symplify.php
• all rules handle the @phpstan- and @psalm- prefixed tag variants

New rules

AddMissingParamNameFixer — add a missing variable name to a @param

 /**
- * @param string
+ * @param string $name
  */
 function getPerson($name)
 {
 }

AddMissingVarNameFixer — add a missing variable name to an inline @var

-/** @var int */
+/** @var int $value */
 $value = 1000;

DoubleAsteriskInlineVarFixer — use a /** doc block for an inline @var comment

-/* @var int $variable */
+/** @var int $variable */
 $variable = 5;

FixParamNameTypoFixer — fix a typo in the @param name to match the real argument

 /**
  * @param string $one
- * @param string $twoTypo
+ * @param string $two
  */
 function anotherFunction(string $one, string $two)
 {
 }

RemoveDeadParamFixer — remove a dead @param line that has only a name and no type

 /**
  * @param string $name
- * @param $age
  */
 function withDeadParam(string $name, $age)
 {
 }

RemoveParamNameReferenceFixer — remove the reference & from a @param name

 /**
- * @param string &$name
+ * @param string $name
  */
 function paramReference($name)
 {
 }

RemoveSuperfluousReturnNameFixer — remove a superfluous variable name from @return

 /**
- * @return int $value
+ * @return int
  */
 function function1(): int
 {
 }

RemoveSuperfluousVarNameFixer — remove a superfluous variable name from a property @var

 /**
- * @var string $property
+ * @var string
  */
 private $property;

SingleLineInlineVarDocBlockFixer — collapse a multi-line inline @var doc block into one line

-/**
- * @var int $value
- */
+/** @var int $value */
 $value = 1000;

SwitchedTypeAndNameFixer — reorder switched type and variable name

 /**
- * @param $a string
- * @param $b string|null
+ * @param string $a
+ * @param string|null $b
  */
 function test($a, string $b = null): string
 {
 }

Tests

• each rule gets its own tests/Fixer/Commenting/<Fixer>/ dir (test + isolated fixtures, moved via git mv)
• combined/interplay/skip fixtures moved to a new tests/Set/DocblockSet/ integration test that runs the whole docblock set, so no coverage is lost

Verification

ECS, Rector (dry-run), PHPStan and the full PHPUnit suite (160 tests) all pass.