🤖 Add Codex marketplace metadata

README.md

@@ -47,6 +47,26 @@ From a local clone:
 
 Each plugin's own README documents its skills and any per-plugin install paths.
 
+## Install as a Codex marketplace
+
+Reliquary also publishes Codex-native plugin metadata via `.agents/plugins/marketplace.json` and per-plugin `.codex-plugin/plugin.json` manifests.
+
+From the git marketplace:
+
+```sh
+codex plugin marketplace add git@git.g4b.org:dirigence/reliquary.git
+codex plugin add g4b_ai@reliquary
+```
+
+From a local clone:
+
+```sh
+codex plugin marketplace add /path/to/reliquary
+codex plugin add g4b_ai@reliquary
+```
+
+A project can mirror the checked-in `.codex/config.toml` shape to prefer Codex-native marketplace and plugin declarations.
+
 ## ✂️ Grab pieces independently
 
 A skill is just a folder containing `SKILL.md`. You don't need the plugin or marketplace machinery to use one:
@@ -67,6 +87,11 @@ ln -s /tmp/reliquary/plugins/g4b_ai/skills/workpad ~/.claude/skills/workpad
 
 ```
 reliquary/
+├── .agents/
+│   └── plugins/
+│       └── marketplace.json       # Codex marketplace listing
+├── .codex/
+│   └── config.toml                # Codex project plugin setup example
 ├── .claude-plugin/
 │   └── marketplace.json          # the marketplace listing
 ├── plugins/