Publish current skill market snapshot

Constraint: Codex plugin selectors require ASCII plugin ids; Chinese names belong in display metadata.

Rejected: Keep Chinese plugin id | Codex skips it in plugin list and cannot parse plugin add selectors.

Confidence: high

Scope-risk: moderate

Directive: Reject non-ASCII marketplace plugin ids and keep README/plugin metadata synchronized.

Tested: python scripts/validate_marketplace.py; validate_plugin.py patent-application-drafting-skill; temp CODEX_HOME plugin list/add patent-application-drafting-skill; README coverage check.

Not-tested: Codex model-level skill invocation.

plugins/codex/README.md

@@ -0,0 +1,24 @@
+# Codex Marketplace Sparse Entry
+
+This directory is the sparse checkout entry for the EAPIL Codex Plugin Marketplace. AI agents should normally install the marketplace from the repository root URL:
+
+```bash
+codex plugin marketplace add https://git.playones.com/arechen/EapilSkillMarket.git --ref main
+codex plugin list --marketplace eapil-skill-market
+codex plugin add <plugin-name>@eapil-skill-market
+```
+
+Use sparse checkout only when the environment needs a smaller checkout:
+
+```bash
+codex plugin marketplace add https://git.playones.com/arechen/EapilSkillMarket.git --ref main --sparse .agents --sparse plugins/codex
+```
+
+Local debug from the repository root:
+
+```bash
+codex plugin marketplace add .
+codex plugin add docx@eapil-skill-market
+```
+
+Each `plugins/<plugin-name>` directory is an installable Codex plugin. Plugins can include plain skills plus official Codex plugin components such as `hooks`, `.mcp.json`, and `.app.json`. See the root `README.md` for the full plugin table and maintenance rules.