Split EAPIL skills into selectable plugins

Constraint: Codex installs and removes plugin units, not individual SKILL.md files.\nRejected: Keep every skill in one eapil-skills bundle | Users could not selectively install only the needed skill pack.\nConfidence: high\nScope-risk: moderate\nDirective: Add future skills as separate eapil-* plugins unless they are intentionally bundled.\nTested: python json.tool for marketplace and plugin manifests; validate_plugin.py for all 13 plugins; codex plugin marketplace add . --json; codex plugin list --marketplace eapil-skill-market --available --json; codex plugin add eapil-pdf/eapil-xlsx/eapil-threejs-fundamentals.\nNot-tested: Remote Git marketplace refresh after push.

README.md

@@ -10,7 +10,7 @@ In **Add plugin marketplace**:
 - Git ref: `main`
 - Sparse path: leave empty
 
-After the marketplace is added, install `eapil-skills` from the `EAPIL Skill Market` marketplace.
+After the marketplace is added, install only the plugin you need from the `EAPIL Skill Market` marketplace.
 
 If you want to use sparse checkout, enter both paths if the UI allows multiple lines:
 
@@ -23,38 +23,66 @@ plugins/codex
 
 ```powershell
 codex plugin marketplace add https://git.playones.com/arechen/EapilSkillMarket.git --ref main
-codex plugin add eapil-skills@eapil-skill-market
+codex plugin add eapil-pdf@eapil-skill-market
 ```
 
 Sparse CLI form:
 
 ```powershell
 codex plugin marketplace add https://git.playones.com/arechen/EapilSkillMarket.git --ref main --sparse .agents --sparse plugins/codex
-codex plugin add eapil-skills@eapil-skill-market
+codex plugin add eapil-xlsx@eapil-skill-market
 ```
 
 For local testing before pushing:
 
 ```powershell
 codex plugin marketplace add .
-codex plugin add eapil-skills@eapil-skill-market
+codex plugin add eapil-pptx@eapil-skill-market
 ```
 
 Start a new Codex thread after installing so the new skills are loaded into context.
 
+## Plugins
+
+- `eapil-pdf`
+- `eapil-pptx`
+- `eapil-xlsx`
+- `eapil-threejs-animation`
+- `eapil-threejs-fundamentals`
+- `eapil-threejs-geometry`
+- `eapil-threejs-interaction`
+- `eapil-threejs-lighting`
+- `eapil-threejs-loaders`
+- `eapil-threejs-materials`
+- `eapil-threejs-postprocessing`
+- `eapil-threejs-shaders`
+- `eapil-threejs-textures`
+
+List available plugins:
+
+```powershell
+codex plugin list --marketplace eapil-skill-market --available
+```
+
+Remove an installed plugin:
+
+```powershell
+codex plugin remove eapil-pdf@eapil-skill-market
+```
+
 ## Layout
 
 ```text
 .agents/plugins/marketplace.json
 plugins/codex/
   .agents/plugins/marketplace.json
-  plugins/eapil-skills/
+  plugins/eapil-pdf/
     .codex-plugin/plugin.json
-    skills/
-      pdf/
-      pptx/
-      xlsx/
-      threejs-animation/
-      threejs-fundamentals/
-      ...
+    skills/pdf/
+  plugins/eapil-xlsx/
+    .codex-plugin/plugin.json
+    skills/xlsx/
+  plugins/eapil-threejs-fundamentals/
+    .codex-plugin/plugin.json
+    skills/threejs-fundamentals/
 ```