test(#1970): consolidate 61 install-suite regression tests into function suites
Fold 61 issue-named install/codex/runtime regression files into the canonical test file that owns each subject-under-test, preserving every assertion and its origin issue number as provenance (block-scoped describe wrappers, zero assertion loss — 652 subtests conserved 1:1). Routes: - codex-config.test.cjs +19 (codex config/toml/hooks/adapter/skill surface) - install.test.cjs +18 (node-runner norm, manifest, arg parse, finishInstall) - install-runtime-artifacts +13 (per-runtime conversion + emission) - install-minimal-hooks +6 (hook-event dialects + guards) - path-replacement +2 (opencode absolute pathPrefix) - install-write-confinement +2 (pristine dir writes) - install-regressions +1 (user-artifact preservation) Removes 61 tests/ files → 61 fewer CI processes. Regenerates the regression-name allowlist (271→222), ratchets the file-count allowlist (config 10→9, install 12→9), and makes 13 relocated allow-test-rule exemptions issue-ref-compliant (ADR-456; prunes 13 stale allowlist ids). Repoints ADR-0009's moved-test list. lint:ci green. Part of epic #1969. Closes #1970. Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>
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