test(#1974): consolidate 27 installer/hooks remainder tests into module suites
Fold 27 issue-named installer/hooks/statusline/migration/reapply regression files into their canonical module suites (installer-migrations, installer-migration-report, gsd-statusline, reapply-verify-hunks, install-*, gsd-check-update-worker-platform-gate, etc.). Verbatim block-scoped describe wrappers; 276 subtests conserved 1:1. No new files. The one subdir origin (tests/installer-migrations/001-legacy-orphan-files) moved up one level into installer-migrations.test.cjs; its single ../../ module require corrected to ../ so it resolves from tests/ root (verified). Host-env pre-check: no CLI-receiving host sets a redirecting GSD_WORKSTREAM/GSD_PROJECT value. Regenerates regression-name allowlist (222->205), ratchets file-count allowlist (verify 11->8, validate entry removed), makes 16 relocated allow-test-rule exemptions issue-ref- compliant (ADR-456; prunes stale ids). Repoints 15 tests/ references across state-md.md (EN + ja/ko/pt/zh). lint:ci green. Part of epic #1969. Closes #1974. Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>
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