test(install): empty-dir packed-tarball host-install proofs for the package-relative installer (#252)

[ScriptedAlchemy]

Summary

Second slice of #252, on top of #281: the empty-dir consumer proof matrix at the host-install proof level, with the packed tarball as the subject.

• The feat(test): host-install proof level with real Claude, Codex, and Cursor install proofs (#100 stage 3) #242 proof runners (runClaudeHostInstallProof / runCodexHostInstallProof / runCursorHostInstallProof) gain an injectable installCommand; the default remains the framework-CLI node dist/cli.js install <host> --from <bundle> path, byte-compatible for existing callers.
• New packed-host-install-proof.test.ts (packed pool): builds the shared host-install fixture ONCE through agent-bundle prepack (the feat(package): package-relative host installer bins and the agent-bundle prepack inventory gate (#252) #281 gate passing on a real host-pack project), with a journey-local package.json carrying files: [artifact, dist] + the generated installer bin — the checked-in fixture is untouched. One real npm pack, one npm install of the exact tarball into a verified-empty consumer, then the source project is deleted and its absence asserted before any install runs.
• Each host lane spawns the installed node_modules/.bin/host-install-proof install <host> --json — the package-relative import.meta.url resolution path, never the repo:
  • Claude (binary-gated): real plugin marketplace add + plugin install; plugin list --json row (id, version, scope, enabled, installPath in the isolated cache, mcpServers) and Skills/Hooks/MCP inventory 1/1/1.
  • Codex (binary-gated): installed+enabled registration, isolated cache tree, schema-valid agents/openai.yaml sidecar, manifest interface block.
  • Cursor (ungated): placement at .cursor/plugins/local/<name>, pinned-schema documents, ${CURSOR_PLUGIN_ROOT} unresolved, idempotent second run → already-installed.
• Installed/registered versions are asserted equal to the fixture package.json version (Package generated host packs into publishable npm plugins with a package-relative installer #252's version-agreement criterion at the installed end).
• Wiring: test:host-install:packed[:build] scripts and a packed-tarball step per matrix host in native-host-smoke.yml, mirroring feat(test): host-install proof level with real Claude, Codex, and Cursor install proofs (#100 stage 3) #242.

No production source changes, so no changeset.

Test plan

• pnpm build, pnpm typecheck, pnpm lint — green
• pnpm test:host-install:packed — 3 passed / 0 skipped / 0 failed: real Claude Code 2.1.257 and codex-cli 0.147.0 registrations plus the Cursor placement, all observed from the packed tarball with the source tree deleted
• pnpm test:host-install — 3 passed / 0 skipped (runner refactor changes nothing for feat(test): host-install proof level with real Claude, Codex, and Cursor install proofs (#100 stage 3) #242's lane)

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Latest commit: e89a878

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[chatgpt-codex-connector]

Codex Review Summary

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Review	Status	Commit	Review trigger
📝 Code Review	✅ Completed 2026-09-02T05:50:06.649901Z	e89a878	PR opened

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