Add .claude-plugin/marketplace.json so Claude-plugin-compatible runtimes
(ZCODE et al.) discover gsd-core from a custom marketplace source. The
canonical version lives at plugins[0].version and tracks package.json via
the release version-sync.
Refactor scripts/sync-manifest-versions.cjs so VERSIONED_MANIFESTS entries
are {path, versionKey} dot-path descriptors (default 'version'); register
marketplace.json with versionKey 'plugins.0.version'. getByPath/setByPath
reject __proto__/constructor/prototype (prototype-pollution guard).
plugin.json / gemini-extension.json behavior is unchanged.
- tests/issue-1855-marketplace-manifest.test.cjs: schema + version-sync guard
- tests/issue-844-manifest-version-sync.test.cjs: updated for descriptor shape
- VERSIONING.md + auto-backmerge VERSION_STAMP_MANIFESTS: include marketplace.json
- docs/how-to/install-on-your-runtime.md: marketplace discovery how-to
GSD uses npm installation (npx get-shit-done-cc) only.
The plugin.json also referenced non-existent auto.md.
Closes#49
Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>
