test(#1975): consolidate 51 CLI + scripts-tooling regression tests into module suites
Fold 51 issue-named CLI black-box + scripts-tooling regression files into their canonical module suites (runtime-launcher-parity, worktree-safety, install-*, managed-hooks, read-guard, capability-registry, etc.), plus a NEW slash-command-namespace.test.cjs grouping the 4 slash/colon-namespace-leak invariant suites that had no canonical owner. Verbatim block-scoped describe wrappers; 427 subtests conserved 1:1. Host-env pre-check (per B2): no CLI-receiving host sets a redirecting GSD_WORKSTREAM/GSD_PROJECT value. One folded suite (bug-3668 runtime resolver) creates an extension-less PATH gsd-tools stub + bash -c; co-locating it with the host's chmodSync tripped local/no-unguarded-nonportable-exec, so it's now Windows-guarded (skip on win32) matching the host suite's own bash -c guard. Regenerates regression-name allowlist (222->182), ratchets file-count allowlist (graphify 7->6, docs entry removed), makes 26 relocated allow-test-rule exemptions issue-ref-compliant (ADR-456; prunes stale ids). Repoints 13 tests/ references across CONTEXT.md, COMMANDS.md/FEATURES.md (EN + ja/ko/pt/zh) and ADR-0002. lint:ci green. Part of epic #1969. Closes #1975. Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>
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