Add PipeOperatorSpacingSniff for PHP 8.5 pipe operator

[dereuromark]

Summary

• Adds support for PHP 8.5 pipe operator (|>)
• Implements PipeOperatorSpacingSniff to enforce consistent spacing
• All violations are auto-fixable

Changes

• Created PhpCollective\Sniffs\WhiteSpace\PipeOperatorSpacingSniff
• Added comprehensive test coverage
• Sniff enforces:
  • No space between | and >
  • Exactly one space before the pipe operator
  • Exactly one space after the pipe operator

Example

Before

$result = $input|>trim(...)|>strtolower(...);
$result = $input  |>  trim(...);

After

$result = $input |> trim(...) |> strtolower(...);
$result = $input |> trim(...);

Test Plan

• Unit tests pass (10 errors detected and fixed)
• Code style checks pass
• Full test suite passes (84 tests)
• Tested against PHP 8.5 pipe operator syntax

🤖 Generated with Claude Code