Add declaration-shape false-positive regressions

[jbuncle]

Summary

• add PATCH regressions for renamed parent aliases, grouped vs ungrouped contract imports, reordered plain trait-use lists, and split vs grouped namespace constant declarations
• normalise plain trait-use identity ordering so identical trait sets compare semantically instead of by source order
• keep the new no-op cases in the manual suite and coverage run

Validation

• udocker run -v /data/data/com.termux/files/home/projects/jbuncle/php-autosemver:/app -w /app composer2 sh -lc "find src bin tests -type f -name '*.php' -print0 | xargs -0 -n1 php -l && COVERAGE_MIN=90 COVERAGE_JSON=/tmp/coverage.json COVERAGE_SUMMARY=/tmp/coverage-summary.md phpdbg -qrr tests/coverage.php"