Add lean, native plugin-install entry points so each harness's own plugin
manager can install this marketplace (mirroring obra/superpowers) — committing
only small JSON registries, not duplicated skill/agent content trees.
- Codex: committed marketplace registry (.agents/plugins/marketplace.json) +
per-plugin manifests (plugins/*/.codex-plugin/plugin.json). Entries point at
source ./plugins/<name>; Codex reads SKILL.md directly. Transformed
.codex/skills|agents stay gitignored.
- Cursor: commit the existing .cursor-plugin/ marketplace + .cursor/rules/
(these already point at source plugins/).
- Gemini: gemini-extension.json already committed (contextFileName: AGENTS.md);
transformed trees stay gitignored (install via clone + make generate).
- OpenCode: unchanged — install via `make install-opencode` (transformed tree
stays gitignored).
- CLAUDE.md is now a symlink to AGENTS.md; Claude-Code addenda moved to
docs/harnesses.md.
- CI: new step fails if `make generate-all` drifts from the committed registries.
Net new committed: ~720 KB of manifests (no skill/agent duplication). Adds
round-trip tests for the new registries + the symlink. Docs updated across
README, docs/harnesses.md, ARCHITECTURE.md, CONTRIBUTING.md, GEMINI.md,
docs/authoring.md, and the PR template.
Seth Hobson