Add false-positive regression coverage

[jbuncle]

Summary

• add PATCH regressions for grouped vs ungrouped type imports, grouped vs ungrouped const imports, trait alias syntax equivalence, and namespace constant reordering
• normalize single-trait alias adaptations so qualified and unqualified trait aliases compare semantically
• keep the false-positive coverage 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"