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>

scripts/lint-regression-test-names.allowlist.json

@@ -1,42 +1 @@
-[
-  "bug-131-release-tarball-smoke-explicit-home.test.cjs",
-  "bug-1367-claude-local-flat-command-layout.test.cjs",
-  "bug-1834-sh-hooks-installed.test.cjs",
-  "bug-1974-context-exhaustion-record.test.cjs",
-  "bug-211-launcher-home-fallback.test.cjs",
-  "bug-2136-sh-hook-version.test.cjs",
-  "bug-2344-read-guard-claudecode-env.test.cjs",
-  "bug-2451-context-monitor-over-report.test.cjs",
-  "bug-2520-read-guard-hook-subprocess-env.test.cjs",
-  "bug-2543-gsd-slash-namespace.test.cjs",
-  "bug-260-worktree-path-guard.test.cjs",
-  "bug-261-worktree-force-add-guard.test.cjs",
-  "bug-2772-gitmodules-path-intersection.test.cjs",
-  "bug-2808-skill-hyphen-name.test.cjs",
-  "bug-2916-handle-branching-default-base.test.cjs",
-  "bug-2995-post-install-script-paths.test.cjs",
-  "bug-3019-help-passthrough.test.cjs",
-  "bug-3442-shim-projection-drift-guard.test.cjs",
-  "bug-3446-resume-continue-here-discovery.test.cjs",
-  "bug-3491-nested-git-worktree.test.cjs",
-  "bug-3509-path-spaces.test.cjs",
-  "bug-3523-cjs-loadconfig-branching-strategy-warning.test.cjs",
-  "bug-3542-executor-git-stash-prohibition.test.cjs",
-  "bug-3588-npm-audit-clean.test.cjs",
-  "bug-3668-workflow-runtime-resolution.test.cjs",
-  "bug-3677-agent-colon-namespace-leak.test.cjs",
-  "bug-3678-executor-commit-docs-respect.test.cjs",
-  "bug-3683-command-colon-namespace-leak.test.cjs",
-  "bug-3683-workflow-colon-namespace-leak.test.cjs",
-  "bug-3689-resume-glob-nomatch.test.cjs",
-  "bug-444-resolver-local-claude-install.test.cjs",
-  "bug-619-codebase-drift-gate-shim.test.cjs",
-  "bug-622-graphify-optional-graph-html.test.cjs",
-  "bug-630-wave-cleanup-orchestrator-root.test.cjs",
-  "bug-641-files-from-suite-token.test.cjs",
-  "bug-685-windowshide-spawn.test.cjs",
-  "bug-891-non-claude-runtime-home-fallback.test.cjs",
-  "bug-925-context-monitor-hook-event-name.test.cjs",
-  "bug-941-managed-hooks-registry-manifest.test.cjs",
-  "bug-969-test-infra-flake-hardening.test.cjs"
-]
+[]