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Garry TanandClaude Fable 5.1
3b7a2775ee
`gstack-design-detect.ts install` is the one download gstack makes, and only after a design skill's one-time question got a yes. It fetches the engine version gstack has tested (0.1.3) for this platform from impeccable's own GitHub release, verifies it against the checksum pinned in lib/design-detect-contract.ts (all five platforms, captured from the release's .sha256 sidecars; linux-x64 equals the fixture engine), writes an egress receipt before the fetch and refuses to download when the receipt cannot be written (fail-closed; the sink is registered in the wiring test's polarity table), caps the download at 32 MB, streams with the cap enforced, writes the file only after the hash matches, and places it under ~/.impeccable/bin/<version>/ (a trusted IMPECCABLE_HOME is honored; never inside a project). No skill, no hook, no launcher, no npx. --sha256 accepts a sidecar checksum for a version gstack has not pinned; --base allows a mirror (https, or http on loopback for tests). After a successful install the probe runs and its lines follow, so the skill sees READY at once. The probe ends with DESIGN_DETECTOR_INSTALL_OFFER (version, platform, bytes, destination) whenever it found no engine and the user has not answered the question; once design_detector_install_prompted is true it prints neither the offer nor the NOT_CACHED hint, which used to repeat on every run. The hint's npx wording is corrected: `npx impeccable detect --help` caches the engine for npx only, not where the probe looks. gstack-config gains design_detector_install_prompted (true|false, typo rejected, enumerated in list and defaults). Tests: a loopback mirror (async spawn, so the in-process server can answer) covers install, re-install as a verified no-op, checksum mismatch, 404, unpinned version, non-https base, design_detector off, and IMPECCABLE_HOME inside the repo; the offer and the silenced hint; pin completeness per platform. Co-Authored-By: Claude Fable 5.1 <noreply@anthropic.com>